Questions tagged [damage]

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

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11 votes
3 answers
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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 ...
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  • 111
3 votes
1 answer
83 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 ...
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  • 31
6 votes
4 answers
904 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 ...
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  • 353
2 votes
0 answers
60 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 ...
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4 votes
2 answers
656 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 ...
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3 votes
2 answers
160 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 ...
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  • 81
7 votes
1 answer
1k 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 ...
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4 votes
1 answer
637 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?
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2 votes
2 answers
243 views

Possible damage in carbon fork of used road bike I'm about to buy

I'm about to buy this used Giant TCR (year?) road bike, but I noticed it has a raised mark on one side of the fork. The bike shop knows nothing about it and it seems structurally fine. May it look ...
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  • 121
7 votes
5 answers
2k views

Should I replace this frame with a badly scraped chainstay?

I crashed yesterday and damaged this aluminum frame. At first I thought I shouldn't worry, but giving it a second thought, I think I should just replace before it breaks while riding. I would say it's ...
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5 votes
3 answers
174 views

Burning smell from rear rim cantilever smooth pull brakes

Engaging the rear brake results in a burning smell and significant brake wear, so bad that within just a hundred miles or so I caused significant loss of material on a brand new pad set. Looking at ...
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5 votes
1 answer
222 views

Safe to ride racing bike with dent in frame? (with images)

Through some relatives I got a Cannondale R700 2.8 bike for free, but it has a dent in the frame, and I heard from some people that it could be serious issue. So my question is, is it safe to ride ...
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  • 153
11 votes
4 answers
2k views

I have a question regarding the structural integrity of my aluminum frame after its having... incurred damage;

Apologies if this has been covered previously, but I didn't see it if it had been, and at this point I'm at a loss. For context, the bike in question is this year's Haro Double Peak Sport 29 https://...
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10 votes
2 answers
801 views

Method for shortening a damaged hydraulic brake hose?

I had an incident recently that resulted in a damaged hydraulic hose. It was munched by the chain. Curiously, the brake still holds pressure and functions, though I have limited confidence in it. I'...
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  • 99.1k
5 votes
1 answer
410 views

Can I use fiberfix tape to reinforce this shoddy weld?

I recently built a hi-ten steel bike and I just realized that it had a large hole in one of the welds near the seat tube and the top tube. Tried taking it back to the shop that shipped me the frame ...
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  • 61
0 votes
1 answer
113 views

Should I Upgrade my MTB Rear Derailleur? (After Crash)

I mashed my 8 speed Shimano Acera rear derailleur in a crash over the weekend and need to get it replaced. Is it worth spending a little extra money and installing a slightly higher-end derailleur, ...
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3 votes
2 answers
226 views

Brake damaged carbon frame — what to do?

I packed my Edmonda SL5 carbon frame for a road trip. In the bag, the front brake touched the frame and left a mark — definitely deeper than just the paintwork. It's unclear how deep the damage is to ...
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  • 33
26 votes
8 answers
8k views

How bad is switching derailleur gears under load?

I have heard several times the wisdom that you should not switch derailleur gears while pedalling hard ("under load"). The "right way", according to those people, is to pick up ...
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  • 663
2 votes
3 answers
475 views

What are the times and costs involved in assembling a rideable bicycle from a salvaged frame?

Let's assume I bought a frame for XXX eur/usd/gbp. It usually is a steel frame from late '80s/90s, or an aluminium frame from the early '00s. The frame is of decent quality, it does not present ...
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  • 3,156
13 votes
1 answer
2k views

What do I do when I am unsure if a carbon fiber component is safe to use or needs replacing or repairing?

Intended as a canonical answer to the many questions we have about damage to carbon parts. It is well known that carbon fiber parts can be damaged and fail, and carbon parts can be fragile when ...
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  • 40k
3 votes
2 answers
4k views

Chips in carbon frame - how worried should I be?

