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If your planning on doing track runs along with keeping your car a daily driver 17x7 inch rims with an offset of between 50 and 53mm are probably going to be the best in terms of performance and ride quality. With the 17's you're going to lower unsprung weight compared to 18 inch which also require a lower profile tire and that means poorer ride quality. If you have an uprated suspension and don't mind the loss of ride comfort, then 18 incher are going to provide better performance on the track because the increase in unsprung weight is going to be counteracted by the better suspension setup. In this case 18x7 inch rims with a 35 profile and an offset between 50 and 55mm would be the best option.
 
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