Bracket Fits on all bicycle frames Front or rear ! For frames with no disc brake Tabs —Now you can have Disc Brakes.—BIG size is for front shocks that are 0.9″ -1.25″ thickness. If your front forks are OVER 0.9″thick (like 1.25″) then you NEED our BIG 1.25″ clamps ( They adjust 0.9″-1.25″)— So Choose BIG for front …