The Ultimate Ride or Die Tuttio Setup Guide: Supermoto Conversion and Dirt Wheel Walkthrough
By James H. Sterling
Tire diameter directly dictates overall drive rollout. The outer circumference of a 110/100-18 knobby tire measures roughly 2,095mm, while a 150/60-17 street radial measures approximately 1,930mm. Running stock 14/48 dirt gearing on 17-inch wheels dramatically shortens your gearing, leaving the engine screaming at redline at typical highway speeds.
For street conversions, shift to a 15-tooth front countershaft sprocket and a 42-tooth rear sprocket. This drops the final drive ratio from 3.43 down to 2.80, lowering engine RPM at 65 mph while providing long, usable gears for city commutes. If you are building a dedicated stunt bike setup focused on balance-point wheelies and slow-speed maneuvers, choose a middle ground like a 14/45 setup to retain low-end throttle response without sacrificing all top-end usability.
James Sterling reports on renewable energy developments, climate policy, ecological conservation, and green tech innovations around the globe.
