I've just bought a 2006 access cab Tacoma with the 2.7l and a 5 speed. What appears to be the original Dunlops have 67000 miles on them. I've narrowed my tire choice down to Toyo Open Country M/Ts in LT255/85R16 (60 pounds) and Toyo AT2s in P265/75R16 (42 pounds). I've also ordered a Trail-Gear lift from Summit Racing to help make some room till the funds are there to do coilovers in the front.

I like the power the 2.7 has and dont wont to lose too much top end. Anyone running the 255/85r16 with the 4 banger? There is a pretty good weight difference in the two tires also, and I know that factors in.

 

With 67000 miles, I'd be amazed if those are the original tires. The dunlop at20's they come with really don't last long.
Unless you're riding on the cords.

Tire weight has minimal effect, limited to acceleration and a slightly increased bouncyness due to increased unsprung weight.
The correct tire size is 245/75R16
What is the reason you are considering a different size?
Bigger (wider or taller) tires won't accomplish anything besides increasing your fuel consumption.

 

285/75r17 or 16. I just installed a lift kit on a 2011 access cab, all i had to do was trim around front bumper and he's golden

 

I'd stick with the 265's. That truck will be a dog with 255's without a re-gear.

 

You do realize that the number you are quoting, is the tire's *width* in mm, right? Re-gearing or not depends on the tire's DIAMETER (how tall it stands off the ground).

You can do a 245/95R16 or a 285/45R16. The latter is a smaller diameter tire, despite the larger first number.

The factory size is 245 width, 75% profile height, 16 inch rims.
Yes, whoever decided to set the measurements using an unholy mix of metric and imperial measurements really does deserve to be shot..

But point is, 245 is a suitable width for these trucks, and in fact, some much heavier trucks get the same width of tires, or even narrower. It is not uncommon for a full size truck to run on 235's -- they get really good traction in the snow.



The MAIN thing to think about, is that the effect of going with a taller tire, is negligible as far as the vehicle's capabilities go, but *significant* as far as required GEARING goes.

The 255/85R16 tires suggested by the OP will, quite literally, only raise the vehicle's ground clearance by 33 millimeters compared to the factory 245/75R16 size. That's only just a little over *one inch*.... while increasing the distance travelled per tire revolution by 8.5% <-- massive.