They're close enough to run a tube-type 20" and a tubeless 22.5" on the same hub. The trucking company where I used to manage the shop did it routinely. Tires have to be pretty compatible so far as profile goes, but the -.5 wheels were intended to be a direct replacement for tube type wheels. For instance, 15" tube type and 16.5" tubeless are supposed to interchange. 16 and 17.5, 20 and 22.5, and 22 and 24.5 are all supposedly direct-swap replacements.
Jerry


"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!