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Unanswered Questions

80 questions with no upvoted or accepted answers
9 votes
1 answer
949 views

Shimano Dura-Ace R9120 lever leaking

My bike's Dura-Ace R9120 rear-brake/front derailleur shifter (left shifter in UK) leaks brake fluid when I pull hard on the lever. It leaks from this specific place: I understand this lever is ...
6 votes
0 answers
109 views

What is forward drag on a coaster brake

I have a single-gear coaster brake bicycle that needed fixing. I would have to pedal real hard to get it to go and backpedal a block in advance for bike to stop. Very spongy brakes. Well I took brake ...
4 votes
1 answer
123 views

Samox crankset okay for touring bike?

I just bought a new Salsa Marrakesh. My main use is moderate distance touring (1000 km to 7000 km tours) although it might end up going further. The Salsa web-page says that the bike has an Alivio FC-...
2 votes
0 answers
46 views

Why have my rim brakes started making a scraping noise?

I bought a bike about 7 months ago, and I've noticed over the last few weeks that it's started making an unpleasant scraping noise when I brake. Does anyone know what might be causing this and how to ...
2 votes
0 answers
55 views

GRX disc brake caliper confusion

Trying to sort a rubbing issue and keep reading things like "push BOTH pistons back in, squeeze lever to center pistonS" but it looks to me like there is only one piston? When I squeeze the ...
2 votes
0 answers
34 views

Square taper with 15.5mm end?

I got a Star Trac NXT for £15 for some indoor fitness but it's missing its left crank arm. I thought to myself oh I'll just throw on a standard steel crank arm and I'll be good to go BUT it doesn't ...
2 votes
1 answer
74 views

Sram/Avid brake hose compatiblity

I have Sram Rival AXS which I want to transfer from one bike to another. Unfortunately the new bike is bigger (M -> XL) so new brake hose is required. SRAM recommends SRAM Brake Hose Kit - Double ...
2 votes
0 answers
50 views

Something like chainsuck on RD lower pulley after new crankset install?

I just switched out a Shimano M5100 crankset for a SRAM GX Eagle crankset. I am using a KMC X11-EL chain. I cleaned the chain before installing it with the new crankset. My RD is a Shimano SLX 11-...
2 votes
0 answers
95 views

Cable housing end cap for BR-M375

I replaced the no name brake calipers on an entry-level ebike for Shimano BR-M375. The cable housing for the rear caliper was a bit too long, so I cut off a few centimeters. Then, I put a new 5 mm end ...
2 votes
0 answers
362 views

SRAM Guide R bleed problem

I'm bleeding my SRAM Guide R brakes. When working on the rear brake I noticed that the fluid can go from the lever syringe into the caliper syringe, but not the other way around. I can't move the ...
2 votes
0 answers
101 views

Can't seem to quiet my disc brakes

I recently purchased a bike that clearly needed fixing, for a great price. I've given the bike a bit of a tune-up, but one thing that won't seem to go away is the squealing sound coming from the disc ...
2 votes
0 answers
367 views

Shimano BR M8000 callipers leaking after bleed

A couple weeks ago I noticed that the brakes (BR-M8000) on this bike were quite spongy and since I didn't know when there last bled was, I decided to service them. Everything worked fine for about a ...
2 votes
0 answers
284 views

after multiple brake bleed, lever's max stiffness is still close to bar

so after a few bleeds i've done on these Shimano saints, because of new levers replacement, i've found that the rear brake lever, although on max stiffness, goes way further to the bar then the other ...
2 votes
0 answers
177 views

SRAM Hydraulic brake stuck (with a changed bite point) after landing/impact

I experienced a weird problem on my SRAM level t 2 piston brakes. I like hopping my bike around, e.g. bunny hopping onto curbs. Sometimes, if the impact is hard, the brake lever would have reduced ...
2 votes
0 answers
5k views

Compatibility between Shimano 4-piston hydraulic calipers and levers (possible connection to German DIN cargo bike standard)

There are not too many 4-piston calipers by Shimano. M640 Zee and M820 Saint are identical (calipers), and upon release Shimano claimed to have a 'slight difference in leverage' (i.e. a different ...

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