Rotor Warpage?

[Peter P.]

I have no experience with disc brakes, but reading THIS THREAD made me wonder:

Some discs have steel spiders attached to aluminum discs. Could this be done for heat absorption to mitigate any disc warpage from high heat braking?

Anyone experience disc warpage from high heat where the discs straighten out once they cool off?

[Mark McM]

I think you mean steel discs attached to aluminum spiders (aluminum is too soft and would get worn through quickly). Yes, many rotors have spiders and discs whose shapes and joinery (such as floating rivets) are intended to minimize warpage. And yes, I have many times experienced disc rub due warping after hard braking, with the rub disappearing after the discs have cooled.

[bigbill]

I experienced temporary warpage the worst with SRAM Red CLD discs. I replaced them with Shimano XT/Ultegra discs.

[JMT3]

I rode disc brakes when they just started on mtb’s. Road did not come until 2018 for me. Never had a warped disc and me being a weight weenie I always use the lightest. There are Ashima 140mm discs on my Litespeed T3 with almost 18,000 miles on them and the only time I get any noise from them is once in a while when something from the road gets on them and once in a while in the wet. If it’s road grim a quick wipe down with isopropyl alcohol on the rotor and pads and all is quiet again.