The larger wheels will make a vehicle rev lower at higher speed than a vehicle with stock wheels, therefor the speedo's going to read lower than the actual speed and the lower gears are going to do the opposite, increasing rpms and thereby increasing torque. These two cancel each other out when you're running 35s or so and you end up with a speedo that reads as acurate as stock instead of over-reving your engine as it would do if you ran it with stock 245/75 tires or what have you. I think WomBAT and Air Amigo are both 5 speed manuals too which may or may not make a difference in what you're talking about. I hope that helps and wasn't just a bunch of useless rambling <img border="0" alt="[Hillbilly]" title="" src="graemlins/notooth.gif" /> .