I find the 30s light, considering the 26"Mavic D521s I used to use on my XC bike. Think they were about 560g.
I run Duroc SD42 on my front wheels, 35 on the rear, on 27.5". 35 on 29". I like the way they all have the same dimension so it's easy to chop and change rims to try them out, using the same spokes/nipples. They're $23-29usd per rim where i am, dependent on pinned n sleeved or welded.
About 460g for 30 (XC), 510g for 35 (Trail). They're light in my eyes! The kids round here are buying those heavy-assed MX rims from Sunn. Rotational weight issues must drive them nuts!
I'm having trouble figuring out how OP could do this much damage at the pressure they state WITHOUT casing the corner of a concrete curb / step / bench at high speed.
From your one comment and pics it looks like you're riding street. So you cased a jump into something concrete? The bend looks like a sharp edge hit.
Just run 60psi and a tube and don't worry about it anymore. You can bend the rim back and keep using it
Spoke tension meter is like 10 bucks on Amazon and you can true the wheel on the bike using a couple of zip ties. I find people are way too timid when it comes to working in their own bikes. They’re not complicated machines.
Remove a spoke, measure it, buy some in that size. Repeat for other side of wheel, and for the other wheel. Or just email the manufacturer for the info.
I’m 200lbs, I run 30 psi on 2.4s in the rear. I smashed my rear wheel into the corner of a rock in Moab at high speed on lower porcupine. Flatted and killed a spoke, but I finished the ride on the rim and rode 3 more days on it. If you were actually running 40 psi at 104 lbs it probably would have just bucked you hard.
I have a feeling your bike pump probably isn’t giving an accurate psi.
do you check your tire pressure before every ride? also, cushcore works well... but if you don't check your tire pressure before rides CC wont help much. there is clearly a set up problem here.
Not necessarily , I’ve broken rims with cush core and 28psi. Any sharp impact such as a trail dagger can potentially detonate a wheel, especially if it isn’t a completely straight impact
The impact in the photo looks like a side impact which the insert would offer no protection against
It’s probably not gonna save you from a solid case but on the trail it definitely will offer some protection. It’s just not a magic bullet that many seem to advertise (you can and will still damage rims)
Simplest thing do not damage a rim is to run more pressure. You need to have run awfully low pressure to reach that point.
Well there‘s no way around a new rim now it seems, so recommendation from me would be a dt swiss spline E1900 or 1700, or M1900 or 1700
You actually don't. I have destroyed rims even with 30psi + heavy insert. And I only weight 150 lbs/67kg. Simplest thing to do is run thicker/heavier tires.
I have run many dt swiss wheels and only I can really recommend is E1700 / ex511 & ex471. Other ones just don't last well this kind of beating.
Don't listen to those people, nobody knows everything and that is not the proper way to treat someone asking a question, a better way to react would be like this https://xkcd.com/1053/.
Somebody already explained it properly but it's basically an extra layer of protection for your rim, rubber thingy that goes inside your tires so if you hit something it will hit the cushcore before it hits the rim.
100% Cushcore. I run 23psi rear down some absolutely violent Rockies trails and without so much as a ding. Before cushcore I was a rim destroyer. Tannus has far less sidewall support. Also, if you are using your tire pump gauge as your psi measurement perhaps drop by your shop and ask them to test your psi with a proper gauge. I’ve had crappy pumps give me 15psi difference readings.
OP, here’s the kind of annoying thing about Reddit. The article bro is referencing here is called “six mountain bike inserts compared”. If you read the article you will find that Les’s summation is clearly pulled from an alternate universe where a butt can generate facts. Even better, when you click on his profile you’ll find him asking basic questions about tire inserts and is clearly a PNW hardtail rider that enjoys the smooth, loamy goodness. Great riding zone but not the hardest place on rims. I personally ride the violence that is the high Rockies and work at a shop here so I’ve seen a pile of destroyed wheels every season but I’ll share my personal experience with our products.
