2pcs/lot 6903/18 18307-2RS 18307 6903 RS MR18307-2RS No standard bike bicycle bearing 18x30x7 18*30*7
Inner ring,outer ring and ball all made of chrome steel (GCR15)
Rubber seal ( two type, one side black one side orange, double side blue, radom)
Size: Inner diameter 18mm
Outer diameter 30mm
Weight : 16.4g
Suitable for: A2Z brand XTR after the hub, XXF hub, Qing Hao (CH Disc / HH series) hub, Halo Mercury Rear Hub Halo Hubbub after a number of brands such as bicycle hubs.