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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176 views

Spoke tension - is a left tilt ok to prevent explosion?

The left hand steel blade spokes of my WH-RS30 (not 30A) are constantly exploding inside of the nipples when going up hill in a standing position. I have increased the right hand side tension to about ...
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1answer
233 views

repair scratches on surly frame

I am a happy owner of a Surly Cross Check frame, two years old. Today I put it against a pole, but a strong wind blow made it slide along the pole and fall to the ground. As a result, there is one ...
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2answers
286 views

Bottom bracket cup doesn't fit on non drive side

I'm replacing the crankset and bottom bracket on my old steel frame road bike, which looks like this one, so I'm guessing it's from around 1985. I picked up a 68 mm square taper bottom bracket and ...
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2answers
454 views

How can I remove the bottom bracket from this old road bike?

I need some help removing this bottom bracket. I am obviously no mechanic, and watching several videos on youtube I found nothing that could help in this specific case. Basically after removing both ...
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1answer
243 views

What tool is needed to adjust this headset on a children's bike?

My daughter's bike has a threaded headset, and I don't know what tool I need to adjust it. As you can see from the picture, there are the following parts in the stack: a knurled ring, which ...
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1answer
132 views

I'm worried about my derailleur snapping. The chain isn't running around the bottom pulley, it's running next to it

I'm worried about my derailleur snapping. The chain isn't running around the bottom pulley, it's running next to it, scraping against the bottom pulley and the frame. When I change gears it makes a ...
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2answers
1k views

How to fix a stripped pedal crank

The threads on my bike's pedal crank just became fully stripped and the pedal fell off, though the pedal itself is fine. Is there any way I can fix this without fully replacing the pedal crank?
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1answer
136 views

How to replace a tube with only one quick stick?

So what is the correct number of quick sticks to swiftly change the tube? I had always thought that the answer is of course 2, but : I can do it twice as fast with one Quik Stick as you can with a ...
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1answer
86 views

Rim cement as a replacement for rubber cement

Can I use aluminium rim cement for patching flat tire instead of using rubber cement?
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3answers
471 views

Cost of maintenance of a roadbike

I am going to buy a bike and ride upto 1000 km or more in a month. Adding them, I think it will come to 12 k to 15 k per year on an average. I will be riding on highways, so there won't be any ...
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1answer
347 views

Is there any replacement for the chainrings of a Shimano STX crankset?

I have a Shimano STX Crankset (probably FC-MC series or similar, around 2001) with worn out chainrings (5 Arms). Is there any contemporary replacement opportunity for either the chainrings or the ...
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7answers
1k views

What tools on a multi-tool do I actually need?

I feel like there are almost as many bike multi-tools out there as there are bikers. In a single trip to REI, I found nine different bike tools each ranging from only four to over thirty individual ...
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2answers
369 views

Rear derailleur and front shifter are not indexing “together”?

So my rear derailleur and front shifter have stopped working together, my shift can shift once up and then nothing. My bike has essentially turned itself into a 2 speed. The shifter is a 2300 shifter ...
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1answer
182 views

FC-M330 replacement

I have a Trek 4500 with a Shimano FC-M330 crankset. I need to replace the crankset and was hoping that someone could tell me the current replacement. I believe that I have narrowed it down to the ...
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1answer
94 views

Is it ok to use a 9spd link on a 10spd chain?

I accidentally broke the master link (a.k.a reusable missing link) on my 10psd KNC x-10 chain. Since I only had a SRAM 9spd replacement link, i used that to connect the chain. I rode 30 Km without any ...
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2answers
288 views

What is the largest hole a tire can bear before replacement?

Saw this question today. The tire in question has a 2cm long hole on the inside, from a knife. I sometimes get puncture flats from e.g. glass. Never as big as 2cm. Usually if they're less than ...
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3answers
114 views

How to repair shifter housing

I have shifter with damaged housing. It shifts well, but I guess if housing is not repaied, rain and elements will quickly put an end to it. Which material would be suitable to fix this hole? Epoxy ...
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1answer
254 views

Can I replace a 1/2 inch bolt with a 14mm one to secure my axle?

