Questions tagged [damage]

Dents, tears, scrapes, scratches to your bike received in falls, crashes, parking failures, roof-rack collisions, etc.

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

I've relocated to a new town so I'm still looking around for good bike shops. For the time being as I was re-assembling my stem, i noticed a small notch of about 0.5mms on the front of my fork (the ...
Greg's user avatar
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1 vote
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Specialized Sirrus bicycle, fork cracked [closed]

I have a Specialized that was a gift, but have some problems at the front fork. The fork is cracked, as per Photo: Can someone help me to discover how to repair? Other photos of the bike:
Rafael Susano's user avatar
3 votes
1 answer
123 views

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

I scraped my frame on a curb about 1 mm deep in a couple places near the rear axle. (it's a 2021 TREK Domane SL-7). Another post stated that chopper pilots routinely use super glue and baking soda ...
wjktrs's user avatar
  • 535
0 votes
1 answer
94 views

Paint chip or carbon crack [duplicate]

Looking at this bike to buy but I’m 3 hours away from where it is. Not sure if it’s a paint chip or a carbon crack, I asked how it happened and he said he was carrying it upstairs with his bike pump ...
Billy's user avatar
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4 votes
2 answers
1k views

How bad is topping out a suspension fork?

I recently got a relatively cheap department store bike to bring to college, since it will see a lot of wear and will be kept in the elements. However, whenever I lift the front wheel (as in to get on ...
toomanyfeet's user avatar
3 votes
1 answer
722 views

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

Mudguards have worn away where they contact the seat stay on carbon frame. A little deep, wondering if cosmetic or more serious. The one on the right stay doesn't look as deep but you can see 3 ...
olivercroke's user avatar
2 votes
2 answers
275 views

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

My aluminum bike (Cannondale Adventure 1) was scratched on the welds connecting the seat tube and seat stays, and I was wondering if the damage is purely cosmetic, or if there is any structural damage....
Peachy's user avatar
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6 votes
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Small dents on bicycle frame

Two weeks ago I bought Trek Checkpoint ALR5. Bike rides pretty well. It has aluminium frame. I bought it primarily for bike packing trips as it has ton of mounting points. After riding it for 2 weeks ...
Aivaras Poška's user avatar
6 votes
2 answers
649 views

Attachmentpoint rim brakes carbon bike, sratches/crack?

I own a 2019 Rose XLITE carbon road bike with rim brakes. Today, I conducted a thorough inspection, taking things apart. At the rear of the bike, on the attachment point where the brake is fixed to ...
roverhendrix's user avatar
5 votes
1 answer
2k views

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

While attaching an equipment on my bike, I accidentally started to screw into the bike frame. I only realized a few weeks later when I dismounted that said equipment. I'm pretty sure I used a ratchet ...
SaltyVinegar's user avatar
0 votes
0 answers
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Damaged carbon fibre [duplicate]

My chain dropped and got stuck in my bottom bracket while I was going uphill. I think the force from the pedal stroke damaged the carbon fibre. Wondering what is recommended when something like this ...
Jocelyn's user avatar
2 votes
2 answers
625 views

Is there an issue with this seatstay? photo

is this seat stay normal or is there a dent / damage here? Hard to tell it's near the welding but the other side does not have this. From https://imgur.com/a/xUtmeKN
tweedi's user avatar
  • 587
3 votes
2 answers
793 views

Carbon chainstay damage assessment

Is it likely that the carbon is fractured based on my pictures, making it unsafe to ride? I discovered an odd, oval-shaped scratch on my chainstay. I remember my bike being knocked over on the asphalt ...
Nicolai's user avatar
  • 31
7 votes
1 answer
342 views

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

First time working with carbon. Bought a longer compression plug, because it came with a very small one, not even covering the whole height of the stem. I tightened it to 7 Nm. Took a while… Made ...
user69725's user avatar
2 votes
2 answers
1k views

Aluminium fork dropouts hit floor - need to worry?

I had my bike in a bike stand without wheels, clamped by the seat tube. As I loosened the stand mount lock the bike slipped out of my hand and suddenly rotated forwards as most of the weight was in ...
user4520's user avatar
  • 573
5 votes
3 answers
462 views

How should I deal with this splintered carbon steerer?

I made a bit of a mess of my fork's carbon steerer while cutting it: I deliberately cut the steerer around 10 mm longer than I needed it. While cutting, the steerer was secured in a stem up to this ...
Will Vousden's user avatar
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8 votes
3 answers
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For a broken chain on a child's small bike, do I replace the whole thing or just a single link?

I have a toddler bike that has lost one of the side plates to a chain link. Should I replace the whole chain or can I just get a new side plate for the missing link? If I should replace, the whole ...
buggaby's user avatar
  • 183
4 votes
1 answer
752 views

Is it possible to damage the crankset while removing the pedals?

