Belt Drive Transmission Pulleys for 2007-Up 6-Speed Big Twins

These transmission belt pulleys allow you to change your final drive ratio for faster acceleration or lower RPM cruising on the highway. Installation notes – Changing the final drive ratio will affect speedometer reading; ECM adjustment or a Speedometer Calibration Module may be required to correct reading. Generally speaking, a 1-tooth change can be performed without a belt length change; more than 1 tooth may require changing belt length. Rear axle position adjustment required for each pulley tooth change is +/-.125″ (3.2mm), while rear axle position adjustment required for each belt tooth change is +/-.280″ (7.1mm). Check axle travel and availability of belts before ordering!

Pulleys for ’07-up 6-Speed Big Twins – Stock pulley size is 32T. Andrews makes 3 different pulley sizes to allow you to change your overall gearing. 2 smaller sizes (30 & 31) for quicker acceleration or to better handle heavy loads (sidecars, trailers, etc.), or 1 larger size (34) for reduced rpm on the highway. Actual final drive ratio change depends on the year and model; consult chart below for your motorcycle.

06-07 FXD
Stock gearing is 32/70 = 2.960:1 30/70 = 3.157:1 (+6.25%) 31/70 = 3.055:1 (+3.13%) 34/70 = 2.785:1 (-6.25%)

07-08 Touring, 08-16 Dyna®, 07-16 Softail®
Stock gearing is 32/66 = 2.790:1 30/66 = 2.976:1 (+6.26%) 31/66 = 2.880:1 (+3.14%) 34/66 = 2.626:1 (-6.23%)

09-Up Touring Stock gearing is 32/68 = 2.875:1 30/68 = 3.067:1 (+6.25%) 31/68 = 2.968:1 (+3.13%) 34/68 = 2.706:1 (-6.25%)