This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
輐 combines 車 (vehicle) with 完, which likely contributes the sound. The exact historical development is uncertain.
A vehicle 車 with a complete 完 shape might suggest a fully rounded wheel, but the meaning is unclear.
For カン, imagine a can rolling under a car: can -> カン, and the car 車 is complete 完.