Bearings Caster Bearings Part # #80-CB165 #80-CB167 #80-CB187 #80-CB608 #80-CB967 O.D. 29/32″ 29/32″ 29/32″ 22mm 1-1/8″ I.D. 5/16″ 7/16″ 7/16″ 8mm 7/16″ Bearing Type sealed prec. flanged(Invacare & Theradyne) sealed prec.(Inva 8×2, 8×1-3/4, E&J spoke) sealed prec.(5″ 6″ 7″ 8″) flanged MSRP (4pack) $19.78 $16.26 $14.74 $13.82 $13.30 Rear Wheel Bearings Part # #80-RW130 #80-RW998 O.D. 1-3/8″ 1-1/8″ I.D. 5/8″ 1/2″ Bearing Type sealed prec.,5/16″ thick (Stem, Quickie) sealed prec.(Invacare composite) MSRP (4pack) $19.72 $17.02 Stem Bearings Part # #80-SB168 #80-SB188 O.D. 1-1/16″ 1-1/8″ I.D. 1/2″ 1/2″ Bearing Type flanged (E&J) flanged (Invacare) MSRP (4pack) $17.90 $16.12