I have 6 used demountable rims. 2 are split 4 are not. The 4 were not a set, they were purchased at different times. In all 6 cases, the hole in the lug that is closest to the inner tube stem is wobbled out and elongated. WHY !!! Is this common or a coincidence ?
Tom, the 'wobbled out' lug is a necessary factory application. When fitting the rim/tyre assembly, the valve stem is dropped through the felloe first. To get the nearest lug over the wheel bolt the whole assembly has to be screwed around a bit, and the elongation in the lug hole allows this to be done. I had a friend who 'repaired' the 'worn' lug holes, only to have to file them out again.
On Chevs, the closer proximity of the valve stem to the nearest lug meant that their lug had to be slotted to allow the rim to be lowered over the bolt. This makes identifying Chev rims easy to us Ford guys.
hope this helps.
Allan from down under.
Tom, what Allan said. To add to what Allan said, those rims and wheels are Hayes. Also, the Chevy style that he referred to, have the valve stem hole in a different location. They can still be used on the T wheels, but the valve stem hole has to be relocated. That being said, this information is for the 30 x 3 1/2 rims/wheels. I don't know for sure about the 21" wheels/rims, but I think the same information applies. Dave