GDP - The Most Trusted Name in Portals

With SuperATV's Portal Calculator you can understand how tire size and gear reduction can affect the speed of a vehicle. Plug in your original tire size, new tire size, and original top speed to see what gear reduction you need to meet your needs!


Portal

ORIGINAL TIRE SIZE: NEW TIRE SIZE: ORIGINAL TOP SPEED:
New Top Speed
Tire Size to Get Back to Top Speed
Stock:
15% Reduction:
15% Reduction:
30% Reduction:
30% Reduction:
45% Reduction:
45% Reduction: