THE NEW (2017) SLOT.IT WHEEL CODING SYSTEM
The new code for carries all the relevant information about your slot car tires and wheels starting from the three important dimensions (diameter, width, hub thickness), then adding some further information about the design type.
For example, the old code for slot wheel WH1110-AL is 17.3mm diameter, 8.2mm width, 1.5mm hub: it becomes W17308215A