Prior to 1933,Oldsmobile used,along with the large demountable wooden spoke wheels(the whole rim,tyre & spokes were changed as one assembly)and wire wheels.The '33 Olds was also the first year
that the "spider" type of steel wheel(much like the '36 Chevs used)and prior to that,back further than '33(from 1926 to 1930),they also had available as an optional extra,steel disc wheels,much like the '27/'28/'29 Chevs.
The disc wheels for Olds in '26 were 21",in '27 they were 20",
and in '28/'29/'30 they went to 18" wheels for all U.S. domestic cars.All RHD export models from '27 used 20" wheels,whether they were wooden spoked,wire or disc.
Up to 1927,Olds used the same 6 bolt pattern and PCD as the Chevs did up to 1929.In 1928,Olds went to a 5 bolt pattern,and a larger PCD.
