I don't use a 28mm disc, the calipers weigh enough without adding extra weight to the discs.
I wouldn't recommend a narrower disc to the majority, but for those savvy enough to monitor pad wear they are fine, anyone with a decent maintenance programme of a track or race car will be changing their pads way before they hear the grinding of metal!
The discs I use cost me about £110 a pair by the time they are machined up correctly. Bit of a faff but the finished product is good.
Its easy to get hung up over a lot of things, a big budget project would have a bespoke braking system, a budget project needs a functional and safe system and maintenance after every track.test/race is essential at any level.
Last edited by Mark S; 10-02-15 at 02:45 PM.
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