Questions tagged [repair]

Repairing your bike when something is broken. REPAIR is not the same as MAINTENANCE, a separate tag. Repair is what one does only when something is broken. Maintenance is what one does on a regular basis.

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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 ...
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7 votes
2 answers
287 views

Replacing worn pads worsens need for bleeding

I am faced with the most peculiar situation. An old XT brake(BR-M785) in some need of bleeding. I remove the worn out pads, observe no significant gunk accumulation, push the ceramic pistons back ...
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2 votes
0 answers
59 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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1 vote
2 answers
82 views

Mechanical Disk Brake Pads Too Thick

I decided to replace my front brake pads since they are worn out beyond function. So after removing the old pads, I made sure the piston was fully out, and the adjusting screw was fully tight as well, ...
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8 votes
2 answers
1k views

Two ill-repair bikes into one?

I have started a new job, cycling roughly 17 miles (or 27 km) each day into work. Previously, it was a very short ride (less than 2 km) into university. I have two bikes that are currently falling ...
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13 votes
4 answers
4k views

Rear tire gets flat every month for unknown reasons

My rear tire gets flat almost every month without any obvious reasons. Few times it lost the pressure while riding but I do not see or remember puncturing it, and once it was on a good tarmac street ...
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3 votes
1 answer
90 views

Shimano Ultegra shifters 8020 bottom plastic cover screw. Where to get it?

Does anyone know the specs of the screw of part #7? Or where to get it in US? It unscrewed and got lost. I think I might find something similar not bike-specific.
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4 votes
1 answer
235 views

Brake pads keep getting contaminated - how to diagnose?

My bike uses Shimano hydraulic disc brakes. I can't find any markings on the calipers or handles, but the manufacturer's website says they're BR-M315. Over the past few months I've had issues with the ...
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  • 353
3 votes
2 answers
82 views

My old BB has a little play. Is it normal? Can I still run it? for how long?

My threads from the crankset were gone, had to cut all crankarm with iron cutter in order to be able to extract the crank arm. But before that, I gave some hammer strikes to it trying to get it out. ...
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3 votes
2 answers
393 views

Do split frames for belt drive bikes need special screws?

I have a belt drive Cube bike, and the frame is Aluminium. The rear triangle has a split to accommodate the belt, there's a screw right above the rear sprocket, on the right side of the bike - see ...
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  • 353
5 votes
1 answer
312 views

Brake and chain problems after a muddy ride (ed. note: suspected chainsuck)

Recently I went for a ride, and it was a very muddy one. I blatantly misjudged the depth of a puddle and submerged half of my bike (and myself) in muddy water, including the chain and front/rear disk ...
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12 votes
1 answer
899 views

How do I rebuild Shimano XTR brake levers?

My right brake lever (Shimano BL-M9020 to be specific) has attracted some dirt around the blade pivot area, and some parts look shiny. I suspect the master piston seals are starting to leak. Replacing ...
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4 votes
1 answer
127 views

SRAM GXP crank partially stuck in bottom bracket

I (unfortunately) have a SRAM Apex GXP crankset that I need to replace after less than a year of use because it's garbage. But I can't get the crankset out of the bottom bracket. I've taken the bolt ...
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2 votes
4 answers
210 views

What's the point of tyre boots?

The title is a little provocative, but how often are they actually useful? Only once in 4 tyre failures would a boot have helped, when I nicked the sidewall on a cattle grid with a rough weld, making ...
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7 votes
3 answers
216 views

Rear wheel thru axle with no lever

I have a Cube Attain Road, but the rear thru axle puzzles me! I want to remove the rear wheel in order to attach the bike to a Wahoo Kickr 5. How do I get the axle out? When I unscrew the bolt I ...
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  • 101
3 votes
2 answers
112 views

Removing Nexus 8-speed IGH from hub shell

I'm trying to remove my Nexus SG-C6001-8D from its hub shell to grease it. Sadly Shimano's documentation doesn't cover the process of extracting the internals from the hub shell. The info I can find ...
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  • 353
8 votes
2 answers
398 views

Gates CDN - frequent belt failures

I ride a belt drive bike fitted with a Gates CDN front sprocket (on the crank), a CDN belt and a CDX rear sprocket. Around the 2200km/1400mi mark, the CDN belt failed and teeth started snapping off (...
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  • 353
2 votes
1 answer
114 views

Broken bottom bracket spindle on spinning bike?

