I am hoping to get a tire upgrade soon. I have stock 275 70 R18, tryin to go to 285 75 R18. I know they will fit, but the dealer says they can only go up "1 or 2" tire sizes to calibrate the speedometer. I asked them what constituted "2 tire sizes", and they said they didn't know, they just knew the computer would only let them go 1 or 2 sizes up. So, I was wondering if someone could outline what my options would be for 1 and 2 tire sizes up.... please help, cause the dealer is startin to tick me off!!!
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