TheBosch E-Bike Sprocketis aHeat treated stainless steel. Bosch E-Bike Sprocket Features Heat treated stainless steel Heat treated chromoly chainring 14T, 15T, 16T, 17T, 18T, 19T, 20T Polished Silver or Black Product Details Retail Price: £18.95 Additional DetailsBrand FSA Brand Name FSA Colour Black Motor Type Bosch Spacing Std Teeth 15T
Best Price: £20.95 from Leisure Lakes Bikes