Lighter, XTR-grade caliper adapters Includes conical washer for better caliper alignment Works with all post mount calipers Legend : SM-MA90-F203S/Position :Front* R: Rea203 : Rotor size Caliper type: S: Int-A-standard P: Post Suspension/frame type: S: Int-A-standard P: Post B: Boxxer Z: Marzocchi 20mm