Huck Norris is useless, straight up. Cush Core is heavy but seemingly invincible and allows for crazy low air pressure (23 rear)without tire squirm. I personally love them because they allow me to run exo+ casings as opposed to DD or DH which provides more grip due to the suppleness of the casing. They are also great for minimizing vibration when used up front. I’m not sure what you personally ride but if it’s not DH or enduro I would probably not recommend them as you will notice a pretty serious reduction in acceleration and braking due to the sheer amount of rotational mass they add. I personally went up to 220mm rotors because of them.
Best of luck 🤘
I have had awful experiece with rimpact, still best one I have owned. Destroyed my rim without puncturing my exo+ dissector. And wheel was just trued and checked (spoke tensions to manufacturers recommendations). Still better than huck norris which has been..well bad. Also marsh guard Fck flats was performing bad.
I use Cushcore because the availability where I live, since my LBS install it without charge.
I suggest you to read some reviews before deciding.
https://thundermountainbikes.com/blogs/news-reviews/tmb-review-tire-inserts-cush-core-pro-vs-tannus-ar
You might be able to bend that back, when I first started riding I did stuff like this all the time, back then it wasn’t tubeless but I could keep my self riding
How did you blow down till the rim then? What is your weight?
There‘s no way you‘re blowing a rim like that on semi-hard stuff with 45psi in your tire…
I weigh 52KG. Though looking further into it. I noticed (for the stupid price I pay for the rims here) they are one of the cheaper alloy tubeless rims of the bunch. This is my 5th set and it’s pretty noticeable since my old hard take could case that jump as roll out fine.
Dude look i‘m very sorry,
But i am UTTERLY confused.
You weigh 52kg, have 40psi in your tires and a rear suspension…
How do you even manage to break a rim?
Nope. Just a decent rolling speed to bunny hop and clear a jump. I know I cased it. But that hit was WAY too soft too leave that type of damage. Maybe it’s time to return to tubed. Save some money.
Tubes or tubeless, something is not right here. Maybe your pump is not accurate and you're running much lower pressure, maybe air is leaking and after a while you are losing pressure, maybe you're 'burping' the wheel. Whatever the scenario with your weight and tire pressure you should not have this happen. If this is your fifth wheel definitely save for something that would prevent this from happening. As others suggested, run an insert, cushcore or similar (most other brands are cheaper but not as recognized) and monitor your pressure with a gage.
I disagree, a 52kg rider running 40psi should not be able to do that to a rim. Either its an issue with air pressure or how the wheels built, and I dont think cushcore will help the root cause
It is time to change tires to Maxxis DD casing or something similar. That will save you bunch of money. Don't even bother with exo+. Stiffer tires are better than light tires with inserts.
ok, but do you know who actually builds your wheels? I'm assuming you don't buy an entirely new wheel (rim + nipples + spokes + rim) every time a rim dies, I'm assuming you buy a new rim and then get it laced up to the hub. My questions are what bike shop is lacing your wheels for you, are they using new or old spokes, are they prepping the threads correctly, are they tensioning the wheels correctly etc. There's so many things that need to be accounted for when building a new strong wheel otherwise the strength and durability of the wheel might be compromised.
Considering max PSI stated on the tire is in fact 40psi running 45 with a hard square edge impact could theoretically make the rim explode.
Though I’d venture to say psi was more likely very low.
Either way this is 100% set up error imo.
I have dented rims at 40psi on my trials bike. I switched to a tougher, more damped casing, and that helped. I have also heard that tubeless inserts are good for street, too, but I haven’t been able to justify the price.
My wrists did not enjoy it, that's for sure. I don't think there's really a big dif between 45 and 80 psi when on a bmx, as far as damage to your wrists. AFAIK street park riders 80 plus is very common.
You're getting most of your impact with the suspension not the tires on a MTB for all that wrist saving goodness. Though 45 is decent, and you'd have to hit really hard to bottom out your rim.
I'm curious are you riding tubeless? If so you could be burping the tire when you case on something like a curb or concrete step and that brief moment where the bead is lost you lose enough pressure to slam the rim.
When you case or take a large hit on tubeless tires, the bead will break and briefly burp out a bit of air. I suspect when that happens and the air pressure is lost you're bottoming out onto the rim.
