BBB RollerBoys 10 tooth replacement rear derailleur gear jockey / pulley wheels. Compatible with Shimano 7 and 8-speed; Campagnolo 8, 9 and 10 speed; SRAM 9.0 (1997-98), 9.0SL (1998), 7.0 (1997-98) and 5.0 (1998-99).
