Questions tagged [crack]

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3 votes
0 answers
77 views

crack in head tube

I am buying a second hand road bike. This is one of the candidates. It looks like a nice bike, except from this crack on the head tube. I have read that bikes with cracks on their frame should not be ...
4 votes
0 answers
36 views

Is my rim cracked, or is it something else? [duplicate]

I had my canyon torque AL5 29inch for 12 days. Today I saw this on my rim. Is it a crack, or is it something else? The crack is positioned at the opposite site of the valve.
10 votes
6 answers
2k views

Is it safe to ride a frame with a hairline crack in the head tube lug?

I am considering buying an Alan Super Record aluminium frame, but there is a hairline crack in the lug on the bottom of the headtube. Is this a big problem, and would it be unsafe to ride it? Is there ...
3 votes
1 answer
87 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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0 votes
1 answer
542 views

Cracked carbon frame near seat post

A thick crack has appeared on the rear side of my carbon frame near the seat post. The crack formed after adjusting the seat post to the maximum recommended height. How might this have happened? Is ...
6 votes
3 answers
1k views

Crack in aluminum seat lug on carbon-aluminum frame

I recently bought this old road bike and just noticed this little crack. Any advice on how to handle this? Can I reinforce it somehow? It's aluminum and carbon fiber frame. Mahalo, Casey
2 votes
2 answers
201 views

Vertical mark on chainstay?

I bought a used 1990's steel bike the other day and have disassembled it for repainting. However I came across a small patch of missing paint on the drive-side chainstay, which had apparently been ...
7 votes
2 answers
1k views

Scratch or Crack?

I'm curious on opinions if this is a crack or a scratch. No crashes. No drops. Yes creaking.
11 votes
4 answers
2k views

Questions about cracks in my rim

I see lots of previous questions about cracks in rims, but most of them (1, 2, 3, 4) turned out to be the rim seam. I don't really see the following type of damage discussed in detail with pictures. I ...
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6 votes
1 answer
305 views

Big crack on my Schwalbe Marathon Plus tire

Is it still safe to ride the below tire, or should I replace it?
0 votes
1 answer
111 views

Carbon crack or cosmetic damage? [duplicate]

I have a new bike and after a bikefit (it was causing me kneepain) I had to raise the saddle and noticed a crack. I only use a torque wrench and tighten it to 4Nm usually so I can't overtighten (4.5 - ...
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1 vote
1 answer
443 views

Carbon or paint crack

Does this crack look cosmetic or structural to you? It's tiny hairline thick. UPDATE: I took the bike to trek store and their technician looked at it (I think he simply did tap test) and said he ...
  • 11
8 votes
2 answers
1k views

Frame dropout cracked, what can I do? (Allied Alfa Disc / carbon)

The frame thru axel hole/dropout cracked while using my wahoo kickr trainer. Is this crack dangerous? If it is, what can I do?
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8 votes
5 answers
3k views

Is My Rim Cracked?

Is my rim cracked? Do I need to replace my rim? Do I need to replace my wheel? (See left/first picture). If either 2 or 3 is Yes, what's the most frugal way to go about it? Notes This is the rear rim....
0 votes
0 answers
145 views

Carbon fork crack?

I have aluminum bike with carbon fork, this is in the front of the carbon fork, it is in both sides of it? It's a carbon crack or paint crack?
2 votes
3 answers
2k views

Does this carbon fork have a crack in it that would make you replace it?

Hello, I dropped the bike from standing and also had a front end collision later. The damage is from dropping the bike from standing because I can see the crack in a much older photo from after the ...
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12 votes
5 answers
6k views

Is it safe to ride on cracked carbon rims (Zipp 404 Firecrest 2010 edition)?

I've got a set of Zipp Firecrest 404 Tubulars (2010). I went over a pothole recently but did not crash. It was a pretty big pothole. After going over the pothole, I heard a rubbing sound from the ...
  • 221
21 votes
2 answers
4k views

Is this rim still safe to use?