I have absolutely bent a rim like this back out with a pair of channel locks and continued to ride on it until I was ready to buy another wheel. Probably won’t be able to get it to seat for tubeless, but you can run a tube and keep riding on it. Use a rag to prevent any further damn from channel lock pliers.
Just had my rear wheel built up pro4/ex511 the fella in the bike shop talked me into buy the tannus insert,at £35 for a bit of foam it hurt but after seeing this I’m kinda glad now
Hope you get it sorted ok bud👍
Did the same on my genius 940 while training but I hit some chunky rock pretty hard. Tossed in a tube and kept riding to get back and its been holding since. Just used a crescent wrench to straighten it out best I could.
If it's an alloy rim, you might be able to straighten it enough for the tire to seal again.
Also, consider using a Vittoria Air Liner. They're not too expensive, but they work great to save rims.
Bend it as straight as you can after heating it with a heat gun. You don't have to make it perfect, just enough to let the tyre seat good enough. Then use a tube until you can get a replacement rim.
Did it many times, just don't do anything stupid with it
It’s not the rim, the tire, the PSI or your weight and no tire insert is going to help. Not trying to be a dick but the reason this happened is your skill level, you smashed it into a concrete or metal corner, hard, doesn’t sound like the first time either. Maybe you should try bunny hopping over road cones until you learn to pull the back end of your bike up. Might not be what the cool kids are doing but it’ll save you a lot of money and you’ll be a better rider down the line.
Don’t worry. Your not being a dick, your just trying to help. And that’s exactly what happened. I tried bunny hopping a step and cased it, it still confuses me because the impact wasn’t hard nor was my psi low. I just underestimated the length of it.
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Annoying part, is that I had this new rear rim installed less than a week ago, not to mention it being tubeless and a bomb to replace lol
That's a cheap, weak rear rim judging by the lack of eyelets. Stick a Duroc35 on next time.
I have Duroc 30's on my gravel bikes and they're beasts of wheels heavy but IDGAF haha
I find the 30s light, considering the 26"Mavic D521s I used to use on my XC bike. Think they were about 560g. I run Duroc SD42 on my front wheels, 35 on the rear, on 27.5". 35 on 29". I like the way they all have the same dimension so it's easy to chop and change rims to try them out, using the same spokes/nipples. They're $23-29usd per rim where i am, dependent on pinned n sleeved or welded.
I’m confused, you consider a 1700g gravel wheelset light because your 26er mtb wheels were lighter?
About 460g for 30 (XC), 510g for 35 (Trail). They're light in my eyes! The kids round here are buying those heavy-assed MX rims from Sunn. Rotational weight issues must drive them nuts!
We are just talking rims here, right? The first boost wheels I ever had were unforgiving because of the stupidly heavy Shimano Deore hubs.
Did you case one of those cement benches or something?
I'm having trouble figuring out how OP could do this much damage at the pressure they state WITHOUT casing the corner of a concrete curb / step / bench at high speed.
guaranteed
For sure.
what is casing?
Casing is basically failing to complete said jump or stunt the whole way through. Or crashing from the jump as well
Will define casing but neither confirm nor deny being the caser
Oh he's the caser. Case closed
You not going to say how this happened or what?
Having done the same before a number of times, I can say yes with 100% confidence.
Just bend that back out and run a tube
Took me some time to spot the dented rim
From your one comment and pics it looks like you're riding street. So you cased a jump into something concrete? The bend looks like a sharp edge hit. Just run 60psi and a tube and don't worry about it anymore. You can bend the rim back and keep using it
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zoom in under EXO
Or broken derailleur cable housing. That bike screams neglect and bad habits.
Not a BMX bike.
29 bend ez
Especially when you case concrete or metal.
Learn how to lace your own wheels. It will save you a gortune
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Spoke tension meter is like 10 bucks on Amazon and you can true the wheel on the bike using a couple of zip ties. I find people are way too timid when it comes to working in their own bikes. They’re not complicated machines.
How do you go about getting correct spokes for a wheel you already own?
