skateboard inflatable wheel hub (rim) 

Inner Diameter: 91mm

the Hub for standard hota 6inch wheel, only fit 58T pulley

the hub for 7inch wheel, fit 60T or 66T pulley

both hubs could work with 6inch or 7inch wheel, but the hubs need to combine with the correct pulley.

For the Hota 6inch hub, comes bearings 628 (since 2025/5/23) 

For 7inch hub, comes bearings 608