CORRECTED POST

Posted by Bob on September 28, 2004 at 17:25:17 from (66.163.134.177):

In Reply to: Re: Tire Size = Tractor Speed posted by Bob on September 28, 2004 at 17:20:26:

I copied the wrong numbers for the tire diameter into the previous post. Here is the CORRECTED (I hope) information.

From the Firestone website, here's some info.
The ROLLING CIRCUMFERANCE is the distance the time travels in one revolution, and will vary some between manufacturers and tire models within a specific manufacturer, even though the "offical" size is the same.

15.5-38 ... 184"

16.9-38 ... 198"

So... 184/198=.93

So... Changing the tractor over to the smaller tires would reduce the speed to 93% of the speed it was going with the bigger tires.

The overall diameter of the smaller tires is 61.5", versus 66.3" with the larger tires.

Once again, this may vary a bit depending on who made you tires, but this should get you close!

• Ag Tires

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