Use Axial Heavy Duty Bevel Gears in different combinations front and rear.
Use 36/14 Front ~ 43/13 Rear -or-38/13 Front ~ 43/13 - Rear to reduce torque twist in the rear and overdrive the front axle to help pull you through climbs easier.
Use the same bevel gear set in the front and rear to raise or lower your gear ratio.
The heavy duty gear set offers improved gear mesh reducing slop in the drive train.
Spiral cut gears offer increased gear tooth contact and run quieter.
The lower range 43/13 "under drive" gear set reduces torque twist (AXI30402)
The higher range 36/14 "over drive" gear offers higher top speed (AXI30401)
Hardened steel for increased strength and additional weight in the axle