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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1answer
236 views

Pedal sometimes getting stuck

Back story During this weekend we went on a trip with rented bikes, and observed the following problem on one of them: the left pedal would sometimes not spin on the shaft (i.e. it remained in the ...
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2answers
1k views

What replaces Shimano Deore LX rear derailleur RD-M570?

They stopped making my current derailleur in 2003. I need to replace it. How do I choose a replacement part? A good answer will tell me a specific part (with part number) that will replace the RD-...
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1answer
242 views

Clicking noise when cranks rotate

I've got an old `86 Raleigh fixed gear bicycle that is making a loud clicking noise when the cranks rotates. It seems to have just started doing this today. I'm looking for someone who, maybe has ...
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2answers
139 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 ...
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2answers
78 views

Cause of dent on derailleur hanger?

I was cleaning my bike and when I take my rear wheel off I notice the quick release skewer is bent. I bent it back and when I lock my rear wheel back I notice the spin part of the skewer's plastic ...
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3answers
622 views

Is it ok to trim down a tube patch?

I got a 700x18-23 inner tube that just got punctured. The small round patch on my patch kit is a bit wider than the inner tube itself. Is it ok to cut around the patch so it fits? An added question: ...
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1answer
129 views

I need some help identifying a bike I just acquired

I need help identifying this bike.
4
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1answer
151 views

What is this part of a bicycle trailer called, and where can I find a replacement?

I have a Schwinn double bicycle trailer for my kids, but it is broken. The black plastic part pictured fits at the base of the right wall and connects it to the trailer frame. A bolt goes through the ...
4
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1answer
767 views

How to repair pedal snapped off crank arm? [closed]

The pedal axle snapped just where it enters the crank arm. This left the threaded portion of the pedal axle in the crank arm hole. How do I remove this to replace the pedal?
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2answers
187 views

Tubeless Tyre Repair

Last year I got a puncture in my tubeless tyre from a chunk of glass during a multi-day 500 mile ride (see photo below). The sealant did its job quickly and efficiently, and the seal has held without ...
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1answer
199 views

Disc brake keeps making ping-like shudder

I have a commuter bike with Tektro MD-285 hydraulic disc brakes. I commute about 14 miles every day (7 in, 7 out) in most types of weather, but I am not a performance cyclist by any means. It's just a ...
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2answers
102 views

Need anti-rotational washer for Pedalease ebike

My Pedalease e-bike is missing one of the rotational washer and I have attached a photo of the the original ones it came with and I hope you could help me.
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5answers
3k views

Technique for self-adhesive puncture repair patches

Is there any special technique for using self-adhesive puncture repair patches? Today, I've had two different tubes fail within a minute of being inflated because the air pressure had split through ...
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1answer
52 views

Back wheel lock up, when got off wheel would move side to side [closed]

I have a 29 inch Iron-Horse/Sunday 24 speed. My back wheel locked up, when I got off the wheel would move side to side. I thought I lost bearings, took my freewheel apart and clean. Doesn't look like ...
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1answer
347 views

Which grease to use when servicing RST suspension fork

I would really need an answer because my forks got really stiff and I want to service them.
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2answers
325 views

Will any Shimano mountain bike shift cable set work with any Shimano mountain bike derailleurs and shifters?

(Forgive me if this question has been asked before - but I don't know if I'm searching with the correct keywords to find the answer...) My rear derailleur cable is stuck hard into the side of its ...
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2answers
181 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 ...
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7answers
2k views

Bicycle Repair Stand Solutions for bikes with a Dropper style seatpost

Problem: I have at least one MTB with a dropper seatpost that does not allow for clamping on the seatpost itself and there is not enough room between the rear tire and seat tube to get the jaws in ...
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0answers
391 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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2answers
149 views

Old Sears Simpson bike bottom bracket replacement

Got the pedals out, but I'm struggling with both cups. I don't know which way the threading goes either. The bike was made in Poland, pretty old. Anyone know what I could do? I have a flat-shaped ...
3
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1answer
123 views

Can't fit damper back into suspension forks

I'm driving myself mad here trying to fix this. I work in a local bike rental / repair store, and took apart a bike's Suntour NEX 4610 V4 (2012?) forks from one of the rental bikes - now I can't fit ...
4
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3answers
773 views

Restoration project, help needed

I've been gifted this frame by a family member and would love to restore it to its former glory. I literally don't know where to start. The brake levers are frozen solid and don't move at all. The ...
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3answers
189 views

Bottom bracket replacement

I have an old '89 Trek Singletrack 950 with the original Shimano Mountain LX group bottom bracket. I'd like to replace the bottom bracket with something new. Can anyone help me determine what will fit ...
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1answer
852 views

My rear wheel axle has broken this is second time [duplicate]

Hi! my bike is Trek Marlin 4. I don't know why my axle broke so easy and this happened second time. its almost winter in my nation we don't have good bicycle shops. They will be close so soon. I can'...
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1answer
104 views

How to fix a crack in a silicone grip

I have a brand new pair of silicone grips. Somehow, one of the grips got a crack. Its mostly an aesthetic issue, as no fragments of the grip where lost. Is there any glue appropriate for silicone to ...
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1answer
248 views

What is causing my disc brakes to loosen when it rains?

