Actual Tire Size Spreadsheet

[jtforrester]

I created a spreadsheet to help me decide which tires to buy. It includes the calculated tire height based off the revolutions per mile from tiresize.com. I thought I would share in case others find it useful since I often see comments and questions about tire size.

I will add more tires to the list, let me know if there is a specific tire you want added and I will add it as I get time and if I can find all the needed information.

Link to spreadsheet (hopefully the link works!).

Note I do not know how tiresize.com came up with the revs per mile, but I assume it came from the manufacturer. I do not know what rim width was used, what pressure they were running, etc. I just grabbed the number from their page and ran it through the simple formula in the spreadsheet. The calculated tire height based on revs per mile seems to be very close to measured height that people have reported in threads I have read.

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[mojocho]

Width of rim will impact the final height. Same tire on rims of 7.5 versus 9.0 will have different results

 

[Alabama Mud Machine]

Kumho Road Venture MT KL71 37x13.50r20 on 20x10 wheel is apparently as close to a true 37" tire as possible... My speedometer is set at 37.00" tires with my Tazer, and GPS shows my speed as dead-on.

 

[NEWBWHEELER]

Your Toyo open country MT seems to be quite a bit off.

 

[RedTRex]

Width of rim will impact the final height. Same tire on rims of 7.5 versus 9.0 will have different results

True, should include on your spreadsheet the wheel sizes that those measurements came from

 

[j.o.y.ride]

Laden or unladen?

Inflated or not?

 

[jtforrester]

Your Toyo open country MT seems to be quite a bit off.

My spreadsheet has information for the Toyo Open Country AT III tires, your information is for the Open Country MT tires.

 

[jtforrester]

Laden or unladen?

Inflated or not?

True, should include on your spreadsheet the wheel sizes that those measurements came from

I agree it would be good to know the wheel width and laden or unladen; however, I was not able to find that information, and, based on a quick google search, it doesn't look like there is a standard for calculating revolutions per mile, so no standard wheel width, tire pressure, load, etc. TireRack has some information here: https://www.tirerack.com/tires/tiretech/techpage.jsp?techid=203.

I believe the spreadsheet can be used for comparisons but maybe not for absolute measurements.

 

[NEWBWHEELER]

My spreadsheet has information for the Toyo Open Country AT III tires, your information is for the Open Country MT tires.

I stand corrected, you are right. I missed that.

 

[jtforrester]

I stand corrected, you are right. I missed that.

No worries, I should probably add some MT tires to the spreadsheet.

 

[guardrail]

spreadsheet link is broken

 

[BSW520!]

spreadsheet link is broken

I don’t think it’s being updated or hosted given the age of last post.
I know installed height on vehicles the measurements are off as I went and measured 3 different tires on jeeps at work on break one day just for curiosity.
My 25 Willys 255/75r17 measured 31-1/4 installed.
25 wrangler brand new installed 285/75r17 terra grappler g3 with a lift supposed to be just under 34” measured 32 3/4 inches. .
23 wrangler small lift and new 35x12.50r20 Toyo open country at3 measured installed 33 1/2 inches. This is no scientific data just my observations my gladiator and the 25 wrangler on stock wheels 7.5 wide. The 23 I believe are 20x9

 

[guardrail]

inflation pressure has a lot to do with it.

i downloaded that spreadsheet last spring but got a new computer in June and cant find it now

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