My front wheel is secured with 14mm bolts, while my rear wheel uses 1/2 inch bolts. Turns out my multitool has only a 14mm wrench, so I can't change the rear tire with it. Rather than carrying ...
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1answer
315 views

Rear internal hub won't shift gears

I have a 1963 Sears cruiser, three speed, which I bought very recently. On my third ride, the middle speed stopped working, and went loose; there wasn't any "traction" when I pedaled. It happened as I ...
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2answers
232 views

Fixing Carbon Fiber

I have a Cervélo S2 and absolutely love my bike. It has been rock solid. Unfortunately, I had a bad case of chain suck when my chain fell off my chain ring right when I was grinding up a hill. The ...
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5answers
569 views

How can I repair a swollen tire allowing visibility on the inner tube (picture provided)?

I have a new problem on my bike which occured after patching my inner tube. Since I put the patch on, my tire is pushed out away from the rim near the intake valve (not near the patch). In the picture ...
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1answer
152 views

Size of Pedal Threading on old German Glockenlager?

I removed the pedals of a Göricke bike from 1934 or 1935 (according to the bike number). It has a Glockenlager (What is that in English? Bell shaped bottom bracket?) as seen in the picture. The crank ...
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1answer
405 views

What to do about a stuck chain link on 10 speed chain

I put a new chain on my bike and after 3 rides or so, I developed a stiff link. I'm not sure what caused the issue, but now it barely bends at the pin at all, unless forced. It causes skipping ...
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2answers
604 views

Are aluminum or steel chainrings more resistant to bending?

I mash a lot and wind up killing chainrings. I later find that my chainring warps at the midpoint between two chainring bolts. Usually my first sign that something is wrong is my chain pops off or ...
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2answers
1k views

Can I use a shock pump to inflate a tube?

I know that shock pumps are meant for high pressure applications so that they can withstand high pressures needed by suspension shocks. However, can I use a shock pump to inflate my tire in a pinch ...
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4answers
927 views

How can I properly replace the hose on this older Schwinn pump?

I have the following Schwinn bike pump. It’s pretty old, perhaps 30 years or more. I like it a lot. Some years ago, I changed to Presta valves; for this I needed a new head. I got a Topeak ...
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3answers
166 views

Refitting Cable to Rear Derailleur

Whilst riding recently the cable slipped from the clamp on the rear derailleur. I'm attempting to affect repairs by re-clamping the cable. However by pulling the cable tight I have lost the bottom 2 ...
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3answers
860 views

Shimano Hollowtech left crank arm getting loose

After 2 years of good use, left crank arm on my FC M542 crank set has started to get loose quite often (cca 500 km). It is usually indicated first by few now an then click-clanks somewhere in the ...
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1answer
312 views

Should cassette “wiggle”

Recently My freehub broke and so I removed the cassette to replace the freehub and noticed, whilst off the bike, 4 of the remaining bolted together 8 sprockets wiggled (4 wiggled together but ...
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5answers
4k views

How can I tell if a rim is bent or if the wheel is just out of true?

How can I tell if a rim is bent or if the wheel is just out of true?
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3answers
1k views

how to repair large holes in inner tubes

I find that any hole, cut or tear larger than a pinprick is impossible to repair with normal patches because they are too soft. Even a 2-3mm slit will cause the repair patch to balloon out and burst ...
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1answer
403 views

How do I re-attach a crank that has fallen off?

I have already read My crank fell off, how do I re-attach it?, but it did not answer my question. I was biking up a hill in first gear, and I felt my left crank was a bit loose. Never having had ...
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1answer
178 views

Do I need to get a replacement bike for this broken chainring?

I wanted a cheap commuter bike, and just received this bike from Amazon. I have little knowledge about bikes, but looks like the middle chain-ring is broken to me. Is this indeed broken, or is it ...
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2answers
866 views

How to reassemble spring assembly on Shimano M520 SPD pedals

I have a pair of shimano m520 pedals which were damaged in an accident. The springs rotated past the tension bolt and now the back section, usually under tension, now hangs free. How can I ...
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3answers
356 views

Failing to unscrew BB - what now?

