Questions tagged [crack]

A rift or fissure in a part that shouldn't be there, usually from material stress.

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29 votes
9 answers
8k views

Why do I keep breaking my road frames?

I've gone through four five frames in the last decade or so, all from different manufacturers, all steel but both lugged and welded both steel and aluminium. Every one of them has eventually developed ...
stib's user avatar
  • 1,555
20 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 ...
Legaspi Roy's user avatar
13 votes
5 answers
3k views

Can I trust my bike’s frame after I was hit by a car if there's no visible cracking?

I was waiting at a red light and the person behind me hit me. Her car ran over my rear wheel crushing it and over my frame. I have checked the frame were there are indications of her car but do not ...
Kevin Weckbach's user avatar
11 votes
5 answers
9k 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 ...
jkschin's user avatar
  • 211
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 ...
SSilk's user avatar
  • 4,199
10 votes
7 answers
4k 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 ...
goose_lake's user avatar
10 votes
2 answers
6k 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. ...
Obl Tobl's user avatar
  • 809
9 votes
4 answers
14k views

Titanium frame has a crack - advice needed

I've found a Titanium bike frame on eBay. It's very cheap and the owner says that it has a very small crack on the seat tube where it connects to a bottom bracket. See in the image above: I've never ...
LoomyBear's user avatar
  • 531
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 ...
nth's user avatar
  • 181
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?
evan's user avatar
  • 223
8 votes
5 answers
4k 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....
Black Eye Sweet's user avatar
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 ...
AndrejaKo's user avatar
  • 333
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
danbord's user avatar
  • 258
7 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 ...
shortstheory's user avatar
7 votes
5 answers
7k 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 ...
AnoE's user avatar
  • 755
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 ...
Mr_Thyroid's user avatar
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.
Christine's user avatar
7 votes
2 answers
33k 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 ...
Nhân Lê's user avatar
  • 3,531
7 votes
2 answers
2k 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? ...
user37924's user avatar
6 votes
3 answers
2k 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
Cassius Ramsey's user avatar
6 votes
4 answers
4k 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 ...
Roaders's user avatar
  • 493
6 votes
2 answers
1k 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 ...
Rob Williams's user avatar
6 votes
1 answer
399 views

Big crack on my Schwalbe Marathon Plus tire

Is it still safe to ride the below tire, or should I replace it?
tetrijeb's user avatar
6 votes
1 answer
2k views

Experience with welding Titanium frame?

My Litespeed Tachyon, a 1996 model, of which I am the second owner, (So Litespeed will not honour the warranty) has now developed its 3rd crack. First was in the seat tube above the deraullier and I ...
geoffc's user avatar
  • 2,847
6 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 ...
Kürşad Terzi's user avatar
5 votes
6 answers
18k 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'...
Matt's user avatar
  • 977
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, ...
Criggie's user avatar
  • 124k
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 ...
francis's user avatar
  • 143
4 votes
2 answers
7k 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 ...
clementino's user avatar
4 votes
1 answer
897 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
4 votes
3 answers
3k 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 ...
gorytus's user avatar
  • 43
4 votes
3 answers
2k 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 ...
D Lucky's user avatar
  • 43
4 votes
3 answers
691 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 ...
Onetonwonton's user avatar
4 votes
2 answers
882 views

Do you agree it's safe to continue to ride this carbon bike with a small crack in the frame?

As you can see in the pictures my carbon bike has a crack in the frame, between the seatpost and the corresponding screw. I'm told by my bike shop and by an engineer of the bike manufacturer that I ...
Daniel's user avatar
  • 41
4 votes
4 answers
26k 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 ...
Kyler Rose's user avatar
4 votes
0 answers
42 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.
Brent Welkenhuysen's user avatar
3 votes
3 answers
922 views

Is this a carbon crack or a scratch?

I'm about to buy myself a bicycle but the seller posted there's a slight scratch on the paint. Seems to me it doesn't look like a normal scratch but can be a crack on the carbon itself. Is it a crack ...
Rey's user avatar
  • 31
3 votes
3 answers
481 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, ...
lelandbatey's user avatar
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
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, ...
Obl Tobl's user avatar
  • 809
2 votes
4 answers
5k 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?
user6952886's user avatar
2 votes
3 answers
3k 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 ...
Ebay89's user avatar
  • 177
2 votes
2 answers
350 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
2 votes
1 answer
3k 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 ...
L.Dutch's user avatar
  • 7,121
2 votes
2 answers
3k views

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

Pictures: https://i.stack.imgur.com/PjYGZ.jpg 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 ...
Dev's user avatar
  • 21
2 votes
2 answers
1k 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 ...
moe's user avatar
  • 21
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 ...
bandybabboon's user avatar
2 votes
2 answers
280 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 ...
Morgan087's user avatar
1 vote
1 answer
250 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
710 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?
astroball's user avatar