So my spinning bike bottom bracket spindle (axle) broke. Anyone know where can I find a replacement? Here is an image and video of broken part
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8 votes
8 answers
3k views

Are there limitations to how much you can upgrade a cheap bike?

I’m hoping to buy a used bike for ideally 200 Euros and make it a hobby project to keep investing in the bike piece by piece to make it a nice bike, upgrading one component at a time when I can afford ...
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3 votes
1 answer
77 views

repairing Meidai Top pump?

I've got a very old MeiDai Top floor pump, like this picture ... It suddenly stopped working, no resistance whatsoever from the plunger. I'd like to repair it. So far, I bought this "741" ...
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2 votes
2 answers
130 views

Structural Stability of Carbon Rim

I recently purchased some carbon rims for my road bike and there appears to be some buldging forming around the rim. I'm no expert in carbon fibre and I was wondering whether the wheel is still safe ...
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2 votes
3 answers
691 views

Bike back wheel came loose a bearing fell out, safe to wheel to repair shop?

Had my back wheel come loose during a ride, and when I was pushing the bike one of the bearing balls fell out from the axle area I assume. Is it safe to push the bike to repair shop and how much ...
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8 votes
4 answers
968 views

Cannot put a tire whatever I do

I cannot put a replacement tire on my rear wheel, whatever I do, have spent half a day on this. It just should not be so extremely difficult, I have tools and it is not the first tire I am replacing ...
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  • 3,522
5 votes
1 answer
459 views

Replacing inner tubes & tires - tube seems too large for tire

I inherited an older road bike from my sister that I wanted to fix up for my daughter. The tires and inner tubes needed to be replaced. The existing inner tubes were old and faded, but I could read a ...
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0 votes
1 answer
93 views

Carbon Bike Frame Chip At Rear Wheel [duplicate]

I was wondering if this is fixable?
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9 votes
1 answer
189 views

Has anyone successfully changed the battery in a Knog Blinder Mini Dot?

I have a pair of Knog Blinder Mini Dots which were left with their non-user-replaceable LiPo batteries flat over winter and now won’t take a meaningful charge. I’m handy with a soldering iron but less ...
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3 votes
2 answers
347 views

Old Motobecane pedals without bolt on axle - How to remove?

I took off some old pedals from a motobecane frame. I wanted to change the bearings but figured out there is no bolt. I have looked everywhere but can't find the model and how to remove it. I thought ...
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9 votes
7 answers
3k views

Worth repairing?

I’m a complete noob getting back into cycling after 15 years of not riding. And loving it! But I bought a bike about 4 years ago and started using it and now it’s got a heap of problems, which I've ...
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0 votes
2 answers
147 views

My bicycle's rear shock is clicking and making a squishing noise. Do I need a new shock or does it just need to be tuned?

I bought a used bike and on the first day, it made a small clicking noise whenever it came back up fully. It also made some squishing noises whenever I compressed it and whenever it started ...
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  • 203
1 vote
2 answers
80 views

I can't find that specific part (Lasco cf-58 d-11 170) , is there any other crankset that would fit my bike?

I am trying to repair an old bike of mine to gift it to a friend. One of the pedal arms has broken off so I am looking to find a replacement part that I can swap for the old one. The model of the ...
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2 votes
2 answers
170 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 ...
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1 vote
1 answer
85 views

Gear slipping on Cannondale Habit

I have a Habit ebike with 1,700 kms on it. I was having slippage on gears and my bike dealer fitted a new chain and new cable but now it is worse. When looking at the derailleur in the 2nd gear from ...
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3 votes
5 answers
2k views

How much wobble is too much?

