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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138 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 ...
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2answers
85 views

Replace wheel with equal or better model

I got into an accident and my rear wheel is all bent up. I'd like to replace both with something better (lighter, if it'll make a worthwhile difference) or with an equivalent wheel model. My bike is a ...
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5answers
78 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 ...
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0answers
61 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 ...
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1answer
185 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 ...
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1answer
96 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 ...
7
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1answer
232 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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1answer
53 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 ...
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3answers
605 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 ...
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2answers
254 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 ...
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4answers
222 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 ...
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1answer
123 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 ...
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7answers
18k 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 ...
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0answers
69 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 ...
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2answers
141 views

Why has my ride changed?

The bike is a Specialized Camber 29, about five months old, from a shop about 220km away. Something feels different in my ride, and I'm wondering what it is. the rear goes sideways in sand much ...
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0answers
59 views

Serial numbers on bottom of a pedal crank housing from a 50s era Schwinn?

Can someone please explain what these three numbers mean on the pedal crank housing? I believe this to be the pedal crank housing from a 1956 Spitfire Ladies Bike. The Schwinn Serial reads M0D502 ...
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3answers
257 views

Replacing a chainring - what did I do wrong?

TL;DR I thought I could figure out repairs myself but clearly I'm a moron. I replaced the chain and chainring on my fixie last Saturday, and this morning it got scary loose on me. I started to feel ...
3
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2answers
2k views

Deformed/uneven/bumpy wheel/tire/tube, how to diagnose or repair?

My bike has a deformation in the rear wheel, almost surely not due to the rim. At some point the tire has a "valley", causing it to bump instead of rolling smoothly. I'd like to understand if I have ...
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2answers
298 views

What does a “dished” wheel mean? How to tighten spokes on such a wheel, without a spoke tension meter?

Should all the rear wheel spokes have equal tension? Or should the spokes from the side of the cassette be tighter, in order to skew to wheel in that direction, and the wheel to be centered in the ...
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5answers
212 views

Tools and spares needed to repair a chain on the road

I'm increasingly riding long-distance randonees/audaxes and I'm pretty confident I can fix most simple things which might go wrong with the bike. However, I've never done anything with a chain apart ...
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3answers
801 views

Is my derailleur hanger too bent?

I bent the derailleur hanger on my 9spd cassetted 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 a doozy with ...
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3answers
116 views

How do I stop my rear derailleur from rubbing against my chassis?

I have a fairly new Shimano rear derailleur on a cheap department store MTB a friend gave me. Recently the derailleur (particularly the jockey wheels) have started to rub against the chassis in high ...
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5answers
298 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 ...
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1answer
1k 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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0answers
39 views

Planet Bike speedometer won't reset

I have a planet bike speedometer and after the winter season it seems that it is no longer functioning. It will come on when the bike starts to move but I cannot reset it and it seems to be frozen on ...
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3answers
202 views

Rebuilding a rear wheel

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 ...
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1answer
129 views

I broke my rear axle, apparently it's an old style. Is it easily replaceable?

My rear axle broke so I took my bike into a shop to see what they suggested. I had read a few posts that had said it should be fairly easy to replace the axle. The guys in the shop said that because ...
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2answers
163 views

Do bikes require a specific brake type?

I have a old bike of mine that I want to fix up for my younger brother. I don't know the brand, it just says Shogun racing on it (I haven't used it in ages and it was a gift.) It had the factory ...
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3answers
267 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 ...
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2answers
525 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) ...
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0answers
77 views

Where can I find a Shimano cs50 stopper fixing bolt?

Somehow I lost a single 'stopper fixing bolt' on my down tube cable stop. I have a set of Shimano sm-cs50 outer down tube cable stops, and I don't want to buy new ones because I only need one bolt. ...
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2answers
125 views

Can a 120mm fork be mounted on Specialized Myka?

I have this fork available: RST Gila T8 (120mm travel option). The 80mm XCT fork on a 2-year old Specialized Myka is getting worn. I am considering installing the fork. Here it is explained that ...
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2answers
135 views

Can you rebuild a Sram gear hub?

I bought a used bike with Sram 7 gear hub and after a few weeks, the chain started falling of all the time. I took it to a bike shop and they told me that the problem is in the gear hub, that it's not ...
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2answers
395 views

Phil Wood Hubs: Anyone had a Pawl go?

I got front & rear Phil Wood hubs for a touring setup back in Oct of 2011. I'd been using them for commuting to work -- averaging 20 KM a day. Except I'd been off the bike for the month of ...
2
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1answer
188 views

What does vulcanizing solution in patch kits consist of? Can I buy it?

I have a pile of old patch kits for inner tubes that are complete except for the little tube of "vulcanizing solution" that comes in patch kits. With time, these tubes crack, or have a cap fail to ...
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3answers
161 views

Fork shakes on braking

I reanimated an old city bike. The front brakes work fine but the brakes squeaks. So I cleaned the rim and brakes, now the fork shakes on braking. What is wrong and how can I fix this? Change the ...
7
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4answers
1k 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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2answers
431 views

Disc brake producing noise after a crash

After little crash I'm hearing strange knife-like sounds from my disk brakes, but the wheel and brakes doesn't look damaged. What should I do?
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1answer
185 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
206 views

Maintenance of Fork springs on Marzocchi Bomber Dirt Jumper

I recently took my fork into my mechanic for service because it was making a rattling noise in one of the fork legs. Upon initial assessment he thought it was a broken return spring for the air ...
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2answers
301 views

Way to fix outward dent in rim?

On a ride today I ran over a water run off too fast and have caused an outward bulging dent in both sides of my rim. The bulge is hardly noticeable to see or touch but I "think" I can feel it when ...
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2answers
515 views

How to determine if my rear axle is bent?

When riding, the rear wheel feels as if there is a tiny pebble, stuck within the thread. The wheel is one week old, the hub is Shimano FH-M475. I have done only very tiny jumps - for example from ...
8
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1answer
296 views

Help please to identify my Tandem

I have just purchased an old tandem, but don't know the make or year. Can anyone help me to identify it. The frame is steel and it has a frame number of 452599. There are no decals fitted but I attach ...
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1answer
216 views

Bottom bracket mysteriously squeaking

Somewhere from the non-drive side of the drivetrain is coming loud squeak when I pedal hard. The story is long. First I threaded the BB-ES25 incorrectly, and had to spend half an hour with a file to ...
3
votes
3answers
1k 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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1answer
1k 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 ...
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1answer
97 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
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3answers
127 views

Why would each patch produce a new leak before resintalling tube?

I got a puncture in my tube (size 700c x 23c, Kendra, came with bike) and applied a vulcanizing glue and patch, then checked it. Before reinstalling the tube, there was now a new leak right next to ...
3
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2answers
2k 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 ...
4
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2answers
3k 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, ...