Tire Size Markings - What does it mean? - Ford Powerstroke Diesel Forum
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post #1 of 6 Old 01-27-2008, 04:27 PM Thread Starter
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Tire Size Markings - What does it mean?

First, what does this mean:

275/70/R18 (got the R18 part), but apparently, the rim size also play into figuring out the actual tire size (32" or whatever)

Now based off those numbers how big "should" my tire be? I have also read that this might not be much of an exact science since those same numbers on a different tire could actually compute to something else.

My end goal to figure out how off my speedo is since it is running different tires than stock (what is the stock size? 265/70/R16 ?)

thanks for the help.

2001 Excursion Limited 7.3 PSD
4" Exhaust, Ford AIS Filter and Box
DP-Tuner F5 - Current Chip
Diablo Chip (not being used)
Superchips 1705 tuner (My code reader)
Broken Tranny as of 01/29/2011 --> New John Wood Trans shortly after. So far it's been awesome, spendy, but awesome.
Tire: Michelin LTX M/S2 LT275/70R18

**First PSD - Purchased 1/2/2008

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post #2 of 6 Old 01-27-2008, 04:43 PM
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here's a link hope this helps Tire Size Calculator - tire & wheel plus sizing

2002 f-250 4X4 XLT 7.3,
stock tranny
DP-Tuner F6 chip
mbrp ss 4" turbo back exhaust
diy intake with zoodad mod
3 pilllar guage setup with autometer guages Thanks Raul
valve body
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NEXT ON LIST
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post #3 of 6 Old 01-27-2008, 04:48 PM
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here's another link that explains how to figure out your tire diameter 4Lo.com :: Metric Tire Size to Diameter in Inches Calculator

2002 f-250 4X4 XLT 7.3,
stock tranny
DP-Tuner F6 chip
mbrp ss 4" turbo back exhaust
diy intake with zoodad mod
3 pilllar guage setup with autometer guages Thanks Raul
valve body
boost fooler
NEXT ON LIST
torque converter





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post #4 of 6 Old 01-27-2008, 05:00 PM Thread Starter
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Awesome, thank you!

2001 Excursion Limited 7.3 PSD
4" Exhaust, Ford AIS Filter and Box
DP-Tuner F5 - Current Chip
Diablo Chip (not being used)
Superchips 1705 tuner (My code reader)
Broken Tranny as of 01/29/2011 --> New John Wood Trans shortly after. So far it's been awesome, spendy, but awesome.
Tire: Michelin LTX M/S2 LT275/70R18

**First PSD - Purchased 1/2/2008

My Site: mxguy.com
My Forum: allthingsmoto.com
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post #5 of 6 Old 01-29-2008, 09:58 AM
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Yes, I was going to pass on that first link. What I can tell you is the numbers in the tire size refer to its width, aspect ratio, and wheel diameter. "275/70R18" means the tire is 275 mm wide, has an aspect ratio (that is, the width divided by the height) of 70%.

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post #6 of 6 Old 01-29-2008, 10:43 AM Thread Starter
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Thank you! I should have known that all along, but ... you know how it goes

2001 Excursion Limited 7.3 PSD
4" Exhaust, Ford AIS Filter and Box
DP-Tuner F5 - Current Chip
Diablo Chip (not being used)
Superchips 1705 tuner (My code reader)
Broken Tranny as of 01/29/2011 --> New John Wood Trans shortly after. So far it's been awesome, spendy, but awesome.
Tire: Michelin LTX M/S2 LT275/70R18

**First PSD - Purchased 1/2/2008

My Site: mxguy.com
My Forum: allthingsmoto.com
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