Reply To: Gt250 comet front master cylinder compatability with twin-caliper setup
The GT250 Naked uses 1/2 or 3/4 piston due to it having a single disc.
The GT250R uses a 650R master cylinder that has a 5/8 piston to be able to brake 2 discs.
So if you want to use 2 discs , get the 250R cylinder (which borrows from the 650R anyways)