New Wheel part numbers explained.
BW3215-275-093-450
BW32 = 1/32 scale.
15 = 15" diameter in the real world, could be 13, 15, or 18.
-275 = width at the rim Where the tire seats. Typically 200, 275, 380, and 460 widths.
-093 = Axle bore size. 062 = 1/16", 093 = 3/32, 125 = 1/8", 540 =5-40 threaded.
-450 = Inside diameter where the insert sits. 450, and, 375.
If the last number on the wheel part number is -450, you would use an insert that had a BW450-?? part number.
If it ended in -375, you would use a BW375-?? part number for the insert.
The above part number is 1/32 scale, 15" diameter, .275 wide at the rim, 3/32 axle size and, uses .450 diameter inserts. Basically, a replacement for Ninco Classics.
Hope that cleared up some confusion.