Whick one do you have know? Do you have 3 piece wheels where the valve stems comes thru one of the bolt holes? They make a vlave stems that's flat that sits behind the center of the wheel and sits nearly flush with the inside lip.
Scroll half down the page and see what I'm talking about.
http://rockcrawler-mrt.com/BEAD%20BR...0by%20MRW.html