Product Description [R31W271] Parts for GRK Gear Differential Set Drive cups to be combined when using 10T, 11T, 12T ring gears.
Use as a spare part in case of damage or loss.
Combinations of ring gears and drive cups 39T ring gear for 10T, 11T, 12T → Use in combination with 29.5mm and 28.4mm. 39T ring gear for 16T, 17T, 18T → Use in combination with 29.5mm and 26.4mm.
