9T-70T Sprocket kit
Revvi 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