255/75/r17

i currently have the stock 265 70 r16 tires and rims and wanted to convert to 255/75/r17. what size aftermarket wheel will i need to run these tires? and since i have the 6 speed will the taller tires help with freeway mpg?

 

lets not all respond at once

 

Maybe if this was in the wheels & tires section you would get a prompt response. You would want a 17x7.5 or 17x8 (check with tire manufacturer specs so you know the least and most width you need on a wheel) and ideal backspace is 4.5 inches.

 

I am thinking about going with this size too. What did you end up doing?

 

I have this tire. It wont improve MPG and increases RPMs at cruising speed. Granted I went from an AT to an MT. I have 7.5 backspacing I believe on my tundra wheels, and have had zero issues, Im sure stock tacoma 17s will work. Its a great tire size for a small or no lift truck. Look on craigslist for used tires in this size and I can assure you you will find someone with a jeep wrangler who stepped up to 33/35's and is selling their dunlops or BFG KM1's cheap. Thats what I did and I got a smoking deal. Additionally, if you shred a tire it should be pretty easy to replace because there are a billion wranglers who use this tire.

I have had no problems rubbing even stuffed.

 

How would it increase RPM's at cruising speed if it's a larger diameter than the OEM tires ?

 

?

 

wut

 

I have the same question as you. Guess x2 would have been more appropriate.

 

I ran this size on a set of TRD Sport wheels. I ran em with and without spacers, on a 3" lift with no rubbing.

As for MPG they came after a lift and I went with LT instead of P rated (wish I would've gone P) and it definitely hurt my MPG.

As for OZ.. yeah my highway RPM's went down. No idea what that guy is smoking.

 

I am planning on putting a set of 255/75/17 silent armors over the weekend. Hoping not to see a big decrease in mileage vs 265/65/17.

 

greenrustic, it can't increase your RPM's at cruising speed unless you mess with gearing.

 

Taller tires will not help highway speed MPGs. Taller tires = higher RPMs.

 

Umm... no, taller tires = lower RPMs at the same speed. And when I went from 265/65R17 to 265/70R17, my highway MPG did get better.

 

Really? Because when I came from a 265 to A 285 my MPGs went down the drain I'm usually at 2k at 70 MPH.

 

Because you went to a wider tire... Keep tread pattern and width the same, increase the height just a little, like from a 65 to a 70 series, and your highway MPG's will get a little better (obviously pending the driver). Going to a 285 will hurt MPGs, wider tires will do that.

 

I've always thought it has to do with the height of the tire and the weight of the tire. Higher A tire = higher RPMs

 

Unless you've done some recalibrating when you think you're doing 70 you're actually doing 75ish. difference in circumference is 7 and a bit percent.

someone correct me if im derping here... but the spedo - tach ratio will stay the same regardless of tire size for a specific gear.

 

A taller ( larger diameter ) tire travels more distance per axle revolution than a shorter ( smaller diameter ) tire , therefore you either ;

1) go faster on the taller tire at the same RPM

or

2) go the same speed at a reduced RPM

 

There are tonnes of factors. Tread design impacts rolling resistance, increased weight makes the tire harder to turn, wider tire makes the tire have more wind resistance (and usually weight).

Not sure how a larger diameter tire could increase rpm at a given speed? It may required a lower gear to have adequate power to turn the tires, which would increase rpm..