I have Tektro Aquila disc brakes, and I have recently noticed that the brakes need tightening every time it rains. I don't see mention of this model in Are there any major outstanding recalls of ...
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6answers
2k views

Clicking sound on each rotation of the pedals only when riding

Let me prefix this by saying that I don't know much about bikes. Especially from the terminology perspective. When riding, I can hear a relatively quiet click when I push down on the pedals. It ...
2
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1answer
92 views

Fixing hub gasket squeal

I have a relatively new Salsa Journeyman, which has now, after about 200km, developed a squeal in the front hub. The squeal is relatively quiet on low speeds, but gets noticeably loud when riding ...
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2answers
567 views

Toothed plastic cup on bottom bracket got sheared off - still removable?

I messed up. I wanted to switch out the bottom bracket on my bike. When I tried to do that the toothed cup on the left side (non-chain side) sheared off. The entire thing is now plain with its housing....
5
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2answers
2k views

Derailleur hanger built-in/cast with frame — options if misaligned?

As per the photos below showing visible misalignment of the rear derailleur hanger: and secondly its construction (where it is built-in with the dropout and frame): Please could you help me and ...
3
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2answers
302 views

Is it possible to service rear derailleur pulleys?

The outer pulley of my RD-M735, when spun, sounds scratchy and feels slightly grindy as if there is a tiny piece of dirt/grit that has fallen inside. I have literally soaked it in WD-40 and then 3-in-...
7
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4answers
3k 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 ...
4
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3answers
1k views

Rear wheel not straight because of worn out dropout?

I noticed that my rear wheel wasn't straight and even after realignment it wouldn't stay straight. After some investigation I noticed that my rear dropout appears to be worn out: Is this the problem? ...
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2answers
134 views

Wobbly stem: serious issue or not?

I went test riding a second hand bike. During the test I have found that the stem was wobbly around the axis defined by the red star in the picture. I have tried changing the tilt of the stem to ...
2
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2answers
269 views

Are these spokes too damaged to use?

So, I've had the chain slip under the biggest sprocket a couple of times, and the spokes got chewed up by it to the point that two of them have broken recently. So, I decided to replace all the ...
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2answers
69 views

Help to Diagnose a Problem with Northrock XC6 Mountain Bike

I have been fixing up a Northrock XC6 bicycle. Symptoms: Chain clunk when trying to start moving. It feels like the chain is slipping. It only happens under load, I cannot get the same symptom by ...
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3answers
3k views

OK to ride with a slightly bent mech hanger?

My rear derailleur took a knock from a fall, and the entire shifting range moved inwards by about one sprocket width. I suspect, but am not sure, that the mech hanger got slightly bent (could be ...
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1answer
79 views

Clicking noise while pedaling [duplicate]

I have a Trek Domane S4 (carbon) that makes a random "clicking" noise while pedaling. I can feel it thru my feet, so I'm thinking its coming from the crank area, but can't seem to figure it out. I use ...
8
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2answers
820 views

Tube patches: dedicated ones or recycling old tubes?

Before I discovered puncture less tires, I had often to patch my inner tubes. I initially bought dedicated patches (which invariantly were too big or too stiff), then decided to try cutting old tubes ...
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2answers
494 views

Specialized Rockhopper derailleur hanger needed…which one?

I need to know which drop out hanger I need for this Specialized Rockhopper. Part of the frame is chipped at the dropout but it will still bolt on. I just don't know which hanger I need.
15
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8answers
2k views

Why using a puncture repair kit instead of a new inner tube?

I am a casual rider (~30 km commute as often as possible) in an urban setting. Reading this SE site to learn about biking (the resource is extraordinary, even though I don't understand every ...
4
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5answers
2k views

Can't remove 6mm hex pedal

I've ruined two hex wrenches trying to remove my pedal. I actually got one off after blasting it with a hot-air heat gun for a while. The other one remains stuck and Yes, I'm turning it the right ...
8
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1answer
907 views

Can’t seem to put the wheels back on the frame

I’ve removed both wheels to do some deep cleaning. And even though, I’ve removed the wheels before I would immediately pop them back on without a problem. This time I left them out for a few weeks, ...
2
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1answer
275 views

Parking a 3-speed internal hub in 2nd gear permanently

I recently bought a gently used, not super well maintained Columbia 3-speed bike from some time in the 80s. It has an internal hub - the dreaded Shimano 333. My eventual plan is probably to convert ...
7
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1answer
663 views

What did I just do? Fluid shot out of my handlebar when pushing my caliper in

I just bought a new road bike with hydraulic disc brakes, using a Shimano Ultegra R8020 Groupset. The pad was rubbing on the rear rotor and it wouldn't recenter when pumping the brake. The brake lever ...
3
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1answer
2k views

How to change the seat clamp on a dropper post?

While trying to tighten the screws on the seat clamp on my wife's bike, I overtightened one of the screws, damaging both the screw and the seat clamp. (I had used a torque wrench and had set it to the ...
3
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1answer
115 views

Straigtening a rim with 7mm deviation in a single section

In a recent crash my front rim experienced significant sideways force. There was no burring on the lip of the rim, but the section was (eye-measured but perfectly drawn) (y is left-right deviation): ...
3
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1answer
396 views

Unusual bottom bracket shell

I broke my bottom bracket axle a few days ago, and when I removed the crankarms I discovered my old bike is using a cup and cone bottom bracket but more importantly the bracket shell is a bit odd. It ...
4
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2answers
372 views

Mystery little bolt fell off near rear axle

Hi All! Please help with advice. I was doing some regular brush cleaning on my new Diamond Mission Pro bike that I purchased off the diamondback website (less then month old). A little bolt near rear ...
9
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5answers
6k views

Fix up old road bike or buy new one?

Coming back to riding after a long layoff, my Cannondale R500, purchased around 2000, according to the local bike shop, needs a lot of work - new wheels, cassette, chain, cables. Also replaced stem ...

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