9T-70T Sprocket kitRevvi 16″ bikes where originally fitted with an 11t front sprocket and 57T rear sprocket. This kit changes this to a 9T front sprocket and 70T rear sprocket. This will give your bike more acceleration low down but less top speed. The kit includes: -9T front sprocket with washer and Nut-70T Rear sprocket-Chain -Chain guard Please note: This will only fit 16″ bikes with a 170w brushed motor