Questions tagged [damage]
Dents, tears, scrapes, scratches to your bike received in falls, crashes, parking failures, roof-rack collisions, etc.
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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....
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What do I do when I am unsure if damaged carbon fiber 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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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 ...
- 121k
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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 ...
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OK to ride with a slightly bent mech hanger?
My rear derailleur took a knock from a fall, and the entire shifting range moved inwards by about one sprocket width. I suspect, but am not sure, that the mech hanger got slightly bent (could be ...
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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 ...
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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 ...
- 121k
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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
- 121k
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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 ...
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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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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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What options do I have if my rear derailleur breaks when I'm out on a trail?
I ran into an unfortunate situation earlier this week. I was out on a mountain bike trail, alone — just me and my hardtail. I'm pedaling, when I suddenly hear a CRUNCH and my bike stops. The hanger ...
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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 ...
- 121k
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Front disc brake wobbling / grinding on pads after full braking and minor plunge
The front disc brake grinds after a light accident with full braking and plunge.
To give an idea of the forces involved:
The bike fell to the left, mostly cushioned by me. The bike had no more ...
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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 ...
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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 ...
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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 ...
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Carbon Fibre Frame Paint Chip from Stuck chain
My chain got stuck between smallest chainring and carbon fibre frame.. The paint chipped in one place and there is a half mm scratch in another place..
What is the chance that it damaged the carbon ...
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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 ...
- 121k
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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 ...
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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 ...
- 121k
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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, ...
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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. ...
- 121k
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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 ...
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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 ...
- 121k
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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?
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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 ...
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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 ...
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carbon frame chipped
today while I was riding I lost control of my bike; it was nothing serious, I even fell "standing", but my bike fell on a rock and the carbon frame was chipped.
Should I worry about the damage?
I ...
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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 ...
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How bad/deep is this chip on a carbon fiber bike frame?
Does it cut into the fiber or just some paint chip?
- 26k
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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?
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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 ...
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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 ...
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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 ...
- 81.7k
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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?
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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 ...
- 21.8k
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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.
...
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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 ...
- 29.5k
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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 ...
- 26k
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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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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 ...
- 121k
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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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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 ...
- 121k
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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 ...
- 81.7k