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.

24 questions with no upvoted or accepted answers
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0answers
137 views

Hole cover under bottom bracket: what is it and how do i screw it back in?

So I got curios what is behind this cover and had a look. Turned the bike upside-down, unscrewed it and took it off. When trying to screw it back in, I realized that there is nowhere for the screw to ...
4
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0answers
103 views

Carbon frame chipped by chain - how to repair?

I found out my chain is damaging my frame near the cassette. How can I repair this? It was damaged by my cassette in the indoor trainer which I am not using anymore. This is how it looks:
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0answers
6k views

Shimano STX rear shifter, broken spring

I have to repair a Shimano STX shifter 7 speed (from a Raleigh MT200 bike from 1995). It has a broken spring, and I am almost sure that is the only thing to be repaired. It is similar to that ...
2
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0answers
124 views

Bosch eBike wiring diagram, where to find?

My RieseMüllerPackster80 refused to start today. I guess there is a bad connection somewhere but as all I could do was plugging the battery and computer in and out, I am not wiser whether cabling has ...
2
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0answers
22 views

Hercules Mixte 5-speed hub repair spring

I pulled apart a 5-speed coaster hub on a Hercules bike. It has 2 cables, one on each side. After removing a few internal parts, I came to what appeared to be a spring that was just a mangle of wire ...
2
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0answers
156 views

Help identifying this $25 ebike

I picked up this folding bike for $25 thinking I would google it and have all the info I needed to get it functioning. Any help finding documentation would be great, what kind of battery can I plug ...
2
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1answer
3k views

Identifying Rear Axle Size

I've got a bent QR rear axle and am looking for a replacement. Seems that these come in 9.5 and 10 mm sizes with a couple of different threadings. When I measure the OD of the threads I get around 9.8 ...
1
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0answers
65 views

Rear wheel keeps ending up squint, axel on cassette side lateral movement?

I have an old(?) 2010 Carrera Vulcan MTB and the rear derailleur hanger broke a few months ago (my son accidentally bashed it with his bike). Even though the bike is old, it has not really seen much ...
1
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1answer
73 views

Bottom bracket compatibility

After two LBS's, a blowtorch and a tyre shops impact driver I finally have my bottom bracket out. It an aluminium frame if that makes a difference. On the drive side some of the thread is gone, ...
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0answers
171 views

Plastic Seat for Vintage Kids Tricycle

Anybody can tell me where to find this type of plastic seat? It sits directly on the tube, and holds on with a bolt on the middle. Thanks.
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0answers
1k 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 ...
1
vote
1answer
5k views

How to reduce pedaling resistance

I brought my hybrid bike to Evans Cycles recently to get the rear gear mech replaced after I broke it. When I got the bike back, it was significantly harder to pedal. I tried moving my gears lower ...
1
vote
1answer
150 views

Why are my quill pedal cages “wobbling”?

The plates and connectors on my old quill pedals "move around" in relation to the pedal axle itself: In the photo below, I'm pushing the pedals to opposite sides to show how the pedal cage "distorts". ...
0
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40 views

Fixing up a rusty old Rallye mountain bike

I bought a Rallye mountain bike from Facebook Marketplace last year and did most of the major overhauling then as well. It was covered in mud, gunk, rust, had broken pedals, etc. So I had replaced the ...
0
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0answers
53 views

Fluid trainer, repair leak?

I have a Travel Trac (Performance Bicycle) Century V fluid trainer, vintage c. 2005, that I've pressed into heavy-duty service during the pandemic. It's been working well these past months, but seems ...
0
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0answers
57 views

Rear derailleur adjustment

I have a 7 speed Shimano derailleur. It shifts really good from 1 to 6 but when I try to shift from 6 to 7 it just doesn't want to shift. Can someone help me?
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40 views

Ribble CGR Ti - Replacement Gear Hanger

The gear hanger on my bike broke about 3 weeks ago. This is a sacrificial part, but Ribble are out of stock and seem to have no idea when this critical part will be in stock again. I have looked on ...
0
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1answer
337 views

How to dismantle RST 381L forks

I have cannot remove the elastomer/spring adjuster assembly from the top of the forks. I can remove the bottom of the forks. You undo the assembly for adjusting the tension with a 10mm hex key. ...
0
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0answers
93 views

Bicycle pedaling resistance on single speed e-bike

Recently, I've bought an ebike that is about 2 months old now, I've maybe gotten 100-150 miles off of it as a daily commuter. When I pedal, it would have a lot of opposing force or friction, and ...
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84 views

Spin doctor Essentials II pump not working properly

I attach the pump head to the presta valve. It attaches properly and even a few PSI, like about 10 psi, go in and then the pump handle just wants to spring up and is very difficult to push down. I can ...
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120 views

Is the Trek Navigator 200 too hard to restore

I got a freecycled Trek Navigator 200 that based on my assessment seems to be from 2004. I have repaired one bike before and was thinking about taking the this one as a new challenge but it seems to ...
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0answers
706 views

Shimano SPD pedal - visible seal ring

I recently got a pair of XTR M9120 pedals. Today I noticed an elastic ring visible on the axel, and bits of grease on it too. The ring can be seen on the service manual This has happened on both ...
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1k views

Rear Hub Axle Appears Bent – Causes and Repair Strategy

I had my rear wheel off of the bike noticed that as I spin the axle it appears to be bent – the freewheel end of axle, for lack of a better way to describe it, orbits the centerline of the axle. ...
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0answers
84 views

My front wheel is slowing down too much

So i have a 26x3.5 bike it is a se fat ripper and meant for wheelies. What i notices is when i wheelie my front wheel stops way too fast where it is still able to ride but is harder to overall ride ...