about how much top end speed is gained and bottom end lost per every inch bigger tire??

 

Dont have a definate answer for you, but it really depends on the kind of tire you get, some tires weigh alot more than others. You could probably get a mudlite two sizes bigger and weigh the same as swampers. Alot of poeple have lost top speed with bigger tires, (with GPS) the speedo will read slower anyway do to less rotations. This question also depends on what quad its going on, the bigger the engine the less you will notice, but off the line you will notice some loss with all quads.

So I guess what Im saying is there really isnt a direct answer to your question.