I am looking for a second hand road bike. This is to be my first mid-range bike, and my first introduction to carbon frames. I have done a bit of research, and am aware of the potential risks of ...
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  • 179
7 votes
5 answers
3k views

Cracked rim around the spoke

I purchased a pair of Carrera Vendetta wheels, 27.5" with 2.8" tyres. I found a couple cracks where the spoke sits around the back rim. Is it okay to ride or is it okay to weld them?
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4 votes
2 answers
963 views

Seat tube dents from Front Derailleur band-on. Is this gonna get worse over time?

I just noticed it on the seat tube yesterday. Looks like a front derailleur clamp mark though I'm running a 1x setup (my LBS might've tried something on it before I purchased). Just worried about the ...
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6 votes
2 answers
1k views

Shredded bits of material under my trainer

I'm starting to get a pile of what looks like tire rubber under my trainer. Could it be something else like dry chain lube coming off? Is this normal? Have I set up my trainer incorrectly? Do I just ...
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3 votes
1 answer
263 views

Canyon ULT and Wahoo Kickr

Bought a wahoo Kickr in November and noticed a small chip to my canyon ultimate carbon frame. In January, Canyon announced the Ultimate was not compatible with Kickr. I'm dealing with Canyon and Wahoo,...
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4 votes
6 answers
1k views

I stripped one of four bolts on the faceplate of my stem. Is the stem usable until the replacement arrives?

The aluminium stem on my road bike says the max torque for each of the four faceplate bolts is 6nm. So I set my calibrated torque wrench to 6nm... and one of the bolts stripped its thread. I guess “...
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  • 309
2 votes
2 answers
399 views

To buy this damaged carbon bike or not?

I'm looking to get an MTB and have been looking for this particular one for quite a while but stock is hard to get hold of. I managed to find one in a store but the bike is damaged unfortuntely and ...
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3 votes
2 answers
179 views

Bits "peeling off" schrader valve?

I've got a bike that hadn't been used in a while until a couple weeks ago, it was in a place where it gets direct sunlight (I'm trying to fix that) and as a result some things like the seat have ...
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6 votes
4 answers
748 views

Should I replace the tyre or can I keep going?

I just noticed a small tear in my Continental GP 4000s. It does not bulge out from the side. The tyre have been on for some years now but dont have more than 1000km on them. I am worried though if I ...
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  • 61
6 votes
4 answers
2k views

Cause of broken spokes (pictures included)

I never had this problem before. Two spokes on the drive side of my road bike's rear wheel broke at the J bend, and I'm trying to identify the cause. The wheel has 32 spokes total, made of steel, ...
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  • 1,130
0 votes
2 answers
106 views

Damaged cog while taking it off

Damaged my cog while taking it off. Is there any possibility of repairing it?
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18 votes
6 answers
7k views

How is this damaged aluminium frame likely to fail?

I had an unplanned collision with a car yesterday (everyone is fine, thankfully) but my bike – a Giant Revolt 1 – now has a lovely new pair of dents. I cycled it home from the collision (~6km) and it ...
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  • 290
3 votes
1 answer
465 views

Carbon steerer tube scratch (inside the tube) - how bad is it?

Today I looked into my steerer tube and saw this: Since Im new to carbon frame, I cannot decide if this is a serious problem which has to be fixed asap, or just a minor scratch on the surface. It ...
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3 votes
1 answer
137 views

I just banged up my bike, what damage should I look for?

I'm sort of looking for a "generalized checklist" of damage types to look for on a bike that I recently slammed and dragged against a lot of things and now runs a little slower than before. ...
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  • 133
8 votes
7 answers
4k views

Why is a damaged bike tyre a problem?

I have seen / heard of cases where bike tyres get damaged (like for example riding on a flat). But what I don't fully understand is why the damage becomes a problem or whether the tyre actually needs ...
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0 votes
1 answer
202 views

Bike tyre damage from riding on a flat?

