255/85r17 Anyone running them?

[PirateMcGee]

Looks like there's one tire available but it seems solid. I like the size but am curious about folks experience.

 

[sancap]

I put some on my 2022 Ram Power Wagon using the stock 17X8 rims. Mickey Thompson Baja Boss E-rated. They balanced easily and run smooth gripping the wet roads nicely. I have about 2000 miles on them with no mud or snow yet. Living in the Tampa Florida area I probably will not see snow anytime soon
Mounted to the rim and aired up they measure about 34.6" Installed on the truck they measure about 34". I run them at 47 PSI-fronts and 50 PSI for the rears. This image compares the original 285/70-R17 duratracs that came with the truck.

 

[PirateMcGee]

I put some on my 2022 Ram Power Wagon using the stock 17X8 rims. Mickey Thompson Baja Boss E-rated. They balanced easily and run smooth gripping the wet roads nicely. I have about 2000 miles on them with no mud or snow yet. Living in the Tampa Florida area I probably will not see snow anytime soon
Mounted to the rim and aired up they measure about 34.6" Installed on the truck they measure about 34". I run them at 47 PSI-fronts and 50 PSI for the rears. This image compares the original 285/70-R17 duratracs that came with the truck.

Looks great! How's your cornering and stability been on the highway/interstate?

 

[plumber mike]

Looks great! How's your cornering and stability been on the highway/interstate?

Is this for your new XD? It was my understanding that a 17” wheel on an XD can only be steel due to caliper clearance issues.
Definitely following along as it looks like a great size.

 

[PirateMcGee]

Is this for your new XD? It was my understanding that a 17” wheel on an XD can only be steel due to caliper clearance issues.
Definitely following along as it looks like a great size.

Yep. Some aftermarket 17s like Methods fit. However, I'm not opposed to painting or powder coating the OEM steelies either. My factory Pro4x wheels I swapped my 275/70r18 snow tires on to from my previous regular Titan so I need wheels anyways for the non cold seasons.

 

[MR. ED]

Got some on my f350. So far, so good. Not much snow around here yet. They have the mountain/snowflake rating which is why I got them. First time in 10 years I didn't get Cooper ST Maxx.

 

[sancap]

Looks great! How's your cornering and stability been on the highway/interstate?

They feel solid on the highways, and feel more secure than the original width tires going thru heavy rains and standing water.

 

[PirateMcGee]

Well, I went ahead and ordered 5 of em and am mounting them on some factory 17s that are being powder coated. I'll post them up once i get them mounted later this week.

 

[dstefan]

I’d be real interested to hear how the Baja Bosses affect your mileage. I've looked at them and been interested in them, but they are a lot heavier than just about any other tire in nearby sizes. I'd love to have that size and toughness, though.

 

[MR. ED]

Same mpgs for me.

 

[sancap]

I only had the stock Duratracs for a couple of thousand miles on my 2022. I don't see much of a difference after having about 2500 miles with the 255/85R17's. Maybe a little better because they are not as wide. I did adjust the speedo so who knows if I am actually getting better milage. It is what it is!

 

[PirateMcGee]

Fit perfectly with OEM powder coated 17s. No rubbing and the spare fits fine.

Sent from my Pixel 7a using Tapatalk

 

[nastav]

I run them on my van and my Grenadier. It’s a pretty good tire in all conditions. The tires on the van have 20,000 miles on them and they have been wearing well With 5k 5 tire rotations

 

[rruff]

Same mpgs for me.

Probably because you are comparing to Cooper ST Maxx which are pretty awful in this respect.

I’d be real interested to hear how the Baja Bosses affect your mileage. I've looked at them and been interested in them, but they are a lot heavier than just about any other tire in nearby sizes. I'd love to have that size and toughness, though.

Weight is irrelevant to rolling resistance. Best proxy for mpg in AT tires is speed rating, but it's best to compare tires of the same size and load. I didn't say it was a great proxy, but it's the best one we have. The Baja Boss has a Q speed rating, which isn't good. If mpg is that important I think a different brand (which would need to be a different size too) with a S speed rating would be a better bet. 285/75r17 options here: https://tiresize.com/tiresizes/285-75R17.htm

Wide tires are heavier because the heaviest parts are the tread and steel belts... but they also tend to have less rolling resistance and require less pressure for the same capacity.

 

[dstefan]

Probably because you are comparing to Cooper ST Maxx which are pretty awful in this respect.


Weight is irrelevant to rolling resistance. Best proxy for mpg in AT tires is speed rating, but it's best to compare tires of the same size and load. I didn't say it was a great proxy, but it's the best one we have. The Baja Boss has a Q speed rating, which isn't good. If mpg is that important I think a different brand (which would need to be a different size too) with a S speed rating would be a better bet. 285/75r17 options here: https://tiresize.com/tiresizes/285-75R17.htm

Wide tires are heavier because the heaviest parts are the tread and steel belts... but they also tend to have less rolling resistance and require less pressure for the same capacity.

I agree once a wheel/tire combo is up to speed, but but what about the initial spool up from a stop or acceleration? Doesn’t the greater inertial mass and weight outboard of the axle centers have some significant impact in exactly the low torque portion of the the power band? I know on my rig with camper and wet weight my mpg went down significantly with the stock 4.30s when I went to 285/75/17 Cooper AT3 XLTs and then came back up a bit, but not to stock MPGs once I went to 4.88s once I provided a bit more torque lower in the curve without having to push the skinny pedal as hard.

Seems like the extra diameter and additional 6 lbs per tire effect on inertial mass can’t avoid hurting mpg, or am I missing something?