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Inaccurate Speedo
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Posted by Wingnut [Email] (more from Wingnut) on Sun, 17 Jan 2010 06:32:06 Share Post by Email
In Reply to: Wheels - Is bigger better?, Sam, Sat, 16 Jan 2010 21:19:16
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Unless you get lower profile tires that match the exact or very close to the overall diameter of your 16" tires/rims, it's going to throw off your speedometer accuracy. The Tire Rack used to have an on-line chart that would give all the characteristics, including speedometer readings that you could do a comparison against, for rim sizes matched up with various tire sizes. I put lower profile tires on my new 9-5 combi when I bought it in 2006, and it showed the speedometer at around 3 mph faster than it should have. It was a nice cushion for those radar guns as I was actually driving slightly slower than the 5 mph over the speed limit that I normally drive.

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