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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3answers
1k views

Broken rear axle. Why does it happen and is it worth trying to repair?

So I'm taking the time during the holidays to overhaul my commuter bike. The whole drivetrain was full of old oil, road salt and grime so I decided to take the whole thing apart starting with the back ...
2
votes
4answers
2k views

How can I remove a stuck rear cassette?

I've been trying in vain to remove a rear cassette that I myself installed about a year ago. I may have over-tightened the lock ring and now I can't remove it no matter what position I hold the ...
4
votes
2answers
7k views

How do I determine my wheel size

Would someone explain wheel sizes. If I am not mistaken, the wheels on my Trek 520 touring bike are 700C. There are no markings, and of course, no documentation of any kind. I assume 700 means 700mm, ...
0
votes
1answer
84 views

Possible Broken Shifter

My right Shimano shifter is now loose and clicking it doesn't do anything to the rear derailleur. I've checked the derailleur and it still works fine. How can I fix the shifter? Edit: It's a road ...
0
votes
4answers
174 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 ...
2
votes
2answers
199 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 ...
1
vote
1answer
136 views

Peculiar feel when pedaling

I ride an early 90s Scott Unitrack CST with the original Shimano Deore drivetrain it came with. Same as this one. When pedaling, the right pedal has a peculiar feel like a sudden inward jerk at a ...
5
votes
1answer
533 views

Pressure gauge on my pump stuck at one value, what is wrong?

I have a Specialized Switch Hitter I have used for several years on both Presta and Schrader valves. Recently, my wife tried to inflate her tubes (Schrader valve) and could not get the pump to ...
4
votes
4answers
569 views

Broken pedal on an old french bike

I broke the pedal of an old french bike (Peugeut Mixte 70's). The threading doesn't fit the one in modern pedals. Now I am wondering if I should insist in finding an old french pedal or if I should ...
1
vote
2answers
76 views

Wheel Wobbles and Rubs on Brand New Bike?

I just got a brand new bike and it came partially assembled in the box. I don't have a whole lot of experience when it comes to working on or building bikes but I managed to put it together. theres a ...
15
votes
10answers
10k 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 ...
19
votes
8answers
53k views

How to get a very tight tire back on the rim?

I needed to change the tube as a consequence of a flat tire and I am in the situation that it's just impossible to put the tire back on the rim. In almost ten years of experience with road bikes and ...
8
votes
3answers
986 views

Disk brake squealing after bike shop changed my pads. Is it enough reason to ask them to re-service (for free)?

I recently took my bike to the shop, since it started making a weird metal on metal (not squeal, just hard brushing sound). After checking it out the saw that the back brake pads where really (REALLY) ...
6
votes
4answers
1k views

How long should spokes last?

Trek Fx 7.3, 1 year old, 1900 miles 3 days short of my 1 year bike purchase anniversary I discovered some broken spokes on the rear wheel. The bike shop gave me a new wheel they had in the shop, an ...
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vote
2answers
159 views

Catastrophic failure

My rear wheel suddenly became loose in traffic today. It is completely off axis. The axle looks fine from the outside. I remember being told something about loose cones. Should I bother to repair ...
3
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5answers
402 views

How do I stop punctures for good?

Last night I came out of work to a flat tire. This is the second time I've got a puncture with less than 100km done on a brand new set of schwalbe smart sam tires. needless to say I was quite annoyed. ...
0
votes
1answer
58 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 ...
4
votes
4answers
8k views

Shimano Revo Shift Gives No Clicks

I have a problem with my shifter. My bike is using Shimano Revo Shift(gripshift) RS-35 (see my picture). The one shifting the front derailer (the left shifter) does not click when I turn it but it ...
6
votes
8answers
5k views

Why does the glue in a puncture repair kit dry up so quickly?

With puncture repair kits, generally you get like 6-8 patches and a tube of glue. The only problem is I can really only use the glue for the first patch because once it opens, it just ends up drying ...
2
votes
2answers
182 views

The best way to deal with/prevent punctures on tubular tyres

I recently picked up some rather expensive tubular wheels on the back of a lot of advice to do with rolling resistance, comfort etc. However I've recently found I'm quite afraid to use them on long ...
21
votes
10answers
6k views

Do glueless tube patches work as well as glue ones?

Quite a few years ago I tried some glueless patches for repairing my punctured tubes while out on the road, and found that they rarely stayed on for very long. I know that technology has advanced a ...
4
votes
5answers
349 views

If a derailleur cable snaps on a long ride, how can I keep going?

A couple weeks ago I rode around Crater Lake, a 35 mile ride with over 4500 feet of cumulative elevation gain – the sort of ride you really want functional gears for. The night before my rear ...
4
votes
1answer
210 views

Reoccurring Bent Axles, any reasons or upgrades?

Earlier this month I had a issue with a broken axle. It was the original that was sold with the bike and lasted around 5,000 miles. I went to my LBS and bought a new axle (unbranded, labeled, etc, ...
0
votes
1answer
204 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 ...
8
votes
1answer
7k 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 ...
2
votes
4answers
143 views

Are there any permanent solutions for holes smaller than 1cm on outer tyre?

