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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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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3answers
338 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 ...
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3answers
364 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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1answer
708 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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3answers
4k 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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4answers
1k 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?
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1answer
1k 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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5answers
2k 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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2answers
4k 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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1answer
3k 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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3answers
2k 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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2answers
9k 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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675 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 ...
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2answers
14k 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
265 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
1k 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
2k 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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3answers
20k 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?
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2answers
277 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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2answers
360 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 ...
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1answer
897 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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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 ...
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1answer
865 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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2answers
5k 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
454 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 ...
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13answers
578 views

What tips do you have for making temporary “get me home” repairs?

I do some mountain biking in remote parts of wales. I usually carry a minimal tool kit: pump, spare inner tube, and multi tool. I'm wondering if you have any temporary 'get me home' repair tips I ...
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4answers
614 views

What to Look for In a Fixer Upper

I have decided to buy an older worn down bike and fix it up as my commuter. What things should I look for? I know I should check the frame for rust. But, that's about it. For example, is it easy ...
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2answers
138 views

How can I find inexpensive salvage repair (frame) parts?

I've got a 2008 or 2009 Titus X. I cracked one of the struts (probably the wrong term) in the rear suspension triangle. I'm hoping I can find a salvage part (still waiting to see how expensive a new ...
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2answers
2k views

I assambled rear wheel hub, but now rear wheel is not turning freely

I disassambled/assambled rear wheel hub, but now rear wheel is not turning freely, what have i done wrong?
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3answers
3k views

Best practice for patching snakebite pinch flats on skinny tubes

So, I tend to run 700x23c or 700x25c tires on my commuter bike. Sometimes I'm lazy and forget to check the air pressure and inevitably get a pinch flat when I hit some stationary object, pothole, or ...
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1answer
275 views

Unused puncture repair patch - what's its useful shelf life?

Sometimes I fish around in my shed for a repair kit and pull out a pair of patches which have been sat around for a while (a year?) I find the patches are stiff (even though they're still in their ...
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0answers
41 views

What sort of bike chain do I need for my bike? [duplicate]

Possible Duplicate: How can I tell which size chain my bike uses? I have a vintage Ross road bike, and the chain recently snapped during one of my rides. The bike has 2 gears in the front ...
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1answer
509 views

Clicking gears on new Electra Townie 8i

I asked a similar question related to slipping gears here: Slipping gears on new Electra Townie 8i but now I no longer get slipping, but clicking noise when the pedals are rotated either forward ...
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4answers
3k views

LBS said creaking under torque is normal?

on my last question i asked about a creaking/tick i was getting when i was stand pedalling on a climb. I took it to my LBS today and they said they had stripped all the crank and bb and re greased it ...
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4answers
2k views

Strange noise coming from bottom bracket/crank? any ideas?

ive just bought a trek 6300 and im getting a strange creaking coming from the crank/bottom bracket when im stand pedalling. it only happens when im stand pedalling, and only what appears to be on my ...
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2answers
1k views

Maintenance/Upgrades for Gary Fisher Joshua MTB

Let me start from the beginning: About three years ago, I broke my leg after buying a Gary Fisher Joshua MTB, when I was just getting into road and cross-country riding. I've only started riding ...
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3answers
10k views

Adivce on what to do next with crunching / slipping gears

About two weeks ago I took my bike to the local bike shop to get serviced. It was previously slipping gears under load and at the end I couldn't use the lowest gear going up hill it would just slip ...
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2answers
1k views

Does a hybrid truely have a wider tire or does a mountain have a wider tire?

I'm looking around my local bike shop and saw that the hybrids have a slim tire while a mountain has a more fatter tire. And when i researched it says the opposite. Please help me.
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1answer
1k views

Bottom bracket repair stand experience

Does anyone have direct experience with the ParkTool Team Race Stand or other brands/models of bottom bracket repair stands? If so, do you like it and why? A good answer for me will include the ...
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2answers
664 views

Small amount of wobble in wheel

If I grab my [suspension] forks tightly and push against the wheel sideways, there is a slight amount (few millimeters on 26" wheel) of play/wobble from the axle/hub. The QR is done up tightly. Is ...
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4answers
5k views

My crank fell off, how do I re-attach it?

I was out riding on my mountain bike when my crank unexpectedly fell off (video). How do I reattach the crank? There's a torque range specified (25-30 Ft-Lbs): how critical is this? I don't own a ...
3
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2answers
1k views

Repair superficial damage to a carbon frame

I have a carbon frame with an integrated seatpost. The saddle sits on a clamp that is meant to secure the saddle on the seatpost and NOT hold the weight of the rider too. I went on a ride and my knees ...
3
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2answers
789 views

Possible to repair a pushed in braze-on?

I have a Trek 7200 (Alpha aluminum frame) and it has two water bottle holder mountings, the top braze-on on the seat tube seems to have broken from over-tightening and has sunk into the frame. These ...
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3answers
2k views

Where is the proper location to measure the tube size?

I need to replace a tube in my bike. I know there are many tire sizes. I bought 26', assuming that my bike was that size, and realized when I got home that I didn't even know where to measure from. ...
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3answers
446 views

Shaky Freewheel

I posted a question some time ago about vibrations in the frame of my road bike (a 1973 Sekine). Recently, I determined that the rear wheel is sliding back and forth across the axle, with about 0.5cm ...
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3answers
732 views

What am I supposed to do when my chain falls off?

It happened when I "stepped on it" (on an empty residential street). It left the chain on the road. What tool(s) and parts should I have had with me, to fix it? It was replaced (new) two months ago, ...
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4answers
5k views

Which size spoke tool. Currently size 14

I have this spoke tool. The number I use on this tool is 14. I use it on a hybrid mountain bike. . I want to get one which is easier to use but I do not know which size. Here are the available ...
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5answers
637 views

Is a tire patch kit really necessary for urban commute?

I'm cycling for urban commute, on well-maintained roads and bike paths, Vittoria Randonneur "puncture resistant" tires, and at no point on my ride am I more than 1/2 mile (usually within 1/4, I bet) ...
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6answers
9k views

For a slightly warped wheel, is it worth getting it repaired?

My son has a relatively cheap kids mountain bike, no suspension or anything flash, and after a minor crash into a friend the back wheel is slightly out of true. It only causes issues under braking ...
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2answers
7k views

Slipping gears on new Electra Townie 8i

I just got an Electra Townie 8i bike and the gears are acting weird. I hear clicking noises when pedaling and sometimes it slips down to a lower gear. This is especially true for 4th gear. Is this ...