QUICKCHANGE GEARSET 1 3/8",10 SPLINE,#37, 21T/31T

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TOOTH COUNT: 21/31PREMIUM QUALITY WINTERS QUICKCHANGE GEARS10 SPLINEPRECISION MATCHED SETSTO FIGURE EXACT GEAR RATIO, 1ST GET THE SPUR RATIO*SPUR RATIO=TEETH ON TOP GEAR DIVIDED BY TEETH ON BOTTOM GEARTHEN FIGURE THE GEAR RATIO*GEAR RATIO=SPUR RATIO X R&P RATIOCLICK ON THE CHART AT THE RIGHT TO SEE THE RATIOS ON EACH GEAR SET INCLUDING THIS ONE Show more