Take a stock wheel and lay a straightedge across the back of the "rim" part, and measure from the face of the hub to the straightedge. That's the backspace of the wheel. You can figure the offset of the drag wheels if you take the width and divide it by 2, then subtract the backspace from that. Then convert it from inches to mm by multiplying the inches by 25.4. If you match the stock offset of 46mm (same for all generations of eclipses/talons/lasers) you will have very little torque steer and the car wont wander and twitch when you hit ruts. If you dont stick close to the stock offset and switch to say, a 40mm offset (a very common offset in aftermarket wheels that fit our cars) then the car will have terrible torque steer and will wander alot more. It may not be bad on some cars with stock bushings and power steering, but it was horrendous on mine, I didnt have power steering when I had the 40mm offset wheels on. I have stock wheels on now that I finally hooked my PS back up, so I dont know how much that affected it. The only downside to sticking with a 46mm offset is that it limits the width of the tire you can fit, because you can only add equal amounts of tire on the inboard and outboard side of the wheel. If you go to a lesser offset, you can put wider tires on because the wheel is offset farther outboard. That's why alot of people go to 38mm offset wheels when they jam 245mm tires on a DSM.
Hope that helps explain something.