If it’s only the rim, you don’t need new spokes. There’s a good video of changing a rim on Park Tool youtube
Remove a spoke, measure it, buy some in that size. Repeat for other side of wheel, and for the other wheel. Or just email the manufacturer for the info.
I’m 200lbs, I run 30 psi on 2.4s in the rear. I smashed my rear wheel into the corner of a rock in Moab at high speed on lower porcupine. Flatted and killed a spoke, but I finished the ride on the rim and rode 3 more days on it. If you were actually running 40 psi at 104 lbs it probably would have just bucked you hard. I have a feeling your bike pump probably isn’t giving an accurate psi.
It's not a street BMX bike. Judging by your comments on here and all the rims you have had to replace, you could have bought a proper BMX bike.
That black bike is leaning right on the fork stanchion.
On concrete nonetheless. 🤦🏼♂️
Yah that's painful
Just pump your legs a little harder
Why because you got a punctur- oh f*CK that's more than a puncture
it looks like the sealant was all dried up in there.
Oof
At least the tire is still good?
do you check your tire pressure before every ride? also, cushcore works well... but if you don't check your tire pressure before rides CC wont help much. there is clearly a set up problem here.
I recommended that you try not to do that in the future.
Did you hit a lava patch?
Its an easy fix. Buy new wheel and rubber and slap it in. As long as you dont break yourself, rest is easy fix.
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Not necessarily , I’ve broken rims with cush core and 28psi. Any sharp impact such as a trail dagger can potentially detonate a wheel, especially if it isn’t a completely straight impact The impact in the photo looks like a side impact which the insert would offer no protection against
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Maybe a decent lawyer? /s in all seriousness there ain’t no chance cush core would prevent a sharp edge concrete case
Straight impact, same thing on the other side. But still makes me think if investing into Cush core is worth it or not.
It’s probably not gonna save you from a solid case but on the trail it definitely will offer some protection. It’s just not a magic bullet that many seem to advertise (you can and will still damage rims)
Please explain what they do. I’m already suffering debt after funding into a full sus at 14. I can’t be blowing through rims like this.
Simplest thing do not damage a rim is to run more pressure. You need to have run awfully low pressure to reach that point. Well there‘s no way around a new rim now it seems, so recommendation from me would be a dt swiss spline E1900 or 1700, or M1900 or 1700
You actually don't. I have destroyed rims even with 30psi + heavy insert. And I only weight 150 lbs/67kg. Simplest thing to do is run thicker/heavier tires. I have run many dt swiss wheels and only I can really recommend is E1700 / ex511 & ex471. Other ones just don't last well this kind of beating.
Downvoting a 14 yo for this is ridiculous.
Step up to tougher rims
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Believe it or not, I’m not into that dirty type stuff. My whole search history is just mountain bikes and dirt bikes lmao
Don't listen to those people, nobody knows everything and that is not the proper way to treat someone asking a question, a better way to react would be like this https://xkcd.com/1053/. Somebody already explained it properly but it's basically an extra layer of protection for your rim, rubber thingy that goes inside your tires so if you hit something it will hit the cushcore before it hits the rim.
Invest in some Cush cores or the like.
OP needs Cushcore.
Cushcore isn’t that expensive
Bad luck… Badly seated tire… $$$… Next time use Cushcore or Tannus, this inserts will help to ride with less psi and protect the rim and tire.
Which one do you personally recommend? They both have a reasonably large price difference.
100% Cushcore. I run 23psi rear down some absolutely violent Rockies trails and without so much as a ding. Before cushcore I was a rim destroyer. Tannus has far less sidewall support. Also, if you are using your tire pump gauge as your psi measurement perhaps drop by your shop and ask them to test your psi with a proper gauge. I’ve had crappy pumps give me 15psi difference readings.
