sidewall bulge measurement ?

Looked these up. Ought to give you a pretty good idea:

Mickey Thompson 325/50-15: Section width 13.10", Rim -no recommendation given
Hoosier 325/50R15: Section width 13.00", Rim 9" to 11", Measuring rim is 10.00"
M&H Racemaster 325/50R15: Section width 12.30", Rim 10" to 12"
Nitto NT555R 325/50R15: Section width not specified, Rim 9" to 11.5"
BF Goodrich 325/50R15: Section width 13.23", Rim 9" to 12"