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SportTrac Discussion
Wheels, Tires & Brakes
Adrenalin Tires
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<blockquote data-quote="Len Jorgenson" data-source="post: 1048149" data-attributes="member: 61406"><p>If you change the tire size from original specs, your speedometer accuracy will be affected. Going from the original 255/50R20 the STA came with to the 265/50R20s that I've been using only increased the overall diameter of the tire from 30.0" to 30.4". Didn't have a noticeable affect on the speedometer accuracy, and the sidewall height only increased by 0.2". But, as OvalSports points out, a wider tire (ie: 275mm) should go on a wider rim. You'd also want to reduce the aspect ratio to 45 (275/45R20) to stay close to the overall diameter of 30". Further, from my original post, you have to start worrying about wider tires rubbing on stationary parts when you're turning.</p></blockquote><p></p>
[QUOTE="Len Jorgenson, post: 1048149, member: 61406"] If you change the tire size from original specs, your speedometer accuracy will be affected. Going from the original 255/50R20 the STA came with to the 265/50R20s that I've been using only increased the overall diameter of the tire from 30.0" to 30.4". Didn't have a noticeable affect on the speedometer accuracy, and the sidewall height only increased by 0.2". But, as OvalSports points out, a wider tire (ie: 275mm) should go on a wider rim. You'd also want to reduce the aspect ratio to 45 (275/45R20) to stay close to the overall diameter of 30". Further, from my original post, you have to start worrying about wider tires rubbing on stationary parts when you're turning. [/QUOTE]
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SportTrac Discussion
Wheels, Tires & Brakes
Adrenalin Tires
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