7.25 drum to drum measurement

yup, I bolted some pieces of wood with the lugs to the drum and stretched the tape across it and subtracted the thickness of the wood.

and I suppose in all honesty, the tires weren't perfectly centered. the measurement from the tire to the inner lip of the quarter on the drivers side was 1.875", and from the tire to the inner wheelwell, 2.125". the passenger side the measurements were reversed (it appears the axle is shifted about 1/8" towards the drivers side).