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In my Supa I'm running the VDO electronic speed. I got cause when I used to drag race with 195/50's in the front my speed was off by almost 20mph. With the electronic speed I'm able to calculate it to whatever size of tires I'm running. I won't have that ability very long cause I'm going to be going to 944 guages so hopefully 205/40R17's will be somewhat close OD as the 944's original tires.
Nick
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