My back wheel has a really small wobble maybe a millimeter of movement if you push it sideways, it is barely noticeable but you can definitely feel it. Should the wheel be completely solid or is a ...
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1 vote
1 answer
117 views

Rear wheel wobble in a geared bike

I have a Bike with gears. The rear wheel started wobbling a few weeks back. At first my chain kept getting off every now and then and I couldn't figure out how to fix it permanently. So I stopped ...
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7 votes
1 answer
2k views

Is it safe to ride the carbon bike with a small crack on the bottom of the chain stay? Looks cosmetic but fails the tap test

The chainstay cracked after air travel. Update: I have brought the frame to a carbon repair shop for repair. The cost would be 500ish, including the touch-up paint. Tips for future flight travelers: ...
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0 votes
0 answers
77 views

Should I change Damper body of SR Suntour XCM Fork

I've disassembled the fork and checked the "Damper body" whether it was working correctly. It sounded a little bit strange. but I am not sure whether it was OK. The reason for disassembling ...
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  • 163
0 votes
1 answer
53 views

Stuck/stripped plastic cap - Rock Shox Judy 1

I'm servicing a Scott Reflex 40- I suspect 2006 model (bought 2nd hand), with Rock Shox Judy 1 front forks. I can disassemble the RHS (facing the shocks) but the LHS I am unable to remove the plastic ...
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  • 113
1 vote
0 answers
217 views

How to fix Shimano E7000 Error 010?

Can anyone guide me to clear the E010 error code on a Shimano E7000? I tried all the steps according to the manual but can't resolve them.
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5 votes
1 answer
890 views

Dent near bottom bracket on vintage steel frame

I just bought myself an old vintage Koga Miyata and just realized today that there's a weird dent on the frame near bottom bracket. Is this something I should be worried about? Or is it normal with ...
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1 vote
1 answer
248 views

Water bottle rivnuts preventing dropper post getting low enough, carbon frame

I didn't realise this bike had a second set of drink bottle bolt holes on vertical length of the front triangle, they're stopping the seat post getting as low as I would like it. If I drill the ...
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10 votes
2 answers
788 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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9 votes
2 answers
2k views

What are the risks associated with truing wheels without the aid of a truing stand?

About six months ago something got caught in the spokes of my back wheel. The wheel was functional, but visibly untrue. I took it home and trued it with a spoke key, continually adjusting the rim ...
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3 votes
2 answers
478 views

Fixing helmet padding

I was trying to remove the helmet padding to wash it and the two layers separated. Instead of replacing the helmet which is wastful, can anyone suggest ways (non-toxic glue?) of repairing the padding?...
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  • 153
0 votes
1 answer
65 views

Fitting a new tyre and cassette

Hello I recently had one of the cogs on my cassette snap due to lack of care on my side obviously (the smallest one). This occurred due to my chain skipping and putting an unfortunate amount of force ...
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0 votes
1 answer
70 views

Tyre not aligned with rim [duplicate]

So I just replaced my bike rim since the spokes & hub were way too old. I go on and and install same tyre but with new inner tube - so essentially only things that changed are rim and inner tube. ...
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6 votes
2 answers
1k views

Post crash damage assessment: can I keep this carbon fork and this front wheel?

Today I crashed. I had to slam the brakes hard downhill as to avoid a worse crash. Split second decision, it's the way I explain it. As a consequence I went over the handlebars. Landed not too poorly, ...
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5 votes
2 answers
768 views

What is correct procedure to remove freehub body?

I want to replace a defective freehub body and I am confused on how I should unscrew it from the hub. This earlier question (Cannot remove freehub body) explains which direction to go between CW and ...
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13 votes
11 answers
2k views

Does anyone patch inner tubes anymore? [closed]

Many years ago I bought a 100 pack of REMA round patches from Amazon. And back then you could buy patch kits for $1 that had a few patches, something abrasive to sand with, and a tiny tube of ...
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  • 167
0 votes
2 answers
166 views

Sidewall cut on brand new tyre - permanent fix possible?

I bought a new set of tyres (Continental Grand Prix 5000). Being an idiot, I managed to cut the sidewall of the tyre with a knife while removing the packaging. I have looked at repairing it, and came ...
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1 vote
1 answer
166 views

Front wheel twist and move in dropouts when braking or on aggressive turns

I discovered that my front wheel moves on the dropouts. I have searched the web to know why? But most of answers was "replace quick release and problem gone" so I replaced the quick-release ...
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