Tire size fitment

Is there an internet resource that could tell me the cars that came with a specific OEM tire size?

You may call it a reverse tires size calculator.

Not that I know of. With cars having multiple optional sizes, that would take some work to put together, with no way of making money from it (selling tires).

Tire Guides publishes a book called “OEM Tire Size Guide” which retails for $35. It is extremely useful for tire retailers (to tell them what tire sizes to have in stock) and tire manufacturers (to tell them what tire sizes to produce), but there doesn’t appear to be any value to the general public.

However, I suspect you are trying to sell a set of tires and want to tell folks what they fit. Advertise your tires by size and have your potential buyers look for the vehicle tire placard, which is usually located on a doorpost or in the glove box. If you have a match (all numbers the same), then you are good to go! If you don’t have a match, the rest is just too complex for the average buyer (and seller) to deal with.

Check out Tire Rack