Questions tagged [carbon]
Frames or components made from carbon fiber, possibly even about carbon accessories.
305
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What are the risks of a compromised top tube and of attempts to repair it?
I understand that the top tube undergoes mostly compression (rather than tension or twisting) forces. My question is: what happens if a top tube is compromised? What are the risks?
For context, I'm ...
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votes
2
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Is this carbon fork damaged?
How can I know if this carbon fork is damaged ?
The seller of the bike tells me that he didn't fall, but I can't know for sure.
How can these scratch happen otherwise ?
Also there are some on the seat ...
- 71
4
votes
1
answer
207
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Seatstay eyelet cracked on carbon frame
I have noticed that the seat stay eyelet for my rack has developed a crack. I'm not sure if this is just in the veneer or if it's cracked the actual carbon fibre too. I only installed the rack a few ...
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1
vote
2
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Is the framed cracked?
I have noticed this scratch/crack on my canyon exceed cf6 frame. Can I get someone else’s opinion on what they think about it?
I have never overtightened the seatpost bolt to more than specified and ...
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8
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4
answers
937
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Recommendations Modifying/increasing a bicycles Max Weight limits
I purchased a Urtopia Carbon 1 Pro ebike. I didn't pay attention to its weight limit, which is 240 lbs. The bicycle net weight is 34 lbs. Unfortunately, I am 6'3" and weigh 316 lbs. The bike ...
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New carbon road bike - scratches discovered on chain stay
New carbon road bike (~1 month), rode less than 200 miles. When cleaning the bike, I discovered several scratches on the chain stay, near the cassette. Could this be due to a manufacturing defect, a ...
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2
votes
0
answers
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Lubricate between spoke nipples and carbon rim?
When building wheels, nipples should be lubricated so they can still turn easily under tension, towards the end of the build.
When building a wheel using carbon rims, do you also lubricate the contact ...
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Wheel scratched carbon on ride
Wheel scratched carbon seat tube
Hi everyone,
Recently my wheel scratched my carbon seat tube as it loosened at the end of my ride. Was wondering if it is safe to ride.
Imgur has 4 images, 2 are below ...
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0
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0
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91
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Carbon seatpost stuck due to damaged grub screw
I have an Orbea Orca 2024 with Di2 and the grub screw for adjusting seat height has potential thread damage and it won't come out. The bike mechanic explained that the reason the grub screw went so ...
3
votes
1
answer
391
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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 ...
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3
votes
1
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283
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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 ...
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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 ...
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6
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4
answers
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Cracked Carbon Seat Tube
I was riding when my seat tube cracked as I rode over a hump.
Are there any possible fixes for this like epoxy, sanding, or something?
I'm losing sleep over this.
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3
votes
1
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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 ...
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1
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1
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Carbon frame damaged? [duplicate]
I had a crash a couple of weeks ago with my BH Quartz. The front wheel got caught in a crack in the road, I heard a crack and I fell on the side. I was worried that the frame cracked, but couldn't ...
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Is it possible to prove that applied forces to a top tube are worse than a seatpost when using a repair stand clamp?
This stems from the idea that you should use a bike stand clamp on a seatpost, if you can, for carbon fiber (CF) bike frames. Hopefully, this would avoid the cracking of a CF bike frame.
In order to ...
5
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1
answer
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Shallow ring of death
By not servicing the headset for a long time (>10K km), I ended up with the so-called ring of death on the steerer tube. If you have never heard of it, watch this
...
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3
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Should I use fiber grip or grease when installing a bottom bracket into a carbon frame?
I am assembling my first carbon road bike and came across a question regarding on how to install the bottom bracket. I decided to go for this Ninja BBRight for my Cervelo Caledonia.
The Token's ...
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2
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1
answer
291
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Noticed a small scratch in the integrated crown race of my carbon fork. How fragile is this part of the fork?
I recently had to take apart the headset of my Cannondale Caad 13 road bike due to some clicking noises I wanted to diagnose. Therefore I also pulled out the fork a bit to inspect bearings and ...
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2
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Carbon Damage on bridge, repair possible? If so, what steps are needed?
This is a follow up question to:
Attachmentpoint rim brakes carbon bike, sratches/crack?
So. My bridge on my x lite 4 seems to be delaminating. Unfortunately Rose does not want to honor their six year ...
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How much does GT zaskar carbon comp cost? [closed]
So i checked the bicycle GT zaskar carbon comb and its prize was 22k rupees and in other websites it cost more. What is the real price and is there any GT zaskar carbon comp for 22k rupees
22k rupees =...
4
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4
answers
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Are cleat backing plates for protecting carbon sole?
I've just bought my first MTB shoe that has carbon sole. When I wanted to put on the SM-SH51 cleats, I saw that it has some claws, that would (in my opinion) damage the carbon sole of the shoe. So I ...
