Product Description Spare bearing kit for Syntace HiTorque MX hubs. Models:front 15 mm 28 hole: Outer Diameter: 26 mmInner Diameter: 17 mmWidth: 5 mmContents: 2 x spare bearings 17 x 26 x 5 mmManufacturer Number: 115385 front 20 mm 32 hole: Outer Diameter: 37 mmInner Diameter: 25 mmWidth: 7 mmContents: 2 x spare bearings 25 x 37 x 7 mmManufacturer Number: 115392 Rear: Outer Diameter: 26 mm / 30 mmInner Diameter: 17 mmWidth: 5 mm / 7 mmContents: 2 x spare bearings 17 x 26 x 5 mm, 2 x spare bearings 17 x 30 x 7 mmManufacturer Number: 115378 Manufacturer: Syntace GmbH Stefan-Flötzl-Straße 6 83342 Tacherting Germany syntace@syntace.de