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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3
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1answer
98 views

Rim cement as a replacement for rubber cement

Can I use aluminium rim cement for patching flat tire instead of using rubber cement?
5
votes
3answers
616 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 ...
13
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7answers
2k 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 ...
1
vote
1answer
419 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 ...
2
votes
3answers
988 views

Vibrations in frame when pedaling

Recently, when I pedal sufficiently hard, I begin to feel vibrations through the whole frame of the bike. They are not so strong as to make the bike un-ridable, but neither are they road chatter. I ...
1
vote
1answer
237 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 ...
1
vote
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 ...
4
votes
2answers
359 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 ...
3
votes
3answers
124 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 ...
1
vote
1answer
312 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 ...
2
votes
3answers
449 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 ...
3
votes
1answer
466 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 ...
2
votes
2answers
240 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 ...
8
votes
1answer
5k views

Chain slipping off derailleur jockey (need suggestions ASAP)

Last week, I had to abandon a training ride due to my chain slipping off my rear derailleur jockey. This would only happen when shifting, and most often when either shifting chainrings or shifting ...
0
votes
5answers
699 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 ...
5
votes
4answers
2k views

Sources of vibration at high speed in and around rear wheel

I’m experiencing vibration somewhere in the rear half of the bicycle when descending at high speed (say more than 30 mph), and I haven’t been able to pinpoint the cause. Everything looks fine, ...
4
votes
1answer
467 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 ...
1
vote
2answers
740 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 ...
4
votes
3answers
283 views

How to remove broken bolt in Chain Tug?

It is now stuck very hard because I used apparently too much force to tighten it, how would you take that out? The bolt is in soft aluminium frame so it can be quite tricky thing to do. Some bolt ...
7
votes
6answers
10k views

brake lever will not return

My friend has a mountain bike that survived last years Queensland's floods (Australia, that is), but is all battered and bruised after not being ridden for a year. With my beginner's repair skills, I ...
1
vote
3answers
194 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 ...
4
votes
1answer
371 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 ...
4
votes
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 ...
8
votes
5answers
5k 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?
10
votes
4answers
945 views

Are bicycle helmets repairable or disposable?

Suppose I wear a bicycle helmet, and I fall hard and my helmet cracks. Do I buy a new helmet or can I try repair the old one with some glue?
2
votes
1answer
494 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 ...
2
votes
5answers
642 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 ...
4
votes
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?
1
vote
1answer
2k 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, ...
3
votes
3answers
877 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. ...
5
votes
1answer
219 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 ...
13
votes
9answers
8k views

Patch or replace tube?

Is it worth patching a tube on a mountain bike, or just replace it with a new one? There are a lot of 1/2" - 3/4" thorns here in Texas, and I use 26 x 1.95 tubes. Any particular patch type/brand ...
10
votes
2answers
3k 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 ...
9
votes
2answers
462 views

What should I do to get an older bike into good condition

I recently bought a hybrid human/electric bicycle at a garage sale, and I've been working on getting it into usable shape again. It is about 10 years old, and needs some work. The battery was quite ...
12
votes
7answers
267 views

Riding Repair Kit

As most of my riding is limited to intra-city commuting (on bus routes) or on bike paths, I have not really faced a dire need for a repair kit while riding. I am looking into pulling off a three hour ...
2
votes
2answers
6k 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 ...
-1
votes
2answers
233 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 ...
2
votes
3answers
721 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 ...
11
votes
4answers
11k views

Removing a stuck pedal

I'm sure this question must have already been answered somewhere here, but it doesn't show up in any search results I make... I'm changing the pedals on a 40 year old bike. Pretty sure the pedals are ...
2
votes
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 ...
3
votes
3answers
6k views

When do bearings need to be replaced?

How do I know when bearings need to be replaced? Should I go by time? Or is there a symptom to guide me?
3
votes
3answers
2k views

Is my local bike shop asking to much money to change a rear cog?

I normally have much love for my LBS, but I've moved recently and am a little unsure about this new one due to the fees he is asking. I have a flip flop hub with a fixed gear (18 tooth) cog on one ...
10
votes
7answers
15k views

How to remove a crank arm with stripped threads?

A friend called me up yesterday after a mis-adventure during his attempt at a bottom bracket overhaul. He stripped out the threads on the (left) crank arm while using a Park crank puller. In a pinch, ...
7
votes
2answers
252 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 ...
0
votes
2answers
267 views

RS Revelation '11 dual air fork leaks

I have a RS Revelation dual air fork. It's new, never used before. I installed it and after a few days I noticed, that it loses air. Maybe 20-30 psi over night. So at morning it's just too soft and ...
0
votes
1answer
564 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 ...
11
votes
13answers
2k views

What are the most important things to bring on a ride?

On one of my recent ride, my bike broke down. My rear derailleur got pushed into the rims and broke. Since I have never gotten stuck like that before, I've never bothered to take anything with me ...
2
votes
1answer
474 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 ...
3
votes
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 ...
8
votes
2answers
365 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 ...