Ahem...
Gots my 15 x 5 Rally IIs (thanks bman).
Gots my M/T ET Drag slicks & Naturalle Rubber tubes & screws (Thanks P-Dude).
Gots an unsprung weight penalty of 12lbs (or 96 Lb sprung weight load ballast penalty of +.01s ET) if I use them tubes
Seems to me, them tubes are WORTH the +.01 ET penalty...moreso then my significantly heavier fat-front Street tires at 40Lbs unsprung (or 320Lbs load ballast penalty of +.04 ET.) and I'm gonna use them Front Street tires.
Gots my answer. HIS

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Ooops, that would be 15" x 7" on 5" pattern Rallys IIs, factory designed for...
Half-Inch Studs