Shimano xtr mount adaptor front post to postsm ma90 xtr level machined out lightweight disc caliper mount adapter for post type disc calipers to be mounted to post type forks with 180mm disc rotorsfeatures for post type disc calipers to be mounted to post type forks with 180mm disc rotors disc size 180mm front posta 2 year warranty is offered with all shimano products from chain reaction cycles 3 years on dura ace and xtr products buy shimano from chain reaction cycles the worlds largest o