The Great Braking Debate Thread (Disc/Rim/Cantilever/Fixie/InsertNewTechHere)
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For the disc brake users out there: What is the best combo in rainy/dirty road conditions? I have Dura Ace 9170 calipers with stock discs/pads. They make an AWFUL sound and always seem to rub with the slightest amount of dirt. Sunny, dry conditions work perfect.
Road // 2023 S-Works Tarmac SL8 | Shimano Dura-Ace Di2 | Roval Rapide CLX
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Gravel // 2023 Specialized Crux Pro | SRAM Force AXS | Roval Terra CL
Retired // 2022 S-Works Shiv TT // 2021 S-Works Tarmac SL7 // 2019 Specialized Allez Sprint Red Hook
Use your rim brake bike in the rain!
Oh wait a minute...
Oh wait a minute...
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Ritsuke wrote: ↑Mon Dec 06, 2021 8:16 pmFor the disc brake users out there: What is the best combo in rainy/dirty road conditions? I have Dura Ace 9170 calipers with stock discs/pads. They make an AWFUL sound and always seem to rub with the slightest amount of dirt. Sunny, dry conditions work perfect.
SwissStop RS. If you are suffering rub, advance/reset your pistons several times, floss them and make sure the caliper is aligned looking at the pad edges from ends of the caliper. Also the best position for avoiding rub when you’re really sawing your bike back and forth might not be perfectly symmetrical, especially for the fork. Forks tend to flex laterally in one direction more than the other, so you might want to shift the caliper a hair’s width toward the outside or something like that.
What is "flossing" a brake?TobinHatesYou wrote: ↑Mon Dec 06, 2021 8:34 pmRitsuke wrote: ↑Mon Dec 06, 2021 8:16 pmFor the disc brake users out there: What is the best combo in rainy/dirty road conditions? I have Dura Ace 9170 calipers with stock discs/pads. They make an AWFUL sound and always seem to rub with the slightest amount of dirt. Sunny, dry conditions work perfect.
SwissStop RS. If you are suffering rub, advance/reset your pistons several times, floss them and make sure the caliper is aligned looking at the pad edges from ends of the caliper. Also the best position for avoiding rub when you’re really sawing your bike back and forth might not be perfectly symmetrical, especially for the fork. Forks tend to flex laterally in one direction more than the other, so you might want to shift the caliper a hair’s width toward the outside or something like that.
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Have you noticed a difference between front and rear?Ritsuke wrote: ↑Mon Dec 06, 2021 8:16 pmFor the disc brake users out there: What is the best combo in rainy/dirty road conditions? I have Dura Ace 9170 calipers with stock discs/pads. They make an AWFUL sound and always seem to rub with the slightest amount of dirt. Sunny, dry conditions work perfect.
I find SwissStop RS pretty good as an all-round pad, but they'll still howl if it's really wet. Unfortunately, I don't think there's an easy way round the noise that comes from dirt landing on the rotors; the clearance needed (small) dictates that. This is with GRX Di2 levers, Catalyst rotors and 9170 calipers.
The downside to the RS pad is when you need to dissipate a lot of heat - braking force begins to reduce. I wish they made a version with the aluminum back plate that the Exotherm has.
If the roads are really bad (I'm thinking grit/dirt) then sintered pads work well, and are not really much noisier than the various organic pads I've used. [Edit: in fact quieter in many circumstances, possibly because they heat up more easily]
As was quoted somewhere on the forum by Graeme FK, quiet disc brakes in the wet are the Holy Grail ie it doesn't exist. The clearance is so close on wet/gritty roads (I'm talking British lanes here so unless you ride those you won't know) that you'll still get a scraping noise between the caliper and the pad even when you're not braking. Nothing will prevent this noise unless you just gently brake for a second or two to clear it. Within a few seconds it's back again as the spray sends gritty muck back up there in between pad and caliper.Ritsuke wrote: ↑Mon Dec 06, 2021 8:16 pmFor the disc brake users out there: What is the best combo in rainy/dirty road conditions? I have Dura Ace 9170 calipers with stock discs/pads. They make an AWFUL sound and always seem to rub with the slightest amount of dirt. Sunny, dry conditions work perfect.
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Rim brakes aren't too quiet in the wet either.
That grinding sound is your rim being worn away.
That grinding sound is your rim being worn away.