Shimano 10 Speed Dyna-Sys Pulley / Jockey Wheel Set (MPN: Y5XE98030). Fits most shimano - RD-M675 - RD-M670 - RD-M663 - RD-M640 - RD-M593 - RD-M615 - RD-M610 - RD-5800-SS. Also suitable for use with 9 / 10 speed systems.. Contains: 1x Guide pulley wheel (top) & 1x Tension pulley wheel (bottom)..
Best Price: £7.49 from Merlin Cycles