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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5
votes
1answer
11k views

Upgrade/Replacement options for Cannondale Headshok DD50?

I have an older Cannondale that I love. It's an F600 comp (the special edition one in pumpkin orange), with a DD50 front shock. The problem is that the DD50 is WORN as all heck. Even when locked ...
4
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3answers
3k views

Electra Shifter (Revoshift) is hard to turn

My wife has a hard time turning the Revoshift grip on her Electra Townie 7D due to arthritis issues in her hands. Is there a way to help with this issue?
4
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3answers
7k 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 ...
4
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2answers
196 views

How do I determine what types of maintainence I need to perform?

I just got a new bike and I want to make sure I’m able to keep it up properly. I am entirely new to this. Edit: thank you all for your responses, I’ll keep these all in mind and I’m adding them to my ...
4
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4answers
29k views

Crank threads stripped - both pedals fell off

Something really strange happened to me - 2 years ago I bought a bike (Carrera Gryphon Hybrid from Halfords). I had just about 100 miles on that bike the month I bought it and than I locked it to a ...
3
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1answer
2k views

Replaced left crank arm but still comes loose?

A few weeks ago I bought a new (albeit cheap) self assembly bike from a local store, this bike to be exact http://tinyurl.com/gw77p9t . After about two weeks use (one and a half hours of cycling on ...
21
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4answers
11k views

Sequence for a complete road bike overhaul

I have a road bike that I plan to completely overhaul soon. Over the years, and with several bikes, I have overhauled most every component, but have never managed to do this for an entire bike, start ...
16
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3answers
2k views

What is the maximum number of pucture repairs an inner tube can take?

Any thoughts - my spare tube that I carry in my bag currently has a dozen or so patches on it, but still works fine. I'm tempted to keep going to see how many I can get on there until it get ...
14
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2answers
2k views

How do I remove the wheels from my bike (not a typical nut)?

I just bought a used Kona Roundabout bike and I can't figure out how to remove the wheels. I've never seen this connection before. The same connection is on both the front and rear wheels and ...
11
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4answers
2k 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?
10
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3answers
1k 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, ...
9
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5answers
1k 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) ...
9
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4answers
71k 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?
8
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4answers
15k views

Bicycle's inner-tube got puncture right next to the valve, How to patch it there?

There is a very small cut 1-2 millimeter or less long in the inner-tube, right next to where it's the bottom of the Schrader valve. The cut is only 1-2 millimeters far away from the valve's bottom. ...
8
votes
1answer
1k views

Dent in bearing cone, try to get a new one, or can I keep riding like this?

So I opened my rearhub, because there was a lot of dirt in there after 4000 kilometers usage and I found that there is a little dent in the bearing cone. When I slide a bearing ball over that "dent" I ...
8
votes
3answers
23k views

How do I get rid of this clicking sound in the back wheel?

Difficult to diagnose, I know. Basically, I bought a single speed Schwinn a few months ago, and after riding it for a couple of weeks it started clicking in the back wheel somewhere. I've taken it ...
8
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2answers
1k 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 ...
8
votes
1answer
21k views

If the chain/cog no longer drives the wheel, can this be fixed?

Suddenly (without anything sounding like it was broken) the chain no longer turns the back wheel. The cogged part of the wheel is turned by the chain but this doesn't turn the wheel. Is this ...
7
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2answers
4k views

How many times to patch a tube before dumping? [duplicate]

Related: Patch or replace tube? This video asserts that: A properly patched area of a tube is stronger than intact tube area Never patch a tube more than 3 times Those are seemingly contradictory....
7
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2answers
29k views

How to Patch a Bike Tube?

Related (but more general): What steps should I follow to patch a tube? I have done this more than a hundred times, but am still not sure what are the correct steps. Here they show to put glue on ...
7
votes
4answers
4k views

Bending back a bent head tube - is it worth trying?

I have a bike that was in a major front end collision (I T-boned a car). The frame is steel and the bike bent at the head tube, the welds seem to be fine. Pictures below. I am fully aware the ...
7
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5answers
2k views

Patching waterproof panniers

I've managed to tear a couple holes in my panniers. Nothing enormous; they can still hold their contents, but they definitely need patching. What would be a good way to patch them, keeping them ...
6
votes
1answer
3k views

Shimano Nexus 3 (SG-3C41) 2 and 3 gear problem - Ring Gear Unit Repair

I have this internal gear hub and i try to fix it. 1st gear is ok. On 2nd and 3rd gear, especially when I run faster, the hub is not engaging properly, missing engagement sometimes. It is not problem ...
6
votes
1answer
2k 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 ...
6
votes
2answers
1k views

Lost left crank arm crank end cap

What parts do I need to put this back together? I've lost some pieces going for a ride but I'm not sure what exactly. I think I'm missing the end cap to the crank and maybe a spacer. I was heading ...
4
votes
1answer
1k views

What caused this seat clamp / frame failure?

