effect of tires on speed - JeepForum.com
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post #1 of 3 Old 08-23-2006, 03:22 AM Thread Starter
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effect of tires on speed

someone out there have a chart or something handy? I know all about changinging the speedo gears and stuff but i am just curious how far off i am with 35's on my 7 bouncing around town.

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post #2 of 3 Old 08-23-2006, 07:32 AM
WTF is that?
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MPH = (RPM x tirediamter) / (336 x Total Gear Ratio)

Total gear ratio is differential gear x transmission gear x transfer case gear(usually 1)
Tire diameter needs to be measured diameter not advertised.

1984 CJ 7, SBC 350TBI, 700R4, D 300, AMC 20, D30, 35" Mickeys, 3.54 Gears, 4" susp. Lift, 2" body lift.

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post #3 of 3 Old 08-24-2006, 07:17 AM
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Here is a link to a site that has a speedo gear calculator on it.

84 CJ7 258, T5, D300, AMC 20, D30 EZ lockers F&R
33" TSL, 2.5"BDS lift, .5" shackle lift 1" body lift
Originally Posted by ftdranger
You guys on the CJ tech page are a little to tech for me. Must be the leaf springs.
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