My road bike tire is damaged because of some biketrap I fell into. After a month I got a flat while riding. I found this hole at the damaged area while repairing the puncture on inner tube. After ...
0
votes
2answers
206 views

Fixing broken STI shifters - plastic gear cable surround

As pictured, after knocking over the bike I've broken one of the plastic surrounds where the gear cable enters the front derailleur shifter. Shifting between the lower two chainrings still works, but ...
1
vote
1answer
831 views

Shimano dual lever Ultegra ST-6600

The shifter cable broke on the way home from work. The break was inside of the dual lever assembly. I was able to fish out the cable end. But, with a new cable, I am not able to get the shifter to ...
8
votes
7answers
13k 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 ...
8
votes
3answers
332 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 ...
4
votes
2answers
5k views

How do I stop my brake from sticking?

The rear brake (calliper) on my road bike sticks. When I pull the brake it pulls down but only half springs back and there's then slack in the leavers. This is causing rubbing on the rim. It's a ...
3
votes
3answers
284 views

Rear index shifting not staying in middle gears

I have replaced a chain (SRAM PC 830) and 7 speed freewheel (Shimano MF-HG37) on the back of my daily commuter bike about 300 miles/ 3 weeks ago with the same models. The old parts lasted me 4000 ...
7
votes
3answers
1k views

Is my derailleur hanger too bent?

I bent the (steel) derailleur hanger on my 9spd cassetted (steel) Bianchi Volpe about 1.5 yrs ago, and I just did it again, but worse. This time the derailleur got sucked into the wheel and really did ...
2
votes
2answers
785 views

How do I know the model of my Shimano Torney SIS Index Rear Derailleur, I have a Vertical Henox T3 bike?

I had a vertical henox t3 bike which I hadn't ridden in a long time I changed gear and the derailleur bent into the wheel spokes and the derailleur is now bent and doesn't work properly. The ...
2
votes
1answer
211 views

Selecting a compatible BB: spindle offset

Replaced Shimano Bottom Bracket, now front derailleur won't shift to largest gear How do I measure a bottom bracket? I thought the only thing that mattered when replacing a bottom bracket ...
0
votes
0answers
41 views

Shimano Inter7 axle unit disassebly

I am trying to disassemble Shimano Inter7 SG-7C26 unit to clean and repair after a bearing retainer that is situated between parts 1 and 2 broke. I am having problems removing part 2. Does anyone know ...
1
vote
0answers
96 views

Lowrider style bent forks techniques

Would a 24 inch bent fork fit on a 20 inch frame? Is there even a 24 inch fork? Would a 26 inch fit? Also if it doesn't fit in could I just add to the 20 inch - would you be able to extend it making ...
0
votes
1answer
224 views

Changing one of the chainrings on SR Suntour NEX crank?

I have a SR Suntour NEX (42x34x24) crankset and got my system really bad recently. But as I've used the second (34) chainring most of all I would like to replace only this one. Is it okay? Does my ...
11
votes
5answers
2k views

What are the downsides of a twisted wheel?

After a collision where somebody fell on me, my front wheel is twisted to the point that it slightly touches the brake once per revolution causing a soft screech. Logistically, I can't get to the shop ...
1
vote
4answers
357 views

Damaged (scraped) tire - what to do?

First of all, I am either inexperienced or very lucky because I have never had a flat bike tire in my life. Now comes the question. I have a basic "Specialized Sirrus 2013" hybrid bike which has run ...
1
vote
3answers
199 views

How to fix V-brakes

Somehow the little black rubber thing that goes with the brake got folded over the silver round clip... I tried various tools (After my fingers etc hadn't proved useful) in trying to drag it back but ...
2
votes
5answers
104 views

How can I tell if I have properly patched a tube? (specifically a 2" mt. bike tube)

I normally swap out a the tube on the trail if I get a flat and then patch at home. So that leaves me with a patched tube ready to put in a tire and I'd like to test it without having to swap out a ...
1
vote
0answers
114 views

Mystery item broken on old Dawes. Help!

I was adjusting rear brakes last night and this little thing snapped in half (see image [right]). The linear indent holds my brake cable in place and a 5mm bolt holds this in place. I guess I need to ...
7
votes
1answer
246 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 ...
0
votes
1answer
214 views

Slow lever return after shortening brake line and bleeding

I've just recently replaced the brakes on my MTB with a pair of Shimano XT hydraulics. The rear brake line was extremely long for my frame's routing, so I had to cut it and subsequently bleed the ...
2
votes
3answers
1k views

Best way to patch road bike tubes

I've scoured the internet for this answer, as I recently just tried to repair a tube on my Purefix fixed-gear bike which I assume uses tires and tubes similar to road bikes, as the tire size is ...
7
votes
2answers
2k views

How many years an aluminium frame lasts in a touring bike?

How long does an aluminium frame lasts in a touring bike? [Removed extra questions to be clear.] Background So far I preferred aluminium vs. steel for many reasons, but if steel lasts ...
3
votes
4answers
1k views

“Quick Fix” Tyre Repair Spray Cans

I saw this in my local supermarket, as they are having a cycling event on at the moment. I was thinking this would be quite useful if I had a puncture away from home, the car or bike repair shop, or ...
2
votes
1answer
222 views

What parameters are important when replacing a rear hub?

My rear hub is damaged. I have not yet inspected the source of the damage, but the wheel is moving sideways when rotating (a LOT), plus I rode it like this for about 35km. Therefore, I find it ...
39
votes
7answers
25k views

Can I ride home with a broken spoke?

I noticed a wobble in my back wheel while commuting in this morning. Broken spoke. Is this a problem that I should take care of before my 7 mile commute home, or can I pick up a spoke and repair it at ...