Taller tires for pickup?(do they increase mileage?)

[aktacoma]

so 1900 RPM would put me right at 1184 ft/mn but to do that I would have to run 31 inch tires I think the 29.6 tires should work just fine at 55 i should be running exactly 1900 rpm per a off road guys calculator to get final drive and rpms at different speeds, I dont want to go any bigger and not be able to go up hills or always be down shifting the calculator is here for anyone interested in difference in rpm for different tire sizes or gear ratios
Gear Ratio Calculator

[wdb]

Originally Posted by mcrews

Scangauge has a setting screen where you calibrate to the actual speed.

That's what I thought. I've never had a lot of luck with the calibration function on my scangauge. I'd adjust it, the mileage would swing in one direction. I'd adjust it back the other way a tad, and the mileage would swing in that direction. I used to calibrate instruments for a living, and the scangauge showed me all the signs of having too coarse a level of granularity to do any meaningful calibration. So I left the calibration alone, and now I treat the readings as a relative measure.

I would not suggest that anyone seriously use a scangauge as a speedometer.

[aardvarcus]

Yokohama Geolander

Size-Service Description-Load Range-UTQG-MaxLoad-Max.InflationPress.-TreadDepth-TireWeight-RimWidthRange-Meas.RimWidth-Sect.Width-TreadWidth-OverallDiam.-RevsPerMile-Countryof Origin*
30X9.5R15LT
104SC
None
1985 lbs. 50 psi 16/32" 38 lbs. 6.5-8.5" 7.5" 9.7" 7.6" 29.6" 699 JP

Note no UTQG is given, but similar sizes have 500AB, which seems reasonable for an all-terrain tire. I also do not know if you have steel or alloy wheels, but that tire is technically to wide for 15x6 steel wheels, but would work on 15x7 alloys. Also it seems a bit heavy, is a LT rated tire really necessary for how you are using your Tacoma?

Just for the sake of pointing out other options, if you were to consider P rated tires, there are similar sizes that are a good bit lighter such as the Michelin A/T 2, which is only slightly shorter (2.4%) but is 18.8% lighter. Even if you “derate” the max load of the P rated tire by 10% for truck use, you will still have a similar load capacity.

Size-Service Description-Load Range-UTQG-MaxLoad-Max.InflationPress.-TreadDepth-TireWeight-RimWidthRange-Meas.RimWidth-Sect.Width-TreadWidth-OverallDiam.-RevsPerMile-Countryof Origin*
P235/75R15
108SXL
500 A B
2183 lbs. 50 psi 14/32" 32 lbs. 6-8" 6.5" 9.3" 7.1" 28.9" 721 CA

If you are willing to go to less all terrain tires and more street able tires, you have options such as the Michelin M/S 2 which is similarly less heavy, but according to the UTQG should have a much longer tire life.

Size-Service Description-Load Range-UTQG-MaxLoad-Max.InflationPress.-TreadDepth-TireWeight-RimWidthRange-Meas.RimWidth-Sect.Width-TreadWidth-OverallDiam.-RevsPerMile-Countryof Origin*
P235/75R15
108TXL
720 A A
2183 lbs. 50 psi 12/32" 31 lbs. 6-8" 6.5" 9.3" 7.3" 28.9" 721 CA , US

If you are uncomfortable running on “street tires” in the winter, you may consider looking for a cheap set of factory takeoff wheels from another Tacoma and doing a summer/winter rotation. Not necessarily because you need crazy mudders to get through the snow, more for keeping from ruining your good all terrains pounding the pavement all summer. Notice that most all terrains have a UTQG “B” Temperature Rating.

(Sorry the tables with the tire info are messed up.)

[aktacoma]

Originally Posted by aardvarcus

Yokohama Geolander

Size-Service Description-Load Range-UTQG-MaxLoad-Max.InflationPress.-TreadDepth-TireWeight-RimWidthRange-Meas.RimWidth-Sect.Width-TreadWidth-OverallDiam.-RevsPerMile-Countryof Origin*
30X9.5R15LT
104SC
None
1985 lbs. 50 psi 16/32" 38 lbs. 6.5-8.5" 7.5" 9.7" 7.6" 29.6" 699 JP

Note no UTQG is given, but similar sizes have 500AB, which seems reasonable for an all-terrain tire. I also do not know if you have steel or alloy wheels, but that tire is technically to wide for 15x6 steel wheels, but would work on 15x7 alloys. Also it seems a bit heavy, is a LT rated tire really necessary for how you are using your Tacoma?