I got a brand new bike and I wanted to replace the pedals with the ones from my old bicycle. However, while removing the pedals from the new bike, I forgot that one of the threads was reversed and ...
fabda01's user avatar
  • 209
5 votes
1 answer
595 views

Nut dents on stamped dropout

Problem with stamped dropouts on singlespeed. There were dents from the nuts. It became inconvenient to operate the bike (the wheel is poorly fixed and constantly moves out). It is impossible to ...
dtn's user avatar
  • 153
9 votes
7 answers
2k views

Spokes damaged by chain – should they be replaced?

When servicing my rear hub I discovered that the drive-side spokes have been damaged by the chain. The spokes are rough to the touch (one even had a sharp edge that caught my nitrile glove) and some ...
Will Vousden's user avatar
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2 votes
0 answers
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Should the seatpost clamp be installed backward for a carbon seatpost in an aluminum frame? [duplicate]

Is it true that the seatpost clamp must be installed backward (i.e. its slot facing the handlebars) or at least with a slight offset to avoid aligning its slot with the aluminum seat tube slot when ...
olliebulle's user avatar
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2 votes
1 answer
148 views

Bicycle fork fatigue test duration

For a bending fatigue test for a bicycle fork, according to ISO 4210-1, The number of cycles should be 120,000 for stage one of the bending fatigue test and 100,000 cycles for stage 2 of the test. How ...
Dan's user avatar
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1 vote
2 answers
338 views

How bad is my frame damage?

Recently my rear wheel locked up while going downhill, the lockup caused the damage in the foto(scoring in the aluminum frame by the axle) is it bad? The bearing is of course destroyed. Yes, it is ...
Ivan Beck's user avatar
3 votes
2 answers
1k views

Worried about chip in carbon road bike frame

I am planning to get a second hand medium range road bike and this is the first full carbon road bike I'm getting. However, upon checking the bike, I can see there is a surface chipping on the top ...
debugger89's user avatar
4 votes
1 answer
225 views

Can I continue use abraded rim?

Today my tire blew up and I had to brake by bare rim and, as a result, the rim abraded in one place from 3mm to 2mm. Can I continue to use this rim or I need to repair it in the shop or order a new ...
Oleg's user avatar
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1 vote
1 answer
391 views

Scratched hydraulic brake hose during install - should I be concerned?

today I was installing brand new GRX brakes into new frame. It was not my first time, I've already build 10+ bikes, I messed up through. I inserted rear brake hose without any issues, I had my guide, ...
messed_grx's user avatar
7 votes
1 answer
439 views

How to check bike damage after impact

I got involved in a frontal crash with another cyclist: they turned back to greet a friend and while doing so they invaded the opposite lane of the cycling path, where I was transiting. ...
L.Dutch's user avatar
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5 votes
2 answers
2k views

How bad is this dent?

I have found this used Specialized Diverge(aluminium frame) and am wondering how bad this scratch/dent on the side of the top-tube close to the seatpost is. I have looked at other posts and I don't ...
Hugo Erlandsson's user avatar
2 votes
2 answers
187 views

Can the e bicycle motor be damaged on full throttle with wheel locked

I have a hub motor 250w e bicycle with a 7.8 mah 36v battery (https://felidaeelectric.com/maven-e-bike-n/). This ecycle has both pedal-assist and a throttle. Using it for school commute and will be ...
Aniruddha Apte's user avatar
2 votes
1 answer
175 views

Chip in carbon seat tube?

I pulled out the seatpost on my Giant TCR and notice something like a chip in the seat tube, are defects like this normal?
Luigi's user avatar
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9 votes
2 answers
2k views

I have a bent aluminum rim on my Merida MTB. Is it damaged beyond repair?

Consider: I was riding my local trails today, got a flat tire (due to not riding tubeless) and before I realized it, I hit a jump with too little air in the tire and I bent my rear rim. Is it is ...
Andreas Patrik Lukáč's user avatar
1 vote
1 answer
247 views

Lots of cracks - safe to ride?

I probably shouldn't have, but I just bought this 2016 CAAD 8 second hand for cheap. I'm trying to work out if it's safe to ride. There are cracks all over the carbon fork (and in the rest of the ...
Matt's user avatar
  • 13
1 vote
1 answer
93 views

Multiple gears shifted while not pedaling

It happened again, but much worse this time. Someone shifted the front derailleur from 2 to 1 and the rear derailleur from 5 to 9 without pedaling when I was in school. Does this do any significant ...
Rohith Nambiar's user avatar
3 votes
1 answer
255 views

How bad/deep is this chip on a carbon fiber bike frame?

