I have wheels on my car that are currently 18x7.5 and 20 offset. I want to go with a smaller wheel like a 16 inch or 17 but I dont want to sacrifice my width of wheel I have. I have a mid engine rear wheel drive mr2 and I need fat back tires to keep traction. If i get a 16x7.0 and 40 offset is it going to be skinnier? Which number affects the width and what is the offset in relation to the width?
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In wheel measurement, your 18x7.5, means that the diameter of the rim is 18 inches and the width is 7 1/2 inches. I'm not sure where you got the 20 offset, offset is a measurement from the back of the wheel to the mounting plate. you would need to buy different tires for the wheels, a 16x7 would work, the half inch narrower wheel will accommodate the width but if you are buying new wheels and tires go for the 7.5 or 8 inch wide. There are other things to consider also. If you use a tire of the same height, the sidewall height will increase, allowing more sidewall flex which will alter the handling characteristics of the vehicle,(ie..rollover).