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Is the carbon frame disposal problematic
I heard from someone that carbon is difficult to dispose of. Does anyone know how
to dispose of carbon frames?
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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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8
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Do carbon MTB frames crack easily?
I have been looking to buy a new full sus mtb (Vitus sommet 29 Cr) and saw that the main frame is carbon fibre with the rear triangle being aluminium. I love the bikes specs and aesthetics but can't ...
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3
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Building a carbon gravel bicycle - Shimano 105 7020 vs GRX RX600/800
I've got into cycling around 2 years ago, mainly going to the office and cycling around the city/when traveling. Thing of 2 months ago started with long-distance and speed experimentation, and ...
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3
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2
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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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3
votes
1
answer
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Carbon rim depth - 44 or 56mm?
I'm looking for recommendations on carbon rim depth considering my use case.
Inner width is 23mm and I'll be running 32mm tubeless. For 3 season use in the UK, mostly on (rougher) roads - some hills, ...
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2
votes
1
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689
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Grease carbon fork before crown race installation?
I have a carbon fork, and a crown race that fits a sealed cartridge headset bearing. I know that in installation of crown races on metal steerer tubes, the use of grease is recommended.
I am wondering ...
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At what level of carbon fiber damage should you have it checked at your LBS?
Today I was clumsy and managed to hit my carbon fork against a fence while lifting the bike over it. There's just a tiny ding, almost not visible without a magnifier and superficial scuffs around it. ...
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4
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Glue for carbon fibre
Can anybody recommend a glue (perhaps a type of cyanoacrylate) for bonding carbon fibre?
I'm not looking for advice on how to do the repair itself. I just want to know what brand or type of product (...
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4
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Confidence in carbon bike frame after sealed bearing replacement
You buy a new bike. The bottom bracket makes a funny noise and needs replacing. For many other product categories (computer with a noisy fan, ...), you'd worry you had a lemon on your hand. It would ...
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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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3
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Can large bike size will be solved by replacing the crank arm with a longer length?
I recently bought a carbon fiber bike and the size is a bit big, it's sava phantom3.0 56cm ,but I love the bike and don't want to wait too long for small size bike, would a longer crank arm be a good ...
2
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1
answer
258
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Any help identifying a Focus carbon Izalco with SRAM Red?
Buying a bike from an online listing, and trying to find some information on it. I researched Focus's serial number formatting, but since the release of this bike it has changed, and the serial number ...
0
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1
answer
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Does carbon prevention spare a cure?
This site gets, with some regularity, questions wondering whether some
small damage to a carbon frame affects the integrity and the
safety of riding that bicycle. Here is a chronological sample:
01,
...
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2
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2
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Unsure if my carbon steerer got damaged from riding with stem attached in wrong position
I am worried that my steerer is damaged and don’t really know what to do, because I feel insecure riding my bike now. I hope maybe you can help me to determine what I should do.
I was at a bikefit and ...
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4
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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 ...
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3
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Carbon damage to frame after sideway fall
Today, I went out for a ride and had a small crash. I fell down sideways, then came home and realized there’s a small paint chip (which i’m fine with it) but there’s a small dot which is the deeper ...
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votes
3
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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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0
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3
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Should I upgrade my entry-level bike?
I bought a Cannondale Quick CX4 last year, but I’m not fully satisfied. I want something more robust, fast on the trail, and a better gear set. I’m still eligible to exchange my bike within one year (...
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Scratch in the very top of a new carbon steerer tube. Should I worry about this?
I just wanted to test lowering the stem on my new bike when I discovered quite an obvious scratch at the very top of the steerer tube. This is exposing fibers and inside the scratch feels a little ...
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1
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Should I do anything about this minor nick in a carbon fork?
Unfortunately I managed to smack a metal flashlight with quite sharp edges and a bit of movement force against my carbon fork when I wanted to check something on the bike. Although the damage is ...
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Are these abrasions problematic in a carbon fork dropout?
Got my first road bike with a carbon fork and when installing the front wheel the skewer slipped a little. Now I got some shiny surface lines there on the carbon surface. I wouldn't even call it ...
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2
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answer
449
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Brake residue on carbon rims
I have recently purchased 2nd-hand carbon rim brake wheels and noticed the front rim has what looks like residue from the brake pads stuck in a track the whole circumference of the rim, on both sides. ...
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2
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0
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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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Ultegra R8000 rim brake compatible with Zipp 303 Firecrest?
Update
I have successfully mounted a Zipp Firecrest 303 wheel set onto my Cannondale R800 CAAD 4 frame with Shimano BR-R8000 rim brakes. Thanks for the advice!
I would like to buy a carbon wheel set ...
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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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Carbon fiber frames and household heating/radiators: how close is too close?
I have a carbon fiber Giant Revolt that I keep in the hallway of my apartment, near the door. Opposite from where it's stored -- about 2.5-3 feet away, or one hallway width -- there is a hot-water ...
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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 ...
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