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So even if you threw 255's on your stock rims you have to recalibrate your speedo with your tuner? I thought you only had to recalibrate for gears or bigger rims.
You will if the tires are a different diameter from stock if you want to correct the speedo. Check the tire manufacturers websites for their revs/mile and see what the difference is between what you have now and what you are going to install. I went from 235/50x18 in the rear to 295/45x18 and used my Predator to change the revs/mile.
 

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