Here's my "long distance" ride, which is an old steel MTB without suspension. I picked it up by the saddle to move it and felt some play, I thought the saddle rails might have been loose, but as per ...
4
votes
2answers
8k 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 ...
4
votes
2answers
167 views

Possible to identify sprocket without taking the bike apart?

I would like to change the chain and sprocket on my Centurion Basic 7 speed, as I have read that it is good practice to change the sprocket when changing the chain. It will be the first time I try ...
4
votes
2answers
10k 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 ...
4
votes
5answers
10k 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 ...
3
votes
3answers
7k 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 ...
2
votes
2answers
1k views

How can I fix panniers that have got holes in

I've got some Crosso panniers that have got quite a few holes in. I once fixed a drybag backpack with patches of leather and industrial strength glue which worked like a treat, but I've forgotten what ...
2
votes
1answer
7k 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, ...
2
votes
8answers
56k views

Crank pedal spindle hole thread stripped

I'm attempting to reassemble my bicycle after it was shipped across the US. All is well; except one pedal cannot be screwed back in because the thread in the crank is stripped. The pedal itself seems ...
2
votes
2answers
17k views

Shimano Revoshift repair

My bike has a grip shift (Shimano revoshift) which isn't shifting through all 8 gears. Even with the gear cable removed (it recently broke) it will only shift through half of the gear numbers and ...
2
votes
1answer
4k 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
2answers
2k views

Should I change the tire and tube or can it be patched?

Someone deliberately pierced the rear tire of my fixed gear bike. It's a 700cX25 tire with 700cX18-23 tube inside. As you can see from the image the threads have come out. I am not sure about the ...
1
vote
1answer
580 views

Rear derailleur breakages [duplicate]

This is hypothetical in the spirit of a recent question about derailleur cables, but I've seen two bikes being pushed with broken rear derailleurs in the last few days. What are likely causes of ...
1
vote
1answer
110 views

What non-metric fastener heads are left on a standard bicycle?

I believe that we've for the most part made the transition to metric on contemporary bicycles -- at least for the tools we use to repair them, am I right? For example, while many screw threads are ...
1
vote
3answers
7k views

Cycle tyre and tube burst

I pumped my cycle front tyre to 105 psi (700*23c) 5 days back and cycled some 60 km on the same day without any punctures. Afterwards I parked the cycle in my bedroom for the last 5 days (due to ...
1
vote
3answers
4k views

How long does it take to replace bottom bracket bearings?

How long does it take to replace bottom bracket bearings? Is there anything that can make the procedure take more or less time? How does the type of mechanism affect repair time?
1
vote
2answers
103 views

Diagnosing faulty circuit in vintage incandescent headlamp

I've got a steel-framed bike with incandescent lights, probably from the '70s. Unfortunately, despite all my efforts to get it working, the headlamp refuses to work. History About six months ago, ...
1
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2answers
449 views

When is it worth rebuilding a frame?

I found a discarded 'mongoose alta' frame and an 'araya - japan' front wheel. It's missing the rear wheel and the seat (no seat post either) Looks like the gear change is still in very good shape... ...
1
vote
2answers
430 views

Where to get replacement bolt for rod brakes

Well, I did it again: While working on a bike with rod brakes I lost the bolt which connects the two "actuating" rods to each other (I have no idea what these parts are even called; The measuring tape ...
0
votes
2answers
308 views

Axle flex under load normal for freewheel hub?

When using a freewheel'd hub is it normal for the drive side of the axle to flex a little bit? I replaced the kickstand on my bike and the new one sits closer to the rear tire with about 2 mm ...
0
votes
1answer
803 views

What exactly happened to my rear derailleur?

I had installed my front derailleur and was adjusting the high/low when I noticed my rear derailleur was hitting the spokes of my wheel. Suddenly, I saw a screw pop out and then my derailleur popped ...
0
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1answer
2k views

Campagnolo Ergopower inaccurate shifting on high and low cogs

I replaced the G-Spring and G-Spring carrier on my 9 speed Chorus Ergopower. Now it is shifting better and the clicks are sharper, but I can't adjust the derailleur to shift good on all gears good. ...
-1
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2answers
210 views

Help identify this derailleur hanger

I need to buy a new derailleur but I can't find the same derailleur hanger, I checked all of the websites but I still can't find it. I don't want to buy it from a bike shop yet because it's more ...
-5
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2answers
2k views

How bad is it **really** to bend aluminium rims? Requesting evidence based answers [closed]

Context: Bicycle wheels can become untrue if the rim is bent, e.g. from hitting a curb. The usual question: Can a bent aluminium rim be bent back straight? The two camps (figuratively): 1. Sure, go ...

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