can I purchase 17" or larger 8 bolt wheels for this vehicle

Asked by Feb 22, 2015 at 11:58 AM about the 2005 GMC Sierra 1500HD 4 Dr SLT 4WD Crew Cab SB HD

Question type: General

The fuel mileage on this vehicle is much to be desired, but this could be due to the
156000 miles. I would like to increase the wheel and tire size,hoping to get a few extra
mpg's from it. Any suggestion to what I can use? It is a work truck used  for both on and
off highway.

2 Answers

65,365

Larger wheels and tires weight more and will increase the unsprung weight. Not only will this affect handling and ride, it will have a negative effect on fuel mileage. Larger tires and wheels almost always reduce fuel mileage.

1 people found this helpful.

The theory is that lots of people think, is that the bigger diameter wheel/tire will take you a little further for each turn, at same rpm of engine as before, and increase mpg. And it even might,at high speed, but only a miniscule amount, but is far out weighed for exactly the reason Bob said. It will only be worse, especially for the work you do with the truck, off road, your gear ratios will all be higher, including final drive, causing the engine to work harder to just get you moving

1 people found this helpful.

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