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Hello everyone. I really enjoy this forum - lot's of useful stuff.

I tried the search function to no avail. I was wondering if anyone knows how I should have my speedo calibrated with the following wheels/tires:

Boss 304 - 20"
Toyo Proxes - 255/45 R 20

My dealer needs to know how many revolutions/mile or kilometer with the new setup. Perhaps even what the new vs. old diameter of the whole assembly is.

I would appreciate it very much. I would post pix by I really don't know how! :rolleyes:

Thanks again and god ridin'

The Chan
 

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The dealer is only able to change tire sizes between the Base 300 tire size, to the touring's and the "C"'s tire size.

They cannot input aftermarket tire sizes to compensate for a difference. I suggest you check the 20" and 22" Wheel FAQ in the FAQ/Tech section for extensive info on this.

255/45/20 is about the same rolling height as the factory 18". You don't need any calibration.
 

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I just put some new shoes on today...MC2's (Forged) with 255/45/20 Nittos. Just got back from driving it. I did extensive research and went with the tire size I did for the very reason that it is within 1 mph vs the stock tires. You're set if you go with this size tire.
 
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