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Mickey Thompson tires don't measure a true 35 inches

Artsifrtsi

I just wanna go wheeling...
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What's really funny is the Baja Boss MT's I put on the JT are really close to advertised... I measured them installed and off wheel and found that they were all between 34.8 and 34.9 inches. (installed on 7.5x17 inch JT Mojave wheels and run at 34psi)

That was also new... with how chunky the tread is, I expect them to be 33's by the time they are almost bald... lol.

35X12.50R17LTDBlk119Q10.0
8.0-11.0
3,000 lbs @
50 psi.
34.8
 

John Cooper

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Yes, their loaded height won't match the numbers on the sidewall.
Just imagine how mad folks would be if they bought say a 35 12.50 15 and it measured 36 tall that way when it was worn out it would still be 35, I think most folks just wonder around looking for something to gripe about!!!!!

Honestly I thought anyone who had been buying bigger tires, knew they were always a shade shorter than advertised.
 
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mrblaine

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Next thing ya know, people will be expecting a 2x4 to measure 2x4 inches!
See, if you want to bitch about something, that there is something worthwhile. The ignorant peasants sued Home Depot and others because a 2 x 4 S4S doesn't actually measure 2" x 4" which is reserved for rough cut material which is what a 2x4 starts life as. Now due to the morons who didn't want to learn how lumber is measured, we have to have all these stupid little disclaimers on every piece of wood giving you the "actual" size. S4S means it is surfaced on four sides so you don't get splinters in your grubby little crumb snatchers and it meets industry building standards so all stinking walls wind up with similar dimensions and blue prints work.

Sounds odd now but at one point, every mill had their own standard they cut stuff too and very little of the was interchangeable with another mill's product. When it became feasible to move lumber around the country cheaply enough, something had to be done.

(sadly, the dilution of language now fails to distinguish between re-sawn for appearance and rough cut)
 

Artsifrtsi

I just wanna go wheeling...
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Just imagine how mad folks would be if they bought say a 35 12.50 15 and it measured 36 tall that way when it was worn out it would still be 35, I think most folks just wonder around looking for something to gripe about!!!!!

Honestly I thought anyone who had been buying bigger tires, knew they were always a shade shorter than advertised.

It’d be nice for the manf to spec them out as the median tread depth, then you could give a nice tolerance like 35 +/-0.5.

My line of work though… precision measurements. I’ve learned to deal with things like this…
 
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NskLJ

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Wouldn't a more accurate method be to take the weight of the vehicle off the tire and measure the circumference with a flat tape. Then take that number and divide by PI to calculate the diameter? This would take the contact patch (flat spot) out the measurement. You probably still won't get 35" but you might get closer to it.

Many manufacturers are listing revolutions per mile in their specs now. Wether or not that actual or calculated value I don’t know. End of the day “who cares”. I have never gotten out of my Jeep on a trail and measured an obstacle to see if I can clear.
 
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jjvw

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Many manufacturers are listing revolutions per mile in their specs now. Wether or not that actual or calculated value I don’t know. End of the day “who cares”. I have never gotten out of my Jeep on a trail and measured an obstacle to see if I can clear.

I still have no idea how a tire manufacturer knows how heavy my Jeep is, what psi I run, or how they could calculate revolutions per mile for my setup without asking me anything.
 
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starkey480

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I still have no idea how a tire manufacturer knows how heavy my Jeep is, what psi I run, or how they could calculate revolutions per mile for my setup without asking me anything.

Same way Rockjock knows that our front springs give “5 inches of lift”
 
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starkey480

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Why does it have to be RJ? Do any aftermarket spring sellers advertise a variable lift height calculator based on weight?
Could insert any brand in there. Point being tires are a spring. I just picked RJ due to their semi recent change of labeling the same springs from 4” to 5” springs now.
 

Plumber1

Tito's, Tacos and Trails
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Just take the wheel & tire off the jeep. Then measure the tire, inflate the tire until you get the desired height your looking for. Re-install it and you now have the proper 35" tall tires your looking for. Sounds simple to me :unsure:

PS: Your jeep may ride a bit rough but that's fine, after all its all about the look not the function :ROFLMAO:
 
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mrblaine

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Just take the wheel & tire off the jeep. Then measure the tire, inflate the tire until you get the desired height your looking for. Re-install it and you now have the proper 35" tall tires your looking for. Sounds simple to me :unsure:

PS: Your jeep may ride a bit rough but that's fine, after all its all about the look not the function :ROFLMAO:

You know what you don't see? You don't see this discussion on the Conestoga and Train forums, that's what you don't see. 100% true vertical and horizontal size every single time.
 
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freedom_in_4low

Sacred Order of the Coil Spring
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I still have no idea how a tire manufacturer knows how heavy my Jeep is, what psi I run, or how they could calculate revolutions per mile for my setup without asking me anything.

This was discussed in another thread a couple weeks back. The tread, with all it's steel belts, doesn't seem to expand or contract much based on inflation pressure. The hub height changes and the contact patch deflects, but the tread acts somewhat like a tank track and the revolutions required to cross a given distance remains very consistent.