Avid BB7 Mechanical Disc Brake Mountain Front/RearThe Avid BB7 Mechanical Disc Brake for Mountain Bikes comes with everything you need to convert the kit into a front or rear brake. This includes adaptors for 74mm post mount, 51mm IS front, and 51mm IS. Within the kit contains 1 caliper, mounting hardware, and adaptors. Contains components for EITHER front or rear, not both. Compatible with linear pull brake cables. Lever and cables not included. Single unit with hardware weights only 380 grams. Does not contain Rotor710845783562