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Message: <blockquote data-quote="seech" data-source="post: 249792" data-attributes="member: 4572">crymson, at the moment you're assuming that your speedo on the ori tires is accurate. Stock speedos all overread your actual speed, mostly by 5-10kmh over. ie. if the speedo indicates 110kmh, usually the car is only travelling at 100-105kmh.Better you calibrate your speedo yourself. Drive on a highway at a constant speed and time how long it takes to cover 1km. 120kmh=30sec. 110kmh=32.7sec. 90kmh=40sec. 60kmh=60sec. At least then you have a better idea of the approximate 'actual' speed of the car and can then make adjustments to your tire size to get the reading you want.</blockquote>