Andrews Belt Drive Transmission Pulley - 34T (Smooth Cruising) 290340 29-tooth power sprocket provides a 9% higher gear ratio advantage over stock 32-tooth sprockets; 30-tooth power sprockets provide a 6% higher gear ratio advantage At 60 mph, 34-tooth overdrive sprockets reduce engine speed by approximately 240 rpm, with less noise and vibration Machined from heat-treated, gear-quality steel Made in the U.S.A.