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Discussion Starter #1
...Need some assistance from the AllFordMustangs.com Brain Trust:

Will I need to recalibrate my speedometer if I switch from the stock 17" 2008 GT wheels running P235/55ZR17's all the way around to staggered aftermarket 18" wheels running 285/40ZR18's in the rear & 255/45ZR18's in the front?

Any help will be greatly appreciated. Thanks in advance!

- 08GT440
 

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You'll need to recalibrate the revs per mile for the rear tires only. What brand of tire (yes, it makes a difference) :)
 

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Discussion Starter #3
...Nitto 555 Extreme ZR's...

Thanks, STL! :bigthumbsup
 

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Discussion Starter #6
...Thanks again, STL!...

By the way, do you know how far I would be off from the stock setting?
 

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Discussion Starter #8
Thank you! :bigthumbsup
 

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Recalibrate Speedo?
If you've gained a bunch of weight, it's definitely better to retire your Speedos than recalibrate them.
 

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Love the sense of humor Gary!
 

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