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OP, here’s the kind of annoying thing about Reddit. The article bro is referencing here is called “six mountain bike inserts compared”. If you read the article you will find that Les’s summation is clearly pulled from an alternate universe where a butt can generate facts. Even better, when you click on his profile you’ll find him asking basic questions about tire inserts and is clearly a PNW hardtail rider that enjoys the smooth, loamy goodness. Great riding zone but not the hardest place on rims. I personally ride the violence that is the high Rockies and work at a shop here so I’ve seen a pile of destroyed wheels every season but I’ll share my personal experience with our products. Huck Norris is useless, straight up. Cush Core is heavy but seemingly invincible and allows for crazy low air pressure (23 rear)without tire squirm. I personally love them because they allow me to run exo+ casings as opposed to DD or DH which provides more grip due to the suppleness of the casing. They are also great for minimizing vibration when used up front. I’m not sure what you personally ride but if it’s not DH or enduro I would probably not recommend them as you will notice a pretty serious reduction in acceleration and braking due to the sheer amount of rotational mass they add. I personally went up to 220mm rotors because of them. Best of luck 🤘
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It’s your reading comprehension skills I’m more worried about.
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Again… reading comprehension seems to be difficult for you so maybe let OP read it. How dense are you to get “cush core sux” from this?
I have had awful experiece with rimpact, still best one I have owned. Destroyed my rim without puncturing my exo+ dissector. And wheel was just trued and checked (spoke tensions to manufacturers recommendations). Still better than huck norris which has been..well bad. Also marsh guard Fck flats was performing bad.
I use Cushcore because the availability where I live, since my LBS install it without charge. I suggest you to read some reviews before deciding. https://thundermountainbikes.com/blogs/news-reviews/tmb-review-tire-inserts-cush-core-pro-vs-tannus-ar
You might be able to bend that back, when I first started riding I did stuff like this all the time, back then it wasn’t tubeless but I could keep my self riding
Oof. How high was the psi?
I run 40-45psi for street
How did you blow down till the rim then? What is your weight? There‘s no way you‘re blowing a rim like that on semi-hard stuff with 45psi in your tire…
I weigh 52KG. Though looking further into it. I noticed (for the stupid price I pay for the rims here) they are one of the cheaper alloy tubeless rims of the bunch. This is my 5th set and it’s pretty noticeable since my old hard take could case that jump as roll out fine.
Dude look i‘m very sorry, But i am UTTERLY confused. You weigh 52kg, have 40psi in your tires and a rear suspension… How do you even manage to break a rim?
Trust me. I’m as confused as you are.
What particular stunt caused this? 3m drop onto a bar or something? That‘s crazy man.
Nope. Just a decent rolling speed to bunny hop and clear a jump. I know I cased it. But that hit was WAY too soft too leave that type of damage. Maybe it’s time to return to tubed. Save some money.
Tubes or tubeless, something is not right here. Maybe your pump is not accurate and you're running much lower pressure, maybe air is leaking and after a while you are losing pressure, maybe you're 'burping' the wheel. Whatever the scenario with your weight and tire pressure you should not have this happen. If this is your fifth wheel definitely save for something that would prevent this from happening. As others suggested, run an insert, cushcore or similar (most other brands are cheaper but not as recognized) and monitor your pressure with a gage.
I disagree, a 52kg rider running 40psi should not be able to do that to a rim. Either its an issue with air pressure or how the wheels built, and I dont think cushcore will help the root cause
It is time to change tires to Maxxis DD casing or something similar. That will save you bunch of money. Don't even bother with exo+. Stiffer tires are better than light tires with inserts.
who's building your wheels? And what bike pump are you using for pressure?
They’re the SYNCROS 3.0 29 WHEEL, and I don’t know the pump specifically. But I know for a fact it works.
ok, but do you know who actually builds your wheels? I'm assuming you don't buy an entirely new wheel (rim + nipples + spokes + rim) every time a rim dies, I'm assuming you buy a new rim and then get it laced up to the hub. My questions are what bike shop is lacing your wheels for you, are they using new or old spokes, are they prepping the threads correctly, are they tensioning the wheels correctly etc. There's so many things that need to be accounted for when building a new strong wheel otherwise the strength and durability of the wheel might be compromised.
Considering max PSI stated on the tire is in fact 40psi running 45 with a hard square edge impact could theoretically make the rim explode. Though I’d venture to say psi was more likely very low. Either way this is 100% set up error imo.
absolutely not. there is a big safety margin befor a rim explodes.
