Avid 20mm Disc Post Spacer Kit If you need to size up your brake caliper for larger rotors, the Avid 20mm Disc Post Spacer Kit has you covered. If you've switched from 160 - 180mm or 180 - 200mm rotors, this spacer kit will adapt your rotors to the proper size. The kit includes titanium CPS bolts, a 12. 5 and 17. 5mm spacer, and concave/convex washers. Features Adapter set for sizing up 20mm on disc brakes Includes titanium bolts as well as spacers and washers | Avid | 20Mm Disc Post Spacer Kit | Titanium | Cps Bolts