Question about changing tire size and fixing speedometer - Ford Powerstroke Diesel Forum
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post #1 of 2 Old 06-17-2009, 09:09 PM Thread Starter
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Question about changing tire size and fixing speedometer

Ok so i have a set of 315/70/17 and i have a programmer that lets me change my tire size to correct the speedometer reading. Well my programmer does not have my exact size to select it has one slightly taller and one slightly shorter (i thank they are 34.50 and 34.25) and my size is in between those. So my question is should i go with the bigger number or the smaller number? Thanks for the help.

05 F250 CC Lariat FX4
SCT X3
4" MBRP turbo back STRAIGHT PIPE
2.5" Leveling Kit
315/70/17 Pro Comp Extreme MT (THESE TIRES SUCK)
17X9 Black Pro Comp Series 7089
Alpine IVA-W205
Polk 5x7's
(2) JL Audio 10W1
Kicker 400.1 Mono amp
All ran with JL audio cables.

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post #2 of 2 Old 06-18-2009, 04:48 AM
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check your tire brands website and see if they list revolutions per mile for that specific size. you can change that parameter on your tuner.
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