710/70R42 wheel/tire dimmensions
tire  overall diameter - 2065mm
tire  overall width    - 710mm
wheel overall diameter - 1182mm

LEGO solution
tire  overall diameter - 123mm
tire  overall width    - 50mm
wheel overall diameter - 72mm

In order to achieve 123mm overall diameter from Powerpuller tire,
you need to make part containing  
 - two "Fabuland Plate, Round 13 2/3 Stud Diameter - (Ferris Wheel Side, 
   Merry-Go-Round Type 2 Base) " and 
 - one gear 40 tooth between them

and put them togeather inside Power puller tire and cover it with 
container block 9 x 9 x 1. to become propper shape of tire you have 
to massage it for few minutes


Parts list:
1 x http://www.bricklink.com/catalogItem.asp?P=32298
2 x http://www.bricklink.com/catalogItem.asp?P=4750
1 x http://www.bricklink.com/catalogItem.asp?P=3649
2 x http://www.bricklink.com/catalogItem.asp?P=47676


for any commants, questions please contact me at
ipsaDOTigorATgmailDOTcom