tires and wheels

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Apr 11, 2003 | 10:43 PM

usmccowboy

Thread Starter

Junior User

Joined: Mar 2003

Posts: 70

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From: Colorado springs

tires and wheels

I just got done putting new tires and wheels on my truck and man does it look stylin. I got a set of lariat wheels off of ebay, took those crappy steel/chrome wheels off, put the lariat alloy wheels on got, rid of the 265/75's that were on the truck when i bought it, and put on a set of bridgestone dueler a/t revo 285/75 R16's.
man ill tell you it makes a world of difference, it actually looks like a 4x4 now like it should.
just out of curiosity, does anyone know what percent difference the speedo is now? i am gonna go take it to the dealer and have it cald. but in the mean time it would be nice to know!!!

Apr 12, 2003 | 05:29 AM

1BadF-350

Senior User

Joined: Apr 2003

Posts: 135

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From: Maryland

tires and wheels

Measure the outside diameter of the old tires then the outside diameter of the new ones. Find the difference. divide the difference by the o/d of the old tire and you'll get the percentage. My old tires were 31's. My new tires were 38's. so 38-31=7 then 7 divided by 31= .225. The new tires are 22% bigger than the originals so I'll be going 22%faster than my speedo reads. The faster you go the farther off the speedo is. Also I'll need gears that are 22%bigger(numerically) to get back to stock form and can use the same formula to find out.