The Shimano TZ500 6Speed Multiple Freewheel with weight-optimised construction for Tourney TZ 3x6-speed group. Shimano TZ500 6Speed Multiple Freewheel Use: MTB/Trekking Group: Tourney TZ Model: MF-TZ500-6 Type: HG/UG Gear: 6-speed Compatible chain: HG/UG 7-speed
Best Price: £24.99 from Leisure Lakes Bikes