front sprocket 420 - 13 teeth for Derbi Senda GPR, Aprilia RS RX SX, Gilera RCR, SMT (D50B0) = IP38030-13

This is a discontinued item. We supply you substitute product with order number: IP38030-13

Low-cost sprockets in various tooth sizes. Chose a taller gear for higher top end, or a shorter gear for improved acceleration. Ratio of 1:2 will achieve optimal results. 13T sprocket for 420 chain.