Caliper adapters Home › Forum › Bike Forum › Caliper adapters Overview Bike Forum Chat Forum For Sale Wanted Forum Help Classified Rules Viewing 4 posts - 1 through 4 (of 4 total) Caliper adapters bigyinnMember Can i use a PM to IS 203mm adapter designed for the front on the back? Im not 100% sure that i can, but the front and rear calipers are identical post mount jobbies. Cheers Posted 9 years ago coatesyMember Afraid not,same mount on front and back will require a 20mm bigger disc on the front. Posted 9 years ago julianwilsonMember …so you could with a 183mm rotor on the back to go with it. You’ve really go to be going some (and have fantastic rear tyre grip, else it just locks and skids like my 160mm one does) to need a 203mm rotor on the back too. Posted 9 years ago bigyinnMember Already have a 185mm rotor, just thought i’d give it a try seeing as i have all the bits to do it now! Posted 9 years ago Viewing 4 posts - 1 through 4 (of 4 total) The topic ‘Caliper adapters’ is closed to new replies.