Does it cut into the fiber or just some paint chip?
Ning Wang's user avatar
  • 239
6 votes
4 answers
1k views

What does it feel like to ride a mtb that has a bent frame

What are the signs and symptoms of a bent mtb frame? Or bent forks? What does it feel like when riding it?
Alison's user avatar
  • 1,007
4 votes
1 answer
277 views

Can shifting front derailleur while not peddling cause damage

I was in school when someone shifted the front derailleur from 2 to 1 without peddling, the problem is I am not sure how long ago it was shifted, at max it could have been 6 hours, does this do any ...
Rohith Nambiar's user avatar
2 votes
2 answers
213 views

Welding a centre kickstand plate to 4130 steel frame?

Hopefully a simple question (?!). I'm wondering if you could help me with a simple answer. I have a 30 year old UNIVEGA tandem frame that my family and I love to ride. The problem is, with a baby-seat ...
Jason's user avatar
  • 21
4 votes
1 answer
818 views

Is this crack in a used bike's head tube safe enough to purchase the bike?

I am buying a second-hand road bike. This is one of the candidates. It looks like a nice bike, except for this crack on the head tube. I have read that bikes with cracks on their frame should not be ...
Eduardo Negredo's user avatar
9 votes
3 answers
3k views

Did my frame just break?

Bike: Raymon HardRay E-Nine 6.0 I just finished adjusting the gear shifting for my first time. As I went for a test drive the chain immediately slipped down. Then I saw this. First I thought the ...
Schwenk's user avatar
  • 396
16 votes
3 answers
4k views

Is it safe to ride an aluminium bike with a big top tube dent?

Someone tried to steal this bike - they damaged the top tube. The frame is designed with a wide flat top tube. Is this still safe to use?
dtcooper's user avatar
  • 161
4 votes
4 answers
2k views

Carbon damage assessment

Is it safe to ride? Will jb weld fill do the trick? Seems like this damage was caused by a to wide tire rubbing the frame. I don’t see any fibers exposed to be honest(but I might not know what I’m ...
Soks's user avatar
  • 71
4 votes
1 answer
431 views

Is this a crack? Came off my Carbon frame for the first time

A guy on his phone just walked out in front of me into the bike lane and I plowed him at about 30kms. I walked away without a scratch and he absorbed most of the impact but my bike did hit the ground. ...
carboncarboncarbon's user avatar
11 votes
3 answers
1k views

Bubbles in carcass/ casing of Schwalbe Pro One TLE

I noticed two small bubbles on the carcass of my rear tire. I am running the 32mm Schwalbe Pro One tubeless at around 4bar /60psi and it wasn't particulary hot when the bubbles appeared (~20°C). The ...
Kevin's user avatar
  • 111
3 votes
1 answer
110 views

Cracks on tyres

Have cracks of tyres on two bicycles. See attached photos. Bicycle 1 (top), 2 (bottom). It isn't dry rot ( What are these cracks in the side of my bicycle tyre called? Does this mean that my tyre is ...
Sxx's user avatar
  • 31
7 votes
4 answers
2k views

Dropout damage mystery, how to fix it? [Photos and videos]

This is a 90's aluminium frame with 130mm spacing between dropouts which originally had a 7 speed cassette. 2 years ago I changed the rear wheel for a standard 135mm and put a 9 speed drivetrain. I ...
tweedi's user avatar
  • 587
2 votes
0 answers
112 views

Gear up lever will not move

I just got a new bike and unfortunately fell off it on the first ride, now the lever to change gear for my derailleur Mezzu Microshift is stuck in the position it would be if you had upped a gear ...
user37577's user avatar
  • 121
4 votes
2 answers
1k views

How to restore broken rear disc brake mount in carbon frame?

Look at the image: Bike model is Rocky Mountain Vertex 990. The frame is broken in a way that it's impossible to install rear disc brake. Possibly there may be a frame deformation. Is it even ...
Politechniczny's user avatar
3 votes
2 answers
609 views

Remove Shimano 105 left crank arm

I'm trying to remove the left crank arm. I've previously been able to do this with a 10 mm Allen key. But as you can see, this time it's stuck. Does anybody know which tool is best for the job? I fear ...
Bjm's user avatar
  • 81
7 votes
1 answer
5k views

Chain damaged carbon frame. How to remedy?

During a recent fall, my chain came off my front chainring, and scratched up my frame. It looks to me like it's just the paint that's damaged but would appreciate a second opinion. The bike is a Trek ...
TimoStaudinger's user avatar
4 votes
1 answer
890 views

Dent below seat stay on a steel frame safe to ride?

This is a Surly Krampus frame; I just noticed this small dent while cleaning. It was purchased brand new, I've had it for about 2 weeks. Should I be worried?
King Perds's user avatar