So I started riding my 10 year old MTB again and got a flat front tire around 4 miles away from home. Being a novice, I decided to ride it all the way home. Found a hole in the inner tube and ...
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8 votes
3 answers
2k views

Broken rear brake - told it was unfixable

I have an older model Trek mountain bike. I took it to the shop for an annual tuneup and they called me to say that the rear brake broke off the frame and that it can't be fixed. The entire brake is ...
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  • 89
3 votes
1 answer
509 views

Front wheel tilted fork alignment problem

I have this Dawes Discovery Twin and there seems to be a problem with one, or maybe both, of the quick release dropouts. The front wheel tilts a little to the right and rubs the brake shoe. I already ...
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7 votes
3 answers
883 views

What can I do to fix or replace this broken axle?

I cased a jump badly and I broke either my bottom bracket or crank, I’m not sure which. What can I do to fix or replace this? Picture is of my broken bottom bracket or crankset.
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  • 71
5 votes
3 answers
1k views

Protecting Tires from House Cats [closed]

I have a friend with several cats, one of which destroyed the material of their bike tires and is presumed to enjoy doing so.. having acquired new tires and tubes (but not yet put them on), how can we ...
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  • 167
2 votes
2 answers
394 views

Can this rim damage be fixed or do I need a new rim?

I somehow managed to ride over a screw that pierced through my tire and was long enough to reach the rim. It scratched the rim a few times (for as many wheel revolutions that it took me to stop the ...
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4 votes
2 answers
222 views

Is this a helmet defect or not?

I bought a new Giro Savant helmet online and, after unboxing, noticed that the EPS foam seemed to be quite jagged and uneven at the intersection with the dial system (see photos below). This does not ...
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5 votes
2 answers
3k views

How can I repair carbon damage near my bottom bracket?

I have had a few gnarly chain-drops that ate at my Open U.P. carbon frame. I thought I just had some chips in the carbon, but today I removed my crank for a full bike clean and realized that the ...
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2 votes
1 answer
627 views

Aluminum fork dropout potentially compromised - advice?

I hope y’all can give me some advice. I bought a bike, had it shipped, looks great except one thing — the fork was slightly damaged in shipping. It’s carbon but the aluminum part that attaches to the ...
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  • 21
4 votes
1 answer
343 views

Carbon frame chipped by chain - how to repair?

I found out my chain is damaging my frame near the cassette. How can I repair this? It was damaged by my cassette in the indoor trainer which I am not using anymore. This is how it looks:
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  • 41
2 votes
4 answers
3k views

Scratch or damage on carbon frame

I found this 'scratch' on my carbon frame on top of the front derailleur. Not quite sure when or how it appeared. Could this be more than a scratch?
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7 votes
2 answers
1k views

Cycled through pothole on carbon frame - damaged?

Yesterday while out on my daily exercise (I live in London) I had to cycle through a pothole (bus too close behind so couldn't swerve or stop) that jolted the whole bike. I then noticed a rattling ...
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1 vote
3 answers
3k views

Rear derailleur bent (not derailleur hanger)

Got a (heavy) plastic bag stuck in my rear derailleur of my <1 year old Salsa Journeyman Apex 1, the bag fully wrapped into the derailleur wheels while I was biking at about 10-15 mph. I had to ...
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  • 309
3 votes
2 answers
220 views

Bottom bracket damage work-around

I built up a Specialized Rockhopper over this last summer, ending up with a sleek, blacked out, Deore & XT equipped thing of beauty. During a brief stop at a buddy's place, the 12mm Kryptonite ...
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  • 6,928
3 votes
4 answers
3k views

Should I buy this bike with a dent in the top tube? Is it safe?

I'm considering buying this used steel-frame bike. But the top tube has a small dent (about one-third of the way from the saddle). Is this a problem? I plan to use it daily (~6-7mi) for commuting to ...
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