Hi there, quick question as im building up a cotic bfe, i just want to know what caliper sizes i need for my hope m4`s, im after 2 caliper mounts (hope ones) the rear looks like its a side on fitting and the front is attached to a 2013 fox fork ctd 32 150, now im going to be running the hope floating rotors, front size will be 203mm and the rear will be 183mm, if anyone can tell me which caliper mounts i need with site links or which letter mount etc that would be great cheers !

Front C mount, rear B mount.
This is assuming calipers are post mount and rear mount on frame IS
See http://www.hopetech.com/page.aspx?itemid=SPG315&tab=specification

ok cheers, not sure i just know there m4`s 🙂

The two sets of M4’s I have worked on for a mate were post mount but earlier versions were IS. Do the holes for mounting bolts run horizontally e.g.parallel to pistons, or vertically at 90 degrees to pistons? Former is IS, latter post mount
If IS, then rear adaptor is this:
http://www.chainreactioncycles.com/Models.aspx?ModelID=13736
Front adaptor would be tricky, they do do a +20 e.g. For 183 disc

erm ill just go and look where the holes point

both are looking down towards the mount on the caliper?

sorry yeh the rear are along side with the pistons ill try find a pic

http://www.freeflowbikes.com/Hardtail/Frames-Forks/Frames/Cotic/Cotic-Bfe-Classic-Frame/

Mount B-Post Caliper to IS (F-203/R-183)

im holding this one in my hand right now, this is the rear if im correct ? my m8 gave me 4 different ones to try, the rear should fit as its a B for 183 judging by the hope site and im just missing one for the front cause theres no holes to mount it to the forks on the others

this is it

http://www.chainreactioncycles.com/Models.aspx?ModelID=13739

yeh got the B mount on seems fine, i just need that C mount i presume for a rotor thats a 203?

Yes, that should be it as you have post mount caliper

Anyone got the C mount for sale?