I bought it this way without the seller noting the issue, so experience from riding with these is zero. Rims are Ritchey Girder OCRs. The crack is pretty small, but noticeable, and I will be running ...
8 votes
2 answers
3k views

Can this rear wheel be straightened or does it need to be replaced?

This happened on a month old hybrid bike with 350km on it. I unluckily got the back wheel stuck in a grille when getting off a sidewalk. The wheel now wobbles a lot and keeps hitting the rear V-brakes ...
0 votes
2 answers
543 views

Looking for advice - cracked rear hub along bearing races - How to buy a new rear wheel?

TL;DR below My bicycle is an old used Trek hybrid (1994?) that I got a few years back. When replacing the tires recently I discovered that my rear axle was significantly bent (not surprising for a ...
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?
4 votes
3 answers
2k views

Repair frame with crack by seatpost clamp

Is it feasible to repair a crack in a frame around the seatpost clamp? Being an aluminium frame I understand soldering is problematic. It doesn't matter if seatpost is fixed in place as per a solution ...
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4 votes
3 answers
1k views

Is this crack on my seat stay mechanically safe?

Recently picked up a steel frame and realised there was a crack on one side of the rear triangle, right by the seatpost. Crack seem to be contained towards the outer part of the tube so does not seem ...
  • 43
4 votes
4 answers
1k views

WTB Horizon 47c - small crack in the middle of the tire

I’m headed off on a 3 week bike trip and just now noticed a small hole in the middle of running tread of my front tire. I have a few more days before heading off into a more remote area and wanted to ...
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4 votes
1 answer
2k views

A carbon fracture or a paint crack?

I’ve spotted this crack on my carbon fork, only on the left side. The crack is exactly at the joint of aluminum dropout and carbon body of the fork. My bike is a 2010 Trek Madone Project One (OCLV ...
1 vote
1 answer
412 views

How to fix a crack in a silicone grip

I have a brand new pair of silicone grips. Somehow, one of the grips got a crack. Its mostly an aesthetic issue, as no fragments of the grip where lost. Is there any glue appropriate for silicone to ...
2 votes
2 answers
329 views

Is this cracked?

I am buying a bike from eBay and before I bid on it I just wanted to know what you though about one of the pictures. The bike is carbon and it looks like some paint has come off. What do you think ...
user avatar
1 vote
1 answer
649 views

Paint scratch or carbon crack?

I might just be overly paranoid, but does the line in the image (to the left of the glare) look like a paint scratch or could it be a sign of a spreading crack?
2 votes
2 answers
2k views

Noticed a scratch on my carbon steerer, should I be worried?

Pictures: https://imgur.com/a/0cWtcsS My nail gets caught in the center and it feels sort of rough. I had my stem tightened at 4NM and the headset seemed to be properly adjusted. I have once ...
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4 votes
2 answers
6k views

Cracks on tire - still safe to ride?

I just experienced some uncommon cracks on the tires (Schwalbe Durano Plus) The tires are pretty new (less than half year old, and used max. 1500 km). I inflated 6 bars in the tire, and according to ...
11 votes
2 answers
5k views

Crack in fork or just paint

Yesterday I saw something like a crack in the carbon fork of my roadbike. Now I don't have any clue if this is a really a crack or just the paint. Maybe someone can help me or tell me how to find out. ...
  • 819
7 votes
2 answers
1k views

Paint crack or more?

I am looking to buy a used bike: a Cannondale Super Six Evo. The seller has sent me a picture about which I am not sure what is wrong. It seems like a paint crack, but can experts share their opinion? ...
6 votes
4 answers
6k views

Crack/fissure in the headtube

My 2007 Ghost AMR 5700 developed a crack or fissure at the upper end of the headtube. I do not know whether it developed over time or whether there was a specific event leading up to it; it looked ...
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2 votes
1 answer
2k views

Cracks on the side of fairly new tire

Today I noticed that the sides of my rear tire has these cracks The tires have been installed last June, and since then have always been used at the proper pressure (initially at the low end of ...
  • 6,609
2 votes
1 answer
2k views

Very loud cracking/creaking sound on the bike?

