NOS New/Unused Vintage Miyata Unicycle Bearings, made by IKS in Japan. 80s stock. 6203Z hub / fork unicycle bearings. Metal seals. 40mm OD, 17mm ID, 12mm thickness. NOS, smooth and perfect. Correct bearings for your Miyata unicycle. Listing is for 2 bearings. Buyer to pay $6.00 USPS Ground Advantage shipping with tracking. Thanks for looking!