Thread: Tire Size
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Old Fri, October 16th, 2009, 12:50 AM
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Originally Posted by svt2205 View Post
My speedo has been off since day one with my custom tunes...

My tires are 275/70-18...
Henry,

The reason your tire size is off is because on your custom order form you entered 275/75-18 instead of 275/70-18. This accounts for just over an inch in tire diameter (33.42" vs. 32.39") and will cause the speedo to be off quite a bit.

The current values in the calibration (as you've no doubt noticed) is 2669mm. The correct values should be 2584mm @ 5% squish and 2570mm @ 6% squish.

The files have been corrected and reloaded on the server. You can download then whenever it's convenient.

Take care.
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