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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7answers
1k 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 ...
0
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0answers
267 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 ...
3
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2answers
142 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
votes
1answer
109 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
769 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
145 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 ...
1
vote
1answer
630 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'...
1
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1answer
87 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 ...
1
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1answer
206 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
997 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
87 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 ...
6
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2answers
443 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....
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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
230 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 ...
5
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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? ...
0
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2answers
117 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
261 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
65 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 ...
0
votes
1answer
76 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
681 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 ...
1
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2answers
420 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.
14
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8answers
1k 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
votes
5answers
1k 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
votes
1answer
900 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
votes
1answer
232 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
votes
1answer
596 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
votes
1answer
1k 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
votes
1answer
113 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
votes
1answer
341 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
votes
2answers
352 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
votes
5answers
5k 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 ...
3
votes
2answers
69 views

Can’t find name of a product used in carbon fiber repairs

Several years ago, I watched a youtube tutorial about repairing carbon fiber. I can’t find that video now, but one of the first steps, before applying sheets of cabon fiber, the guy used a compound ...
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1answer
64 views

I have polished aluminum that has become oxidized from water. How can I restore this to its normal state

Have polished aluminum that has become oxidized from water. How can I restore this to it’s normal state?
1
vote
4answers
186 views

Do hybrid bikes break/misalign easily?

Hi I recently bought a Brodie hybrid bike from a local bike store for ~$600 and as I know nothing about bikes I just trusted their recommendation to buy it. However on the way home today I made a ...
5
votes
2answers
152 views

What model/make are this Freewheel and Freehub?

I am in the process of overhauling my old Motobécane racing bike and I'd like to replace the freewheel, if reasonable. However, there is no indication of who made it (the bike shop couldn't help) and ...
5
votes
2answers
2k views

Mavic Road UST Repair

I have a small cut in the rear tire on a road Mavic tubeless tire. Is there a way to patch this, or do I basically just have to buy a new tire? update So I took the tire off the rim and saw that ...
2
votes
2answers
466 views

Can this damage to my brake mounts be repaired?

So, I tried to take some brakes off of a bicycle to change my old-style callipers with V-brakes; the results were not good. One of the "heads" or "lugs" was so caught in brake itself that I managed ...
4
votes
1answer
968 views

What to do about damaged bike frame

I recently bought a used bike from a police auction that had a nasty cut in the frame (presumably caused by a angle grinder or something similar). Should I be worried about the bike's structural ...
1
vote
2answers
86 views

Changing the middle chainring on a 3-chainring crank

I have a shimano acera crankset (3x) that is 28-38-48 with a 8 speed rear derail. Now I was going to convert this bike into a SS but decided not to mess with it. Can I take off the middle chainring (...
1
vote
1answer
488 views

Rear derailleur bouncing up and down in easiest gear

I crossing at a cross junction, so I literally only had a few seconds to cross because the cars beside me would turn right. As I pushed towards the curb I heard a loud bang. Anyway after that ...
4
votes
3answers
216 views

Old Shimano Altus Hub disassembly. Clockwise or counter clockwise?

I hope to squeeze a bit more life out of this old Shimano Altus hub and apart from having to build my own tool: Do I have to turn the inner part with the two notches clockwise or counter-clockwise? ...
2
votes
3answers
133 views

Can I use fiberglass cloth and resin to fix tiny holes in fenders?

I'm trying to restore an adult tricycle and the fenders have multiple very small rust holes in them. Can I cut fiberglass cloth and make a "sandwich" with them with the fender in the middle and then ...
2
votes
2answers
336 views

Is it OK if my brake pads are not “just” touching the rotor in my cable disc brake bike?

Mountain bike, cable disc brakes. My bike suddenly took a lot of effort to ride after maintenance. So I loosened the cable locking bolt and released more cable for my bike. It’s running much better ...
10
votes
1answer
571 views

What is this blue mesh tube thing in the Rema TT 06 patch kit used for?

I own an (old-ish) Rema TT 06 patch kit. The contents look like this: Notice the blue tube-like thing under the left box. In the part list on the manufacturer's site, I couldn't find any mention of ...
0
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1answer
352 views

Suntour Raidon 27.5+ 120mm air fork

i woke up this morning to my suspension feeling really odd. It is really hard to push down and stays down until I lift my wheel off the ground. What makes it even weirder is that it is making a noise ...
3
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1answer
101 views

Damaged rim, can it be fixed?

Cycled my friend’s bike and fell forward. Hoping this can be fixed.
1
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2answers
286 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... ...
0
votes
3answers
1k views

Hit by a car bent rim

I have a new 199.99 Schwinn I got from Wal-Mart a few months ago. Just the other day, a lady didn't stop for me and knocked me off my bike. The front wheel was stuck under her SUV, rest of the bike ...