Are MT Baja Boss AT noticeably sluggish on a Braptor?

[MGF]

The MTs weigh 80lbs compared to OEM BFG at 65lb and other alternatives like Toyo ATIII at 73lbs, Falken AT4W at 78lbs.

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[BUFF]

I had the 37” MTs on my Jeep. The glaring difference I find between the KO2s and MTs is the 1” in circumference at the same psi. Haven’t put on the BRapter yet but will on my next set. Stiffer sidewalls on the MTs. Buy a procal tune, I did.

 

[swamp2]

I weighed my factory stock 37 K02s between 70 and 73 lb with a very accurate scale. My MTBBs weighed right on spec at 80 lb. I don't feel any difference and you can't either. This, accounting for the doubling effect of rotating mass, is the some as having a 56-80 lb kid riding in your ~6000 lb truck.

 

[swamp2]

I had the 37” MTs on my Jeep. The glaring difference I find between the KO2s and MTs is the 1” in circumference at the same psi. Haven’t put on the BRapter yet but will on my next set. Stiffer sidewalls on the MTs. Buy a procal tune, I did.

I didn't measure their diameters nor radii, but I did chalk test both. Low 30s in the K02s vs. mid 20s for the higher load rated MTs reflect the stiffer MTs. I knew they would be lower but wasn't expecting that low.

 

[MGF]

I didn't measuredtheir diameters nor radii, but I did chalk test both. Low 30s in the K02s vs. mid 20s for the higher load rated MTs reflect the stiffer MTs. I knew they would be lower but wasn't expecting that low.

Chalk test new to me. Does that somehow measure contact patch?

 

[Paul's silver pony]

I'm a total fan of the Mickey Thompson baja boss at had them on May vehicles. The best.

 

[vrtical]

The answer is no, but I also offset them with way lighter wheels, the OEM ones are boat anchors. My net corner weight is +7.4 lbs.

https://www.bronco6g.com/forum/thre...acing-wheels-and-mickey-thompson-tires.77336/

 

[Brian_B]

Chalk test new to me. Does that somehow measure contact patch?

Yup. Very simple test to measure exactly that. Just need a bit of asphalt or concrete to drive over, and a stick of sidewalk chalk.

 

[swamp2]

Cover a few knobs fire/aft thoroughly with sidewalk chalk. Roll vehicle very slowly over smooth/flat concrete or asphalt for 100' or so. If more dense chalk remains in the center of the tire you are under inflated, more dense on edges over inflated. Lather, rinse, repeat. Very accurate. Optimizes for wear and contact patch, NOT for mpg. The latter requires overinflation and that number will be on your door sill placard.

EDIT: Mine were very close to just a tad overinflated at 26 psi (warm). I was surprised how low compared to stock, even knowing they are a heavier load rating.

 

[Brian_B]

My 35” MT Baja Legends chalk tested at 32 psi cold, and I ran them there for 50k miles - still had 9/32 of tread but they chunked out from desert rock

My 38” Nitto Ridge Grapplers chalk test at about 28 psi cold, but i run them at 30-32 to keep some fuel economy. They are wearing faster than the MTs did but not rediculously

 

[5POINT56]

I had the 37” MTs on my Jeep. The glaring difference I find between the KO2s and MTs is the 1” in circumference at the same psi. Haven’t put on the BRapter yet but will on my next set. Stiffer sidewalls on the MTs. Buy a procal tune, I did.

I have the ProCal installed on my BRaptor. Does it require recalibration if I switch to different 37’s? Like the MT’s?

 

[MGF]

Cover a few knobs fire/aft thoroughly with sidewalk chalk. Roll vehicle very slowly over smooth/flat concrete or asphalt for 100' or so. If more dense chalk remains in center you are overinflated, more dense on edges under inflated. Lather, rinse, repeat. Very accurate. Optimizes for wear and contact patch, NOT for mpg. The latter requires overinflation and that number will be on your door sill placard.

EDIT: Mine were very close to just a tad overinflated at 26 psi (warm). I was surprised how low compared to stock, even knowing they are a heavier load rating.

Seems counterintuitive - if you have more center tire contact from over inflation won’t it wear more of the chalk off the center of the tire?

 

[Squatch]

Seems counterintuitive - if you have more center tire contact from over inflation won’t it wear more of the chalk off the center of the tire?

Clarification: you are looking at the chalk on the asphalt, usually, but your intuition is correct.

https://www.intercotire.com/node/80

 

[Spooled]

My Falken R/T01's are 82lbs a piece. There was a noticeable difference in performance as well as fuel economy. The trade-off being I know they will hold up off-road and are much tougher.

 

[Brian_B]

I have the ProCal installed on my BRaptor. Does it require recalibration if I switch to different 37’s? Like the MT’s?

The engine tune no.

The speedometer, maybe slightly, depending on how accurate you want it.

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