I have an external bearing BB, that I need replaced (It is quite badly rusted). I opt to do the repair myself. The bike is a Specialized Hardrock, the crank arms are SR Suntour. Having removed the ...
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5answers
502 views

Six speed chain on an eight speed bike

So in the shop they asked me "what chain do you need" and I said 7. They said "you could try this 6-speed, it is half the price of a 7, and we put it on 7-speeds all the time". I said "ok", only to ...
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3answers
747 views

Front derailleur sticking, not shifting. Will soaking in solvent damage parts?

I've got an older deore lx front derailleur for a mountain triple crankset. It wasn't shifting properly, and it seems that it's sticking and not returning back to a neutral position when I shift it. ...
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1answer
206 views

There is a lip on my brake pad from bad positioning. Can I remove the lip?

One of my bikes had the brake pads positioned poorly and they developed a pretty pronounced lip where the pad hung off machined braking surface on one side. The bike is using cantilever brakes. These ...
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2answers
2k views

Is it possible to repair a dent on an aluminium frame?

I have Centurion Cyclo Cross 4000 bike. Recently I got into an accident with a car door. As a result I have a significant dent on my frame(see the photos below). I have two questions: Is it ...
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2answers
1k views

how do you make a chain longer with a simple chain breaker?

I was replacing a chain and managed to cut the chain too short. Is it possible to make the chain longer using a simple chain breaker? If so, how?
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2answers
5k views

How do I determine the model of my Shimano Rear Derailleur?

I recently damaged my rear derailleur and am trying to find the replacement online. It is a Shimano Tourney SIS Index. I have found several models in the Shimano website that are pretty close ...
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2answers
225 views

the derailer is touching chain and it won't let me go past 14 speed supposed to go 21 speeds

The derailer on my 21-speed bike looks like it's bent. It won't let the chain go onto the 3rd ring of the front derailer so, no I can't shift past the 14th speed. If I try it makes a loud sound, like ...
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3answers
659 views

How exactly are pedals attached to crank arms?

Recently I tried to unscrew the left pedal of a bicycle by turning it counter-clockwise with a spanner lengthened with a piece of pipe. The net result is the spanner broke apart and the pedal is still ...
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1answer
1k views

Front brake lever will not stay tightened

I have a 2011 Trek Cobia with Hornet brakes. About an hour and a half into my trek through the woods this morning I noticed that (once again) my left brake lever was hitting my knuckle when I fully ...
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1answer
481 views

pedal falling off axis

One of the pedal arms in my bike is loosening off the crank every so often. When it starts to happen, the pedal arm, that has square ends, and the nut will end up detaching from the crank, so I have ...
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2answers
243 views

What do I do when I don't trust my LBS to repair a problem they caused?

I have a Sturmey Archer 3-speed hub on an ex-single speed. I got a flat on my way to work and couldn't ride any more. So I jumped on the train and took it to the bike shop near work (the shop who ...
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1answer
415 views

Front derailleur doesn't change from grear 1 to gear 2

I have a Shinamo Tourney front derailleur that doesn't change well from gear 1 to gear 2 (I'm new to bicycles so I don't know standards, so I think I should specify that gear #1 is the smallest). In ...
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1answer
1k views

How to determine size of freewheel?

My previous question was: How to take apart this rear BMX hub? How do I determine the size of my freewheel to replace it? I have seen on bicycle sites that a freewheel comes in sizes like 14t, 16t, ...
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2answers
2k views

How to take apart this rear BMX hub?

As shown in the photo, what tool do I need to take this rear hub apart? I assume I need a tool which will fit in the 4 notches. The problem I am trying to fix is that if you pedal, the rear cog spins ...
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2answers
357 views

I was in a collision the other day. What should I check?

I was making a left hand turn the other day when a u-turning vehicle t-boned me. I somehow managed to land on my feet, but the bike didn't fare as well. It landed on the drive side. My back wheel ...