Buy a set of formula one rims$8.99 and buy a lego kit #4654 Tanker truck$15.00.All you need is the tires out of the lego kit.Take the dremel and grind the lip out of the inside of the tires(lego).Then take the f 1 rims and seperate them.There are 2 different sizes the narrow are fronts and the wides are rear.Take one of the wide rear rims and take your dremel and grind the lip that sticks out on the inside.You need to do this so the rim will clear the diff.Then stretch the tires on to the rims and center them the best you can.The offset on the rims gives you a wider wheel base and a little bit better ground clearance.You will have to do some grinding on your body to get full turning radias or a body lift.The only thing on your chassis you have to trim is the little pegs that stick out on the battery holder in the front.You should have full turning radias.If not small washers will help push the rims out for clearance.Will have pics soon.Trying to get a photo album.If you want to see some email me.
Good luck
Rcrawler