ok so i think i got this right
for old tire size i typed in
275/65-20 (i believe thats the stock size, havent looked)
that came out to
old diameter 33.37" ( 847 mm )
old circumference 104.83" ( 2662 mm )
old R/mile 604
for the new tire size
285/75-18
which came out to
new diameter 33.98" ( 863 mm )
new circumference 106.75" ( 2711 mm )
new R/mile 594
with a 5% squish on 3.73 gear ratio the effective ratio is 3.66 with a new ratio of 3.79
so i should put 2711mm for the custom options, should i change the gear ratio? or leave it at 3.73??
how will i know i am going faster than 60mph? i have mph as an option on the gryphon but i will not be able to have a police radar me or anything
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2008 White Ford F-150 Lariat Supercrew 4x4 | PHP Gryphon w/ Custom Tunes | 18" XD Monster's | 33" BFG A/T | AS Leveling Kit | Brandmotion iPod Adapter | 6000k H.I.D Lights | Line-X Bedliner | Weathertech Floorliners| True Dual Magnaflow Exhaust| K&N Cold Air Intake| Troyer Performance UD Pulleys
Last edited by th3godf4th3r; Tue, January 13th, 2009 at 03:23 PM.
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