Replacement Bearing for front hub or wheel. 5 types available: CE034 - 35 x 10 x 17 (for 17mm front hubs) CU014 - 37 x 7 x 25 (for 25mm front hubs) CU014-9mm - 37 x 9 x 25 (for 25mm front hubs, slightly higher) CU019 - 42 x 9 x 25mm (intrepid/skm "speedline" and most other newer Italkart/Intrepid/Praga front hubs) K221 - 35 x 15 x 11mm ...