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How to change tire size?

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Post Sun Sep 16, 2012 4:56 am

Posts: 3
I just got my tuner and I can't figure out how to change my tire size I see where it asks about tire RPM but how do I figure out that? i got 35x12.5r17 if any one can walk me through this would be great. :lol: i googled it and could not find any thing :crashing:

Post Mon Sep 17, 2012 3:05 pm

Posts: 41951
Location: DiabloSport World Headquarters

what vehicle?
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Post Thu Sep 20, 2012 5:29 am

Posts: 3
2004 f-150 fx4

Post Thu Sep 20, 2012 2:42 pm

Posts: 41951
Location: DiabloSport World Headquarters

pick the tune, then select the option to modify the tune, then go to tire size or axle ratio and you'll see a revs per mile setting to adjust for your tires.
make the change, then go back until it asks if you wish to install the tune, and choose yes.
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Post Thu Sep 20, 2012 11:22 pm

Posts: 3
How do I figure out the tire revs? I got 35x12.5r17 on a 2004 ford f-150 fx4 that is my question I have asked lots of people no one knows how to do it :blowup:

Post Fri Sep 21, 2012 12:39 am

Posts: 139
Usually therevs are on the manufacturer web site if not google it there are a number of sites that have tire calculators
Oldsaltydog
2010 silverado cc
BullyDog CAI diablew tuned Intune
Custom cat bak xhaust
5.3L. 3.73 gears 18x10 17ks
Cooper 35x12.50x18 STMAXX"S
7 inches of lift
Victory Red Roll Tide

Post Fri Sep 21, 2012 1:13 pm

Posts: 41951
Location: DiabloSport World Headquarters

20168/height in inches
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Post Sun Sep 23, 2012 4:03 am

Posts: 1
I know this is a dumb question, but in figuring Tire revs per mile, I know you use tire height, but do you use actual tire height or round up or down if your tire height is, say, 33.5 inches? :normal:


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