LBP 15" x 10" Wheels - Need a little TLC

Bulldozer said
I've had a few of those and I'm 99% confident both pair are 3 1/2

Thanks , I have a pair of 3'' , and a pair of 4'' , 3 1/2 would be perfect /the reason I asked -----if measures fron the tire bead instead of the outside of the rim---------bob