Gear, Drive, Speedometer - MATCH YOUR COLOR/TOOTH COUNT TO TIRE SIZE/DRIVE RATIO
BLUE 20T - FRC3310
GREEN 21T - FRC3311
YELLOW 22T - FRC3312
RED 23T - FRC3313
FOR PROGRAMMABLE ELECTRONIC SPEEDOMETER USE - ANY DRIVE RATIO WITH A YBE100530 (Hall-effect sender)