On 16-11-17 14:43, AMuzi wrote:
On 11/16/2017 12:47 AM, Tosspot wrote:
Why do they have holes in them?

Car discs don't, motorbike discs don't, aircraft discs
don't.Â* Why do bicycle discs have them?

Many do have slots or holes. Typical low-end auto discs have a center
air channel. Our researcher discovered this by completely ignoring
normal maintenance:

http://www.yellowjersey.org/photosfr...t/NRCTDISC.JPG


As a maybe related question: Why do bike discs allow for so little wear?
The Shimano Ice-Tech discs are 1.8 mm thick, and need to replaced when
they wear to 1.5 mm. Would there be an issue with cooling if they were
thicker? Or, in the worst case, is this just a way for Shimano to sell
more replacements?

Ned