Just for the sake of pointing out other options, if you were to consider P rated tires, there are similar sizes that are a good bit lighter such as the Michelin A/T 2, which is only slightly shorter (2.4%) but is 18.8% lighter. Even if you “derate” the max load of the P rated tire by 10% for truck use, you will still have a similar load capacity.

Size-Service Description-Load Range-UTQG-MaxLoad-Max.InflationPress.-TreadDepth-TireWeight-RimWidthRange-Meas.RimWidth-Sect.Width-TreadWidth-OverallDiam.-RevsPerMile-Countryof Origin*
P235/75R15
108SXL
500 A B
2183 lbs. 50 psi 14/32" 32 lbs. 6-8" 6.5" 9.3" 7.1" 28.9" 721 CA

If you are willing to go to less all terrain tires and more street able tires, you have options such as the Michelin M/S 2 which is similarly less heavy, but according to the UTQG should have a much longer tire life.

Size-Service Description-Load Range-UTQG-MaxLoad-Max.InflationPress.-TreadDepth-TireWeight-RimWidthRange-Meas.RimWidth-Sect.Width-TreadWidth-OverallDiam.-RevsPerMile-Countryof Origin*
P235/75R15
108TXL
720 A A
2183 lbs. 50 psi 12/32" 31 lbs. 6-8" 6.5" 9.3" 7.3" 28.9" 721 CA , US

If you are uncomfortable running on “street tires” in the winter, you may consider looking for a cheap set of factory takeoff wheels from another Tacoma and doing a summer/winter rotation. Not necessarily because you need crazy mudders to get through the snow, more for keeping from ruining your good all terrains pounding the pavement all summer. Notice that most all terrains have a UTQG “B” Temperature Rating.

(Sorry the tables with the tire info are messed up.)

I'm not up sizing any then, I already have 235/75 R15
I will have to check whether or not the width of the rims is 6 or 7 inches

[mcrews]

Originally Posted by wdb

That's what I thought. I've never had a lot of luck with the calibration function on my scangauge. I would not suggest that anyone seriously use a scangauge as a speedometer.

have to disagree. I run a garmin gps and scangauge. the scangauge is alway corrct to the garmin (after first calibration) It might be a tad (1 second) slower to change, but it is always accurate.
Over 100k on the scangauge and two different cars

[aktacoma]

rims say in door jam 15x 6jj I assume this means 6 inches wide shoot

[mcrews]

I ran a tire that was for 8-9 when my rim was 7.5, it worked for to sets of tires (40k+ on ultra sport summers 255/45/18 - 245/45/18 was factory.)

if it's 1/2 an inch you should be fine.

[CapriRacer]

Just an FYI,

Be aware that tire size plays a minor role in rolling resistance compared to the difference in rolling resistance between tires of the same size. While this discussion is about the affect of differences in apparent gearing, I don't want people to think that there is some large gains in rolling resistance simply due to tire size. It's more complicated than that.

[miro]

I've been reading various posts about increasing tire size on trucks and I'm still no closer to my answer.
I've got a 2010 Tacoma 2 wheel drive and I've got 15 inch rims.
When the tires wear out, then I'd like to get a pair of 16 inch rims for the back wheels for the non-winter driving. I use winter tires on 15 inch rims all around during the winter season.
Most of my non-winter driving ( about 85%- 90%) is highway on clean dry pavement at steady speed.
I'm thinking that the 16 inch rims on the rear wheels will help improve MPG. Since I have to buy new tires anyway, why not get larger rims and tires for the back ?

miro

[mallrat]

Originally Posted by miro

I've been reading various posts about increasing tire size on trucks and I'm still no closer to my answer.
I've got a 2010 Tacoma 2 wheel drive and I've got 15 inch rims.
When the tires wear out, then I'd like to get a pair of 16 inch rims for the back wheels for the non-winter driving. I use winter tires on 15 inch rims all around during the winter season.
Most of my non-winter driving ( about 85%- 90%) is highway on clean dry pavement at steady speed.
I'm thinking that the 16 inch rims on the rear wheels will help improve MPG. Since I have to buy new tires anyway, why not get larger rims and tires for the back ?

miro

With a vehicle that new , I'd recommend using the same tire size on all four corners to avoid confusing any ABS/traction control features. Or rather, stick with the oem's ratio for front-rear tire sizes. If they're the same size and you want to go bigger, increase them by the same amount. If they're different sizes and you want to make the back bigger, do some math to figure out how big you need to make the front. Should keep the computer happy. And use the search feature.