Stock 255/70/16 versus 265/75/16

[cymmgarcia]

Truck: 2004 Silverado 1/2 ton Crew 2 Wheel Drive 3.73 gears

 

I am considering upgrading from the current 255/70's to 265/75's.

 

The rev's per mile is 5% less. Will this cause a Big Hit in the MPG or Power department?

 

Also any rub issues on a 2 WD Silverado?

 

Thanks in advance.....

[cymmgarcia]

Here's some good info:

 

Stock Tire - 255/70R16 Tire 1 - 265/75R16

 

Section Width: 10.03 in 255 mm Section Width: 10.43 in 265 mm

Rim Diameter: 16 in 406.4 mm Rim Diameter: 16 in 406.4 mm

Rim Width Range: 6.5 - 8 in Rim Width Range: 7 - 8 in

Overall Diameter: 30.05 in 763.27 mm Overall Diameter: 31.64 in 803.65 mm

Sidewall Height: 7.02 in 178.30 mm Sidewall Height: 7.82 in 198.62 mm

Radius: 15.02 in 381.50 mm Radius: 15.82 in 401.82 mm

Circumference: 94.40 in 2397.7 mm Circumference: 99.39 in 2524.5 mm

Revs per Mile: 692.1 Revs per Mile: 657.3

Actual Speed: 60 mph 100 km/h Speedometer1: 56.9 mph 94.9 km/h

Speedo Diff: 5.294% too slow 5.03% too slow

 

Aditionally, the 3.73 gears will be reduced to 3.55 gears.

 

Thanks for the calculator link!

[2004GMC1500CC]

Truck: 2004 Silverado 1/2 ton Crew 2 Wheel Drive 3.73 gears

 

I am considering upgrading from the current 255/70's to 265/75's.

 

The rev's per mile is 5% less. Will this cause a Big Hit in the MPG or Power department?

 

Also any rub issues on a 2 WD Silverado?

 

Thanks in advance.....

 

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I've got the same truck and put on the same size tires. Have had no issues at all, and will in fact go bigger when I buy the next set. When I got the custom PCM, I had them correct for the bigger tires.