gears for 33 X 12.5s

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Aug 20, 2007 | 06:03 AM

#21

colsoncj

Contributing Member

Joined: Jun 2004

Posts: 2,644

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From: Monett, MO (Springfield)

Quote:

Originally Posted by tc

Wow - a whole lot of calculations that are absolutely pointless because they assume the speedo is accurate from the factory - which in my experience, it's not.

If you REALLY want to know there are only two ways:
- time over distance with a stopwatch
- GPS (and even this may not be accurate enough)

We're really only talking about a few % here - you need a REALLY good measurement. Even police radar may be off by enough to not be used.

agreed.... there are a fair amount of assumptions... I've checked mine and its within 3% at 60. (assuming the distance was correctly marked) you reach a point where good enough is good enough, which imho is around 5%.

Another assumption is that your tires are at a true 33" or whatever, which they usually arent, and that they stay at that, which they dont with wear.

I was just giving my 2 cents. The point I was trying to get across was with 4.88's and 33" it brought my speedometer back close enough to what it was before i tinkered with it.