35 vs 37 MPG

[Stan G]

What kind of a ride difference would you see going from a normal 27-30" F150 tire to 37s? (Asking for a friend )

 

[GordoJay]

What kind of a ride difference would you see going from a normal 27-30" F150 tire to 37s? (Asking for a friend )

Seems like it would be noisy and bumpy with all the ripping and tearing at the fenders...

 

[Stan G]

lol! I meant going from a "normal" ford f150 to a 37" raptor! hahaha

Seems like it would be noisy and bumpy with all the ripping and tearing at the fenders...

 

[spizike9]

Sorry, the 20” are taller. It’s not so much about weight, as it is rolling circumference.
You will notice a definite performance difference from one to the other. Good luck going A to B with those big meats! Ha

It very much is about weight. You don’t think if you have two different sets of 35” tires and one set weighs 25lbs more per tire you’re not going to see a decrease in acceleration, braking and MPGs?

 

[muditup]

No, I don’t. The two trucks I used as an example the 20” had an all season 265’s and the 18” had duratrac 285’s. I’m not a betting man but I think it’s a safe bet to assume the 18’s weighted more. I wonder why the truck with the 18”s was notably quicker. Hmmmm go figure.

 

[muditup]

Shorter tires = faster rev’s = more power.

 

[BoostCreep]

Shorter tires = faster rev’s = more power.

Umm, no. No more power, just a different final drive ratio.

You can’t compare 265s vs 285s without knowing the aspect ratio, i.e., height. If they’re similar in diameter then any significant increase in rotational weight will decrease acceleration, braking, and handling characteristics.

 

[spizike9]

No, I don’t. The two trucks I used as an example the 20” had an all season 265’s and the 18” had duratrac 285’s. I’m not a betting man but I think it’s a safe bet to assume the 18’s weighted more. I wonder why the truck with the 18”s was notably quicker. Hmmmm go figure.

The tires on the 18” could have and probably weighed more, but the 20” rims almost certainly weighed more than the 18” rims.
What was the aspect ratio of each tire? What was the load range? Without that information you can’t make a knowledgeable estimate.
I may be waisting my time with you though. There is no doubt having a bigger circumstance tire will require more power to turn a full revolution. (You’ll also go further per rotation) However if you take two identically sized (dimensionally) tires and one weighs 25lbs more than the other, the heavier will require more power to accelerate/brake than the other.

 

[muditup]

Lmao….take a 37” raptor and a 35” raptor and I bet the person driving the 37” will be able to tell if I have a tail out!

 

[RotorOver]

Unsprung weight (wheels, tires, etc.) is actually about a factor of 3-4 greater. So a 1 lb difference in tire weight for example, is equivalent to about 3-4 lbs of rotational mass.