When did Chevrolet switch from wood spoke wheels to steel disk wheels?

I saw a 27 sedan and a 27 Pick-up one had wood wheels the other steel, respectively. Witch one was original or were they both original

Wooden Spoke Wheels

Steel wheels were not available on the pickups until 1929. The cars had the options of steel disc or wood spoke wheels in the mid '20's. I'm pretty sure that '27 was the last year the wood wheels were available on passenger cars.