Seller notes

Fits into existing 5-speed cases; lowers the rpm at cruising speeds 1st through 3rd gears are straight cut (spur) for strength during maximum acceleration with no parasitic axial thrust 4th and 5th gears are automotive style helical gears for quiet and smooth operation as highway speed approaches 6th gear is direct drive which means there is no underdrive or overdrive in top gear which translates into 99% efficiency for minimum parasitic loss, minimum wear and tear, and maximum fuel efficiency T...

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