SUNSHINE Cassette Bicycle Ratchet Cog 11 12 13T Sprocket 12 8 9 11 Speed Pinion Bike 10v Cogset Single Speed Freewheel Adapter

Specification:
·Material: Steel
·Compatibility: 8/9/10/11 speed
·11T:Diameter:Approx.45mm/1.77inch
·12T:Diameter:Approx.50mm/1.97inch
·13T:Diameter:Approx.53mm/2.09inch