tire size & speed
02-27-2006, 11:56 PM
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tire size & speed
Just picked up possibly the only recent A8 in Anchorage. It was fitted with 17 inch Pirelli snows & I am sure that the speedo is reading inaccurately high. I realize the tire circumfrence is smaller than the standard 19's so the tire will turn more revolutions in a mile but I would think that something other than wheel turns would measure speed. Am I wrong?
And this is too much for me to extrapolate tonight but could the mileage also be inaccurate ? Or is a country mile a country mile? Thanks.
And this is too much for me to extrapolate tonight but could the mileage also be inaccurate ? Or is a country mile a country mile? Thanks.
02-28-2006, 04:47 AM
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Re: tire size & speed
17" wheels and tires have the same circumference as the 19" set up. Difference is made up in sidewall height. 19" has thinner sidewall height.
02-28-2006, 11:52 AM
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Miles and speed both based on revolutions per mile. They will both read high.
There is a nifty tire size calculator which will give you all the answers. Enjoy... :-)
The speedo is optimistic on the stock tires but the Odo is accurate. Smaller od tires than stock will mess up the Odo too.<ul><li><a href="http://www.miata.net/garage/tirecalcold.html">http://www.miata.net/garage/tirecalcold.html</a</li></ul>
The speedo is optimistic on the stock tires but the Odo is accurate. Smaller od tires than stock will mess up the Odo too.<ul><li><a href="http://www.miata.net/garage/tirecalcold.html">http://www.miata.net/garage/tirecalcold.html</a</li></ul>
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