A Pair (2) of new Aluminum 24″x1″ (540) Wheelchair Wheels with (2) Axles with ROUND HUBS. 24″ = 540 rim is the standard wheelchair size not to be confused with 25″=559 or 26″= 590. The tires are (marathon style) 24″x1″ mounted on colored aluminum 540 rims with colored aluminum spokes.