Aftermarket aluminum wheels tend to be more or less standardized, so finding tires to fit them is much easier. The sort of plastic wheels that come on most 1/32nd cars are more of a problem because they are usually not standardize even for the same make. In the last couple of years or so at least a couple of makers, Pioneer and Scalextric, have moved to standardized wheels. Most aftermarket tire makers now use CNC machined molds to make their tires and those are expensive. Because most wheels have a center ridge the molds need to have two parts that register perfectly. The maker would have to sell a considerable number of tires just to cover the cost of a mold, so the maker needs to make a guess as to the popularity of a particular car to avoid being stuck with useless molds.
The individual tire makers usually have tables that show what tires match the various wheels. A more sophisticated approach was taken by Slot Car Corner for the Quickslicks silicone and Paul Gage urethane tires. There are interactive guides on the site for both makes so you do not have to scan an entire large table to find what you want.
Ten years ago some kind person made an Excel spreadsheet available that listed tires for many cars. Rubber, silicone and urethane tires were included. I am not aware if an updated version of the spreadsheet is available, but if someone wanted a copy of the old one they could drop me a PM with their e-mail address.
