IOG = gear drive cams with Inner & Outer drive Gears

Heavy Duty shocks or springs are recommended to be used on motorcycles that are operated at or near the manufacturers maximum load rating over 50% of the time

Fits: > 41-E81 Shovelhead

cam base circle diameters and heights for all M8 engines

Note: Sizes are approximate and for your reference only

10/24 X 1 INCH BUTTONHEAD BOLT CHR. Belt Drive Kits IOG = gear drive cams1 4" 0,250 6,350 mm 3 8" 0,375" 9,525 mm 1 2" 0,500" 12,700 mm 5 8" 0,625" 15,875 mm 3 4" 0,750 19,050 mm 7 8" 0,875" 22,225 mm 1" 1" 25,400 mm 1 1 4" 1,250" 31,750 mm 1 1 2" 1,500" 38,100 mm 1 3 4" 1,750" 44,450 mm 2" 2" 50,800 mm