Option 1, 34.9mm 2, 31.8mm —————————————————————————— Model: FD-TY710-2 Level: Tourney Speed: 2 x 7/8 Speed Compatible chain: HG 8/7/6-speed Mount: Clamp-on Clamp Band size: 31.8mm/34.9mm (31.8mm=34.9mm with adapter) Action: Top swing Cable route type: Dual-Pull(Top and down pull) Top gear teeth: 46T Total capacity: 16T Weight: approx 160g Easier and comfortable front shifting Versatile performance and wide compatibility Precise SIS shifting on a 2x9 speed drivetrain
