Need correct revs per mile please! - Ford Powerstroke Diesel Forum
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post #1 of 5 Old 06-04-2012, 03:22 PM Thread Starter
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Need correct revs per mile please!

I got my sct tuner and need to adjust my revs per mile for tires and get the speedometer at the correct speed, the tires are 37x12.50R17, thanks!

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post #2 of 5 Old 06-04-2012, 03:37 PM
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okay here we go again, you need the circumference in inches, then convert it to ft and then divide the distance (5280) by it. so assuming the the tires really is 37 inches in diameter and using 3.1415 as pi:

5280/((37 x 3.1415)/12) = 545.1 revolutions per miles

sorry if i came off pissy. it's not hard to do this conversion and i hope you know now or can reference this if you need to do it again

94.5 F250 Reg Cab 4x4 5 speed 4.10 276000 plus miles

97 F350 Crew Cab LB 4x4 5 speed 3.55 320000 plus miles (parts truck)



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post #3 of 5 Old 06-04-2012, 03:46 PM Thread Starter
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Originally Posted by terryknight View Post
okay here we go again, you need the circumference in inches, then convert it to ft and then divide the distance (5280) by it. so assuming the the tires really is 37 inches in diameter and using 3.1415 as pi:

5280/((37 x 3.1415)/12) = 545.1 revolutions per miles

sorry if i came off pissy. it's not hard to do this conversion and i hope you know now or can reference this if you need to do it again
Sorry I'm on my iPhone and searched but it came up with nothing even close to what I wanted lol but thanks!

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post #4 of 5 Old 06-06-2012, 01:05 PM
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Originally Posted by Jteets75 View Post
I got my sct tuner and need to adjust my revs per mile for tires and get the speedometer at the correct speed, the tires are 37x12.50R17, thanks!
Hey man try out this website and see what you get.
Tire Size Calculator - tire & wheel plus sizing

I used their calculator for a variety of things. It will show difference between tires/wheels also.

2012 F-250 Lariat
5" Diamond Eye Straight
H&S Mini Maxx
S&B CAI
SkyJacker 6" 4-Link
Bilstein Shocks
Dual Fox Steering Stabilzer
37x13.50x20 Toyo Open Country MT
20x10 XD Strike -24mm offset
AMP Research Power Steps
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post #5 of 5 Old 06-06-2012, 03:15 PM
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Also there can be differences between brands and models, best bet is to go to the brands website, its usually noted somewhere.

2008 (Job 1) F250 King ranch 4x4, snow plow prep package with 2.5 level. Black Maxx, B&W Diehard platinums. Dieselsite coolant and transmission filters, NCU Motorsports/amsoil oil bypass kit. Turbo blankets, 5.5 PMF traction
Please collect and message me Shell, Rotella oil cap codes aka "my miles matter" I'm trying to save up for a hat or something.
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