Hintz

For G56 guys what do you guys think would be the better tire, the 35x12.50 or 285/75/17? I want to get rpms down, and try to pick up a MPG (or a least not lose as much)

rallydriver

Most likely it will be the thinner tire (285/75) that will provide the least rolling resistance and better mpg, but both the 285s and 35s will be heavier than stock, so that needs to be taken into account as well.

Even still, I gained a bit of mileage when I went to 305/65s from the stockers since I was able to drop hwy rpms by ~200-250.

-Chris

snoyes

I'm running the Toyo MT 35s on mine, and while my RPMs are down on the highway, the lift and the heavier tire have dropped my MPG by about 1 MPG on the highway. I would say no lift, and a skinny, tall tire would obviously be the best for better MPG.

BIGDAN65

i just went to 35's i have an auto with 3.73. i was turning 2k at 80 last night

snoyes

And for the RPMs, I went from 2K RPM at about 64 MPH, to being about 73 MPH for the same RPM. The 35s definately helped to drop the RPM on the highway.

matego

I have a NV5600 but I have 35x12.5's and I lost about 1mpg. The r's are a lot lower at highway speed but the tires are very wide and cause more resistance.

Danderson

I'm going with the 285-75-17's next due to these awful fuel prices. I've got some H2's ready to go in the shed,but it looks like 35's are not going to happen.

dubster23

Any big diff. in RPMs with the 285/75s?

aggie06

I have been trying to decide which size to go with for awhile. After seeing the thread with 305's, I may end up with that size. I like the look of a fuller fender well.

Mark Hodowanec

It's too bad that the tire manufacturers won't give us a tall skinny tire like 265/85-17 or a 285/80-17. Right now I'm running 35s & wish that I can get the gear down effect without going to a tire 315 (12.5) wide.

Hintz

I put on 315/70 BFGs hasnt seem to hurt the MPGs, but the speedo is still off

paroxysym

eventhough im running a 48re, the 35s did lower the rpms. i can see it doing the say for the 6spd. they are about an inch and a half wider than the 285s and are heavier. they lower the rpms, which adds up to alittle better mpg. plus they will look better too.

snoyes

Yep,

Seems the tall, skinny tire would be the answer but not a really good answer out there. Maybe as fuel prices increase and there becomes enough demand, they'll start to make one?

Ledfoot

I replaced my 315/70/17 with 285/75/17 and didn't notice any rpm change. Thes two sizes are about the same diameter.

Mark Hodowanec

Does a 285/75-17 exist? Don't you mean 285/70-17? If that's the case then the RPM difference is significant. The 315 has an OD of 34.4 & the 285 has an OD of 32.7" which is a 5% difference (100 RPM at 70 mph).