subi_stout

hey CF,
I just put on my 31's and it was a large upgrade from the pizza cutters i was running (26's maybe) my question: whats the difference in MPh on the speedometer. Im thinking 5-6 mph, and does it get wider the faster i go? Id like to have a general idea since the popo here are A-holes. thanks

~Stout

cdawall

http://www.grimmjeeper.com/gears.html

subi_stout

abt that....

N20jeep

yes, you're speed is off by a percentage. meaning if it is off my 4mph at 20 is would be off by 16mph at 80

N20jeep

you can measure the percentage difference between factory tires and your new tires,

then use that to tell the percentage difference between you speedo speed and actual speed.

i would put the equation for it, but its way to early and my head is pounding.



or, you could just use a GPS, or get the right speedometer gear.


i think the math is
(old tire height) divided by (new tire height) = A

A is your percentage

then (speedo speed) + A%

like this
28 (old) divided by 35 (new) =20% (or .20)

65mph(speedo speed) + 20% = 78mph

but to do this you need the actual tire heights (use a tape measure)

subi_stout

thankyou, that makes sense to me.