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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What type of bike is this? Brand?

I found this bike and I don't know anything about bikes but I was hoping to figure out a brand for it. Also, it doesn't have working breaks; I want to repair the brakes myself but I don't know where ...
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2 votes
2 answers
95 views

Montague FIT folding bike with “snaking” frame

My 2012 Montague FIT folding bike has started to “snake” especially when riding at speed downhill. I have tightened the frame quick release and inspected and tightened the pivot nut but the snaking ...
4 votes
3 answers
470 views

Is 3mm tubeless puncture too big to seal?

I have a small slit in my MTB tyre (approx 3mm long x barely 1mm wide) which won't seal. I had to put a tube in when the puncture happened as it wouldn't seal, but I've now taken the tube out, cleaned ...
5 votes
4 answers
657 views

Burley trailer - Repair cut in plastic window

I am looking for a way to repair a cut in the plastic (polyurethane?) window that serves as a rain/wind guard on a Burley trailer: I do not care if the fix is ugly or isn't see-through like the ...
0 votes
0 answers
35 views

Tube size inquiry for my bike

I’ve taken out the old tube which measures 700x35 45c but I could only find 700cx35 38. Will this fit ok? Many thanks
1 vote
1 answer
70 views

Broken screw thread on GRX 800 crankset

I made my gravel-dream bike few month ago by hand. I followed all the user-manual sheets from Shimano in order to properly mount the GRX 800 crankset and the pedals on it. I respected the tightening ...
  • 103
1 vote
0 answers
30 views

J.c higgins bike [closed]

I also have the.model #, 50545120 and serial # 0408039. I would like to find out any info please.
15 votes
11 answers
5k views

As an enthusiast, how can I make a bicycle more reliable/less maintenance-intensive for use by a casual cyclist?

The details of this question may end up being quite specific to my exact circumstances, but I think the information presented in the answers will still be usable and interesting for the general case. ...
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1 vote
1 answer
71 views

How to get my hydraulic disk brake working again?

I have a bike with a hydraulic disk brake and have been observing some degraded performance recently. Yesterday I finally had a close look and noticed that one brake pad permanently touches the rotor. ...
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4 votes
1 answer
156 views

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. ...
3 votes
1 answer
137 views

Because of a pedal rattle and squeak should I remove my pedals off and how?

The pedals are little rough and rattle quietly. The spindle creaks sometimes. It is not so much its condition but rather that it fail that worries me. I see no way to get the pedals off separately ...
0 votes
3 answers
146 views

What should I put in a bicycle emergency patch kit for situations more severe than a common puncture? [duplicate]

If my bicycle breaks such as my spoke failure which lead to total tube rupture (but it could lots of possibilities) and I don't have any means to have whole bicycle carried, how can I achieve a ...
2 votes
1 answer
85 views

How do I fix an Avid BB7 Outboard Pad that Doesn't Retract?

A friend came by with a Bike Friday with a rear BB7 disc brake that no longer worked at all. The adjustment was way off, a result of the undiagnosed fact that the outboard pad wasn't retracting ...
2 votes
1 answer
113 views

Can a broken ratchet in Shimano Tiagra 4600 rear shifter be replaced?

It looks like the ratchet mechanism broke in one of my shifters. As I try to shift the bit holding the end of the cable stays put and does not follow the lever. Even when it moves I can then pull by ...
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 ...
7 votes
2 answers
302 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
63 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 ...
  • 121
1 vote
2 answers
115 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, ...
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 ...
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 ...
  • 4,758
4 votes
3 answers
269 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
491 views

Brake pads keep getting contaminated - how to diagnose?

(see update at the bottom) 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 ...
  • 377
3 votes
2 answers
87 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. ...
3 votes
2 answers
461 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 ...
  • 377
5 votes
1 answer
317 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
2k 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 ...
  • 11.8k
4 votes
1 answer
197 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 ...
2 votes
4 answers
262 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 ...
  • 48k
7 votes
3 answers
329 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 ...
  • 101
4 votes
2 answers
218 views

Removing Nexus 8-speed IGH from hub shell

see update at the bottom 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 ...
  • 377
9 votes
2 answers
656 views

Gates CDN - frequent belt failures

update at the bottom 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 ...
  • 377
2 votes
1 answer
164 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
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 ...
3 votes
1 answer
100 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" ...
2 votes
2 answers
160 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 ...
  • 121
2 votes
3 answers
829 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 ...
  • 1,219
9 votes
4 answers
991 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 ...
  • 4,758
5 votes
1 answer
503 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
172 views

Carbon Bike Frame Chip At Rear Wheel [duplicate]

I was wondering if this is fixable?
9 votes
1 answer
306 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 ...
3 votes
2 answers
387 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 ...
  • 191
0 votes
2 answers
230 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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1 vote
2 answers
108 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 ...
  • 13
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 ...
1 vote
1 answer
98 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 ...
3 votes
5 answers
3k 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 ...
  • 1,219
1 vote
1 answer
139 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 ...
7 votes
1 answer
3k 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
167 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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