Tire/wheel speedometer question

[turboclam]

Looking to purchase an 07 Denali that had 26 inch wheels on it. Luckily he still had the 18 inch factory wheels to put back on it. How much will the mileage be off. Or what questions should I be asking. Truck is super clean with no other aftermarket parts. Thanks

 

[INEEDAGN]

depends on the tire size of those 26" wheels. I'm sure they'll still be bigger diameter, but it might not be all that much.

Get the tire size of the 26s and compare it to the OE tire size using an online tire size calculator (miata.net has a good one) and it will give you a percentage off difference. If the thing has been taken care of I wouldn't worry too much about the odometer being off.