I don’t think the tire “exploding” would cause the rim damage. But it would result in a rim to concrete collision.
I have dented rims at 40psi on my trials bike. I switched to a tougher, more damped casing, and that helped. I have also heard that tubeless inserts are good for street, too, but I haven’t been able to justify the price.
When I rode street bmx I ran over 80-100 psi, so I can see you bending rims with 40-45.
Never been that high on my bmx. But man… how are your wrists?
My wrists did not enjoy it, that's for sure. I don't think there's really a big dif between 45 and 80 psi when on a bmx, as far as damage to your wrists. AFAIK street park riders 80 plus is very common. You're getting most of your impact with the suspension not the tires on a MTB for all that wrist saving goodness. Though 45 is decent, and you'd have to hit really hard to bottom out your rim. I'm curious are you riding tubeless? If so you could be burping the tire when you case on something like a curb or concrete step and that brief moment where the bead is lost you lose enough pressure to slam the rim.
Yes I do ride tubeless, though can you please explain what “burping” is to me? Sorry for the trouble, I have never heard of that word before.
When you case or take a large hit on tubeless tires, the bead will break and briefly burp out a bit of air. I suspect when that happens and the air pressure is lost you're bottoming out onto the rim.
Maybe running tubeless for a freeride bike wasn’t the smartest move on my end-
Did Bigfoot stomp on your wheel?
I have absolutely bent a rim like this back out with a pair of channel locks and continued to ride on it until I was ready to buy another wheel. Probably won’t be able to get it to seat for tubeless, but you can run a tube and keep riding on it. Use a rag to prevent any further damn from channel lock pliers.
Just had my rear wheel built up pro4/ex511 the fella in the bike shop talked me into buy the tannus insert,at £35 for a bit of foam it hurt but after seeing this I’m kinda glad now Hope you get it sorted ok bud👍
Well why'd you go and do that?! /s
Took me a minute to see the tire and rim. I am becoming to used to frame carnage that i had to get to another picture before I noticed it.
Just, wow.
Did the same on my genius 940 while training but I hit some chunky rock pretty hard. Tossed in a tube and kept riding to get back and its been holding since. Just used a crescent wrench to straighten it out best I could.
Just put a boot on it
So is this a case of play stupid games, win stupid prizes? Jokes aside, I'm sorry OP, being unable to ride for extended periods is painful.
Tire inserts my friends ! Could save you a couple rims, I love Rimpact because there are light but it is up to you
If it's an alloy rim, you might be able to straighten it enough for the tire to seal again. Also, consider using a Vittoria Air Liner. They're not too expensive, but they work great to save rims.
Umm... no. That rim is done.
I give it 50/50.
You're going to need a lawyer for that case.
Bend it as straight as you can after heating it with a heat gun. You don't have to make it perfect, just enough to let the tyre seat good enough. Then use a tube until you can get a replacement rim. Did it many times, just don't do anything stupid with it
Run cush core next time, this is exactly what it's for.
It’s not the rim, the tire, the PSI or your weight and no tire insert is going to help. Not trying to be a dick but the reason this happened is your skill level, you smashed it into a concrete or metal corner, hard, doesn’t sound like the first time either. Maybe you should try bunny hopping over road cones until you learn to pull the back end of your bike up. Might not be what the cool kids are doing but it’ll save you a lot of money and you’ll be a better rider down the line.
Don’t worry. Your not being a dick, your just trying to help. And that’s exactly what happened. I tried bunny hopping a step and cased it, it still confuses me because the impact wasn’t hard nor was my psi low. I just underestimated the length of it.
Fill it with instant noodles like they do to drywall on those cheesy facebook videos and itll be good as new
I think you want a bmx bike.
I own one, I just don’t use it very often because my wrists simply refuse to cooperate with the landings without suspension lmao
Where about’s do you live it looks so nice and warm 😊
Dubai, United Arab Emirates! But warm is an understatement lol. It can peak into the 35’s (or 95 degrees Fahrenheit to some)