Wheels and tires

[JAMChevy]

Hey guys, I'm thinking of buying SET OF (4) FOUR BRAND NEW takeoff 2007 POLISHED Z-71 Chevy TAHOE OEM 17x7 1/2" 6 lug on 5 ½" WHEELS/RIMS AND CAPS WITH GOODYEAR ROWL P265/70R17 WRANGLE HP M+S TIRES.

My truck now has 16 inch wheels with 245/75/16 on it, and 3:75 deferential. My question is: Is this switch will do any harm to the rear and will that affect my mileage?

Any input, suggestion greatly appreciated

 

John

[averagehonky]

Speedo will be off 3.6% fast. When you're speedo says 60 it's really 58.

[Shocker]

Speedo will be off 3.6% fast. When you're speedo says 60 it's really 58.

 

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according to my calculations, the opposite would be happening. when the speedo says 60, its going 62

[SIERRA2000]

Depending on the year of the truck it could make the transmission shift funny.

[Guest chevydeerhunter]

If the tire diameter is bigger than stock, you'll be traveling faster than your speedo says. My calculations say you'll be going 62 when your speedo shows 60.