12.36 12 Transmission Pulley Rear Wheel Pulley Secondary Ratio Overall Ratio (1.54 Primary) Overall Ratio (1.44 Primary) 29 70 2.41 3.72 3.48 30 70 2.33 3.60 3.36 31 70 2.26 3.48 3.25 32 70 2.19 3.37 3.15 33 70 2.12 3.27 3.06 34 70 2.06 3.17 3.00 29 68 2.35 3.61 3.38 30 68 2.27 3.49 3.26 31 68 2.19 3.38 3.16 32 68 2.13 3.27 3.06 33 68 2.06 3.17 2.97 34 68 2.00 3.08 2.88 29 65 2.24 3.45 3.23 30 65 2.17 3.34 3.12 31 65 2.10 3.23 3.02 32 65 2.03 3.13 2.92 33 65 1.97 3.03 2.84 34 65 1.91 2.94 2.75 29 61 2.10 3.24 3.02 30 61 2.03 3.13 2.92 31 61 1.97 3.03 2.83 32 61 1.91 2.94 2.75 33 61 1.85 2.85 2.66 34 61 1.79 2.76 2.58 Gear Ratio Chart for Final Drive Pulleys Transmission Pulley Stock 5-speed Big Twins come with 32-tooth pulleys. Smaller 29, 30, and 31-tooth pulleys provide stronger acceleration, while larger 33 and 34-tooth pulleys reduce engine speed for smoother cruising. For example, a 34-tooth pulley will reduce engine speed by about 240 RPM at 60 mph. Rear Wheel Pulley Smaller pulleys will reduce the engine speed for smoother cruising. Larger pulleys will raise the engine speed for stronger acceleration. 93 Softail models came with 61-tooth rear wheel pulleys. 94 Softail models came with 70-tooth rear wheel pulleys. 95-99 Softail models came with 65-tooth rear wheel pulleys, and Twin Cam 88 Softail models have 70-tooth pulleys. All other Big Twins equipped with rear belt drive units since 80, have 70-tooth rear pulleys. Primary Drive Ratios A primary ratio of 1.54 (24/37 tooth combination) was stock on all Big Twin models from 85-93. A primary ratio of 1.44 (25/36 tooth combination) is stock on all Big Twin models from 94-05. JIMS “Mega” Transmission Pulley Nut for 5-Speed Models The “Mega” nut features a built in lock plate that stays tight even in high-performance application. Fits all 5-speed models from 93-06. 060650 Sold each Transmission Final Drive Pulley Spacer Fits Big Twin models from 85-93 (not shown). 56250 Replaces OEM 33334-85 (sold each) * Spacer and seal included Aluminum Transmission Drive Pulleys by Belt Drives Limited All new lightweight 7075 super strong aluminum transmission pulleys weigh about 1/3 as much as stock pulleys for extended 5th gear bearing life (4-speed pulleys are constructed of 356 aluminum). And lighter weight means more horsepower to the rear wheel. The pulleys are hard anodized for durability. A wide selection of sizes permits fine tuning of final drive ratio. Includes a new spacer, shaft nut, seal and retaining plate with screws. Made in the USA. For Big Twin Models from 85-06 (except 06 Dyna) 42571 29-tooth 42572 30-tooth 42573 31-tooth 42574 32-tooth 42575 33-tooth 42576 34-tooth Fit Sportster and Buell Models from 91-03 42740 28-tooth 42741 29-tooth 42742 30-tooth Andrews Final Drive Pulleys Change your final drive ratio with Andrews’ transmission pulleys. Precision-machined from heattreated gear-quality steel. Fit 5-speed Big Twins from 85-06. 85-93 94-06, EXCEPT 06 DYNA 24200 * n/a 29-tooth pulley n/a 24322 30-tooth pulley 24201 * 24323 34-tooth pulley
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