On bumps a very loud click sound comes from somewhere on my bike. When I have my weight on the seat and there is a bumpy road, it's a scary loud noise since 2 days. It developed slowly since one ...
6 votes
2 answers
994 views

Cracked frame riding into the back of car, what's salvageable?

Stupidly rode into the back of a car, due to a moment's inattention. I pretty much hit it at full pelt, though I was riding uphill at the time. The frame cracked, as this photo shows. Any idea what ...
8 votes
2 answers
2k views

Is this a cracked frame?

Here's a pic of my Rocky Mountain Altitude 750 2014. It's the area where the top tube meets the down tube / Bottom bracket. Is this a cracked frame or just cosmetic problem? Thanks
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8 votes
5 answers
5k views

Cracked chainstay weld -- now what?

Yesterday while riding my Surly Ogre around town I noticed that it was making a weird metallic popping noise on the left downstroke. When I got home to take a look I was rather surprised to find that ...
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3 votes
1 answer
3k views

How to check carbon frame for cracks

Yesterday, a little boy hit my carbon framed road bike with his little bike while I was already standing. He was not very fast, the normal 'little-boy-dreaming-on-his-bike'-speed. So, nobody got hurt, ...
  • 819
7 votes
1 answer
2k views

Cracked seat post

Just been cleaning my Canondale CAAD8 and noticed these cracks in the seat post - they look like cracks in some kind of outer covering and wondering if someone can tell me how much of a problem they ...
8 votes
1 answer
1k views

Rim cracks on spoke adjustment holes, how much should I panic?

So I have a RODi Rims SKORPION rim and I've noticed that there are cracks on the holes for spoke adjustment. They all appear to be on the left side of the bicycle and I'm not sure if they were here ...
  • 333
4 votes
3 answers
644 views

Did my bike frame crack?

during my morning ride today, I slipped and fell down, and as a result, a crack formed on my carbon frame. I have checked the entirety of the bike and this is the only crack, but I am not sure if I ...
0 votes
1 answer
417 views

Left crank cracks when the left pedal is pressed

My crank has a little slack and cracks more and more when I pedal, but only on only with the left pedal. What could be the cause(s) of this ? Video of the loose crank: ...
  • 103
5 votes
3 answers
3k views

Should I ask for my money back - crack in Titanium frame

About 2 years ago I got my new bike - an Enigma Ti bike. The frame was customised for Di2 and I had hydraulic disk brakes fitted. An expensive bit of kit that was supposed to last forever and make my ...
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1 vote
1 answer
1k views

Crack on Carbon Frame?

I see a crack on the carbon frame of my bike https://www.dropbox.com/s/flqrue2plzyqki9/DSC_0118.JPG?dl=0 The bike is around 4 years old but I just notice the crack line now. I think there was ...
  • 308
3 votes
3 answers
446 views

Crank axle cracked on 1972 Centurion, looking for guidance on how to replace

As I said, I have a 1972 Centurion. Today while riding I hit a pothole as I was coming down on my left pedal. I immediately felt like my pedal was moving around in ways it shouldn't. Stopping to look, ...
4 votes
4 answers
24k views

Should I worry about a chipped carbon mountain bike frame?

The other day while I was racing my Specialized Stumpjumper I noticed a chip on the frame. It's on the rear support bar right behind the seat post between the rear tire. My teammate who is a mechanic ...
5 votes
1 answer
2k views

What caused this seat clamp / frame failure?

Here's my "long distance" ride, which is an old steel MTB without suspension. I picked it up by the saddle to move it and felt some play, I thought the saddle rails might have been loose, ...
  • 103k
7 votes
2 answers
29k views

Is it safe to ride on cracked tyre?

I have a cracked tyre on my Road bike. I think I put it in the gazebo and exposed it to the sun. It's cracking along the tyre wall, in continuous fashion. Would it be safe to ride on those crack ...
  • 3,461
5 votes
6 answers
16k views

What can I do about a cracked frame?

I noticed the other day that my frame has a crack in it! I believe that it's my seat post causing the problem. A couple of questions really, a) how serious is this? and b) can it be repaired? Edit: I'...
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