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Message: <blockquote data-quote="trex92" data-source="post: 1394484" data-attributes="member: 4353">165/60/13 = 165mm x 60% + 381mm (rim size)/2 = 289.50mm radius from center of rim217/45/17 = 217mm x 45% + 431.80mm/2 = 313.55mm radius from center of rimClear difference of 24.05mm ie 2cm bigger radius which translate into about 15.113cm bigger circumference (circumference = 2 x radius x pi). Means now for every full revolution of ur tyre, ur tyre now needs to travel 15.113cm more than compared to previously. Your speedometer reading would be out for sure but question is how much. Last time say 100m, on ur old tyres, ur wheel spun 54.97 times whereas new wheels spun 50.75 times, roughly would translate to about 92% lower speedometer reading now...I am not sure how RSM and digital speedometer takes its reading as it is definitely not mechanical means such as proton's speedometer. But I think it would be out too, but since it is digital and that it is supposed to be installed in any car, this should mean that u should be able to set the digital speedometer easily....</blockquote>

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