Sram: Post Bracket - 20 P (Front180/Rear 160) (Includes Bracket & Stainless Rainbow Bolts) - Standard MountCOMPATIBLE WITHDB-APX-A1, DB-BLBG-5M-A1, DB-BLBG-5R-A1, DB-BLBG-7M-A1, DB-BLBG-7MS-A1, DB-BLBG-7R-A1, DB-BLBG-7RS-A1, DB-BLBG-7RSL-A1, DB-CODE-A2, DB-CODE-R-A2, DB-CODE-R-B1, DB-CODE-RSC-A1, DB-DB1-A1, DB-DB3-A1, DB-DB5-A1, DB-DB8-A1, DB-G2-R-A1, DB-G2-R-A2, DB-G2-RE-A2, DB-G2-RS-A1, DB-G2-RS-A2, DB-G2-RSC-A1, DB-G2-RSC-A2, DB-G2-ULT-A1, DB-G2-ULT-A2, DB-GDE-R-A1, DB-GDE-R-B1, DB-GDE-RE-A1, DB-GDE-RS-A1, DB-GDE-RS-B1, DB-GDE-RSC-A1, DB-GDE-RSC-B1, DB-GDE-T-A1, DB-GDE-ULT-A1, DB-LVL-A1, DB-LVL-T-A1, DB-LVL-TL-A1, DB-LVL-TLM-A1, DB-LVL-TLM-B1, DB-LVL-ULT-A1, DB-LVL-ULT-B1, DB-X0-B1, DB-XX-A2  SPECIFICATIONSMounting Interface: Post mount (20mm bracket) 20PRotor Size Increase: 20Type (Mount Brackets): BoltWasher Stack: StandardMaterial (Mount Brackets): Stainless Steel