[Dave at Pelican Parts]

Standard 914 wheel size: 4.5x15, up through about 72. Very few 914s came with "standard" wheels, though--most were at least upgraded to the optional 5.5s.

After 72 (or whatever the changeover year was; I forget exactly!) the standard wheel was the 5.5x15 steelie. Has about 4 3/4" of "backspace".

All of the factory-supplied four-bolt alloy wheels were 5.5x15. All had about the same amount of backspace as the stock 914 steel wheels; about 4 3/4". (The 914-6, with its five-lug wheels, had the option of using a 5.5x14 wheel instead.)

Tires for the early standard wheels were 155R15, or about 155/80-15. Tires for the 5.5s were 165R15, or about 165/80-15.

--DD