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		BrownDogRider - is this tyre calculator any good for your calculations?
 
Tire Size Calculator - tire & wheel plus sizing
 
You just put in the profile and rim size etc and it gives you stats like this:
 
Stock Tire - 235/85R16 >Search Tires 
Section Width:9.25 in/235 mm
Rim Diameter:16 in/406.4 mm
Rim Width Range:6 - 7 in
Overall Diameter:31.72 in/805.68 mm
Sidewall Height:7.86 in/199.64 mm
Radius:15.86 in/402.84 mm
Circumference:99.65 in/2531.1 mm
Revs per Mile:655.7
	 
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		Spudboy,
 
Geez, this is perfect - thanks mate.
	 
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		After all my calcing and than checking out Spudboy's Tyre sizing calculator, I think I'll take Vlads original advice and go for the 255/85r16s. Vlad, you are dead right about the speedo reading being right after fitting this tyre. 
 
I now understand how he can post without a internet connection, etc etc, reel off tyre sizes at random regardless of make and model etc etc etc etc etc etc etc - he mascarades as "The Vlad" but really he is  "The Magical Vlad", who possess wisdom and instantainous magical knowledge of all things Land Rover.
 
And I shall refer to you from this point on, and encourage all to refer to him as "Lord Magical Vlad".
 
Well - until he stuffs up anyway.