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13 votes

Carbon chainstay damage assessment

That does not appear to be damage, in as much as it conspicuously appears to be the shape of where a chainstay chain-slap protection sticker was originally placed. what you are possibly seeing is the ...
Ted Hohl's user avatar
  • 6,357
11 votes

Attachmentpoint rim brakes carbon bike, sratches/crack?

The frame is cracked and should be repaired. It's likely nothing to do with the crash, unless perhaps the brake was impacted. This could result from the recessed nut either being overtightened, from ...
Nathan Knutson's user avatar
10 votes

New carbon road bike - scratches discovered on chain stay

Chains can slap against the chainstay. With the condition of roads in the modern United States, it’s almost guaranteed - I can only speak to this country and to Singapore, which doesn’t have freeze-...
Weiwen Ng's user avatar
  • 32.5k
9 votes

Wear marks on seat stay from fender/mudguard. Problem?

You have worn right through to the carbon, and possibly into it. There is a school of thought (stress testing by Reynolds) that the seat stays don't do very much. This may go against logical thought. ...
Noise's user avatar
  • 14.1k
9 votes

Started to drill into alu frame - how bad is it?

Since this is on the central vertical tube of the bike that carries your weight on top of it, I'd say that this is just cosmetic. This tube not under tensile load, so it is not prone to fatigue ...
cmaster - reinstate monica's user avatar
8 votes

Small dents on bicycle frame

If this were an ultralight aluminum frame, then even those dents would be potentially concerning. But the Checkpoint is not such a bike. Ultralight aluminum isn't even that common these days. Yes, ...
Weiwen Ng's user avatar
  • 32.5k
7 votes

How bad is topping out a suspension fork?

I wouldn't worry about it. If a suspension fork bottoms out, it can hit the end of the compression with a substantial amount of force, but if it "tops" out the impact force is limited to ...
SimonL's user avatar
  • 1,083
6 votes
Accepted

How far a damaged rim can be taken safely

It’s impossible to say scientifically, but chances are the damage is not material. You can exercise watchful waiting. That is, leave this photo up, and check back next week to see if anything looks ...
Weiwen Ng's user avatar
  • 32.5k
6 votes

Small dents on bicycle frame

Looks like you've peeled back some paint protector to see the dents better. Was there damage to the plastic from rocks? Also, these dents seem to be too high up the downtube to have come from stones ...
Criggie's user avatar
  • 125k
6 votes

Attachmentpoint rim brakes carbon bike, sratches/crack?

I realized that i have a Rose service Partner in town. I brought the Bike there to See If my 6 year frame warranty needs to be used. They inspected again and said: Cracks are in Paint Job. Carbon and ...
roverhendrix's user avatar
6 votes

Is there an issue with this seatstay? photo

I would scratch around the paint edges with a sharp pick or screwdriver. You're looking for rust, and that means flaking off loose paint. Once you expose all the damage and poke at it to make sure ...
Criggie's user avatar
  • 125k
6 votes
Accepted

Are these scratches in my aluminum frame structural or purely cosmetic?

Cosmetic only. The stand clamp has munched on the paint/gel coat and put some scratches in the weld surface. Annoying at worst but nothing structural. Some light finger tip sanding and nail polish of ...
Warren Burton's user avatar
6 votes

Wheel scratched carbon on ride

I don't see any frayed carbon fibers, nor any cracks propagating from the worn area. I've raced on a bike with much worse tire rub on its seat stay - again, with no frayed carbon fibers or cracks - ...
Andrew Henle's user avatar
  • 10.6k
4 votes
Accepted

I suspect that my carbon fork has a crack but I can't really tell

This question and the answer will probably help some, and the answer includes photo examples of types of damage. The steerer ring of death photos may be a helpful reference. In this case, I don’t ...
Weiwen Ng's user avatar
  • 32.5k
4 votes

How bad is topping out a suspension fork?

Without knowing more about the construction of the fork it's hard to say for sure. I would offer a guess that your fork slamming into its lowest position on your fork will not make it break any sooner ...
David D's user avatar
  • 21.5k
3 votes

Is there an issue with this seatstay? photo

I cannot tell you what you should do. Your tolerance for risk of a failed seat stay determines that. If concern about it means you are no longer enjoying riding the bike, further investigation is ...
mattnz's user avatar
  • 50.9k
3 votes

Are these scratches in my aluminum frame structural or purely cosmetic?

Bottom photo shows what are most likely cosmetic scratches. The top photos look to me like the weld has failed - in which case the frame is unserviceable. If this is merely a scratch - how did it ...
mattnz's user avatar
  • 50.9k
3 votes

Paint chip or carbon crack

Even from the low resolution photo this looks much worse than a simple paint chip. Not worth pursuing in my opinion.
Michael's user avatar
  • 27.8k
3 votes

Wheel scratched carbon on ride

For reference, this answer offers general guidance on what to do if you're not sure if a carbon frame is cracked. That answer contains some photographs of abrasion damage from the infamously muddy ...
Weiwen Ng's user avatar
  • 32.5k
3 votes

New carbon road bike - scratches discovered on chain stay

The regularities and shapes of the scratches suggest IMO that it might be from an interaction with the chains outer plates. Looks completely superficial/cosmetic to me. I would probably just put on ...
WornChain's user avatar
  • 1,569
2 votes

New carbon road bike - scratches discovered on chain stay

Like others have said, the markings look like they've resulted from the chain scratching the chainstay. This is not uncommon, and protecting the frame with some type of tape is the easiest and the ...
EyeBrown's user avatar
  • 246
2 votes

OK to ride with a slightly bent mech hanger?

It was the late 80s or very early 90s when replaceable rear derailleur hangers (yeah, yeah, I know...mech) first made their way onto mtn bikes. At that time the rule was that even with slight ...
ohio_2_erie's user avatar
1 vote
Accepted

Super-glue for minor scrapes on carbon fiber frame - below the top-coat

The fibers won't move as they are a laminate with epoxy resin. They float in glue, even if there is very little glue. U could use superglue to cosmeticaly close the hole. Keep an eye on it periodicaly ...
J.S.'s user avatar
  • 144
1 vote

Tightening a compression plug - manufacturer says 9-12 Nm, seems too tight at 6 already

I have rode a bunch of different bikes with different styles of compression plugs and I have learn a few things and sometimes you don't need to torque it down all the way to what the makers says. If ...
dmb's user avatar
  • 818
1 vote

E-Bikes - Is it bad for the bike to run out of battery?

Do not leave the empty battery for very long as it slowly self-discharges over time. The charging level then may drop below what is safe for the battery. E bike controller turns the assistance off ...
nightrider's user avatar
  • 7,859
1 vote

Carbon chainstay damage assessment

Based on the photos provided, I would agree with the above comment that it looks a lot like a plastic protective layer that is often sold on higher end carbon bikes, especially around the areas most ...
michael freeman's user avatar

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