Couldn't you just fit those upside down/on the other sides?
Exactly ...
They're for converting 20 x 1-1/8” wheel standard (ISO 451) to accept the 20 x 1.5” (ISO 406) standard .. which is similar to the radius difference between 700c and 650b (19mm) ...
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Couldn't you just fit those upside down/on the other sides?