After researching tire sizing, I've found a set of Dual Sport tires to replace the current knobby tires.
Front Rim: 1.4x19
Rear Rim: 1.6x16
Stock Front Tire: 70/100-19
Stock Rear Tire: 90/100-16
Replacement Front Tire: 2.75-19
Replacement Rear Tire: 3.00-16
Rim to Tire size chart
It looks like my final gear ratio setup is determined. I will have to double check the diameter of the replacement tire before I order any sprockets though.
Max Motor Speed @ 60V: 3750 RPM
Motor to Trans: 1.7:1 (10t to 17t)
Trans to Wheel: 4:1 (12t to 48t)
Max speed: 35.5mph
I also ordered a ton of parts from TNC Scooters, and major components from eBay.
Money spent so far: $507
Wiring plan
