Discussion
With Shimano Ultegra on my Canyon winter road bike - yes, can't get rid of it whatever pad, brake cleaner etc i use, flippin' nightmare
With Shimano SLX on my Specialized Mountain bike - not a sound despite lashings of mud, slurry, half a lake etc.
With Campagnolo on my Summer road bike - no, stays pretty quiet even when wet
With Shimano SLX on my Specialized Mountain bike - not a sound despite lashings of mud, slurry, half a lake etc.
With Campagnolo on my Summer road bike - no, stays pretty quiet even when wet
Shimano discs do rub due to warping, rotors warp due to heat build up, they hopefully return to the correct size/shape when they cool down but this isn't always the case.
This is because of their design, in an attempt to save mass (and apparently move heat away from the braking surface, unconvinced as this drastically reduces convective heat transfer away as the linear velocity of the brake rotor is a function of position on the radius) they use a structural aluminium core with a steel lamina braking surface over the top, the aluminium isn't structurally as rigid as steel so does tend to warp, I've had a few go permanently out of true. I'm trying some swiss stop steel rotors currently, although only on the rear as the fronts haven't worn out yet. I've read that the tinging/rubbing occurs on road moreso than mtb as the mtb calipers have greater travel due to the lever ratios of the mtb compared to the road levers, I have no idea if this is true though...
In the wet the squeal is contaminants on the brake surface, you can reduce this by finding a combo of brake rotor and pad that is more forgiving, there will be a compromise in something though (durability, braking performance, cost, etc), I've got swiss stop rs on shimano ultegra rotors currently and its quiet.
Don't use brake cleaner unless its automotive style, the bike stuff (as with most cleaning things bike related) is garbage, or just use IPA on the rotor, also get some fine sand paper and take the surface off the brake pad.
This is because of their design, in an attempt to save mass (and apparently move heat away from the braking surface, unconvinced as this drastically reduces convective heat transfer away as the linear velocity of the brake rotor is a function of position on the radius) they use a structural aluminium core with a steel lamina braking surface over the top, the aluminium isn't structurally as rigid as steel so does tend to warp, I've had a few go permanently out of true. I'm trying some swiss stop steel rotors currently, although only on the rear as the fronts haven't worn out yet. I've read that the tinging/rubbing occurs on road moreso than mtb as the mtb calipers have greater travel due to the lever ratios of the mtb compared to the road levers, I have no idea if this is true though...
In the wet the squeal is contaminants on the brake surface, you can reduce this by finding a combo of brake rotor and pad that is more forgiving, there will be a compromise in something though (durability, braking performance, cost, etc), I've got swiss stop rs on shimano ultegra rotors currently and its quiet.
Don't use brake cleaner unless its automotive style, the bike stuff (as with most cleaning things bike related) is garbage, or just use IPA on the rotor, also get some fine sand paper and take the surface off the brake pad.
Juffled said:
Shimano discs do rub due to warping, rotors warp due to heat build up, they hopefully return to the correct size/shape when they cool down but this isn't always the case.
Are you doing alpine decents? they will only warp if seriously over heated, normal mortals on normal riding conditions will not warp a brake disc. Gassing Station | Pedal Powered | Top of Page | What's New | My Stuff