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4 Pack MR18307-2RS / 18307-LBLU Bicycle Hub Bearings – 18 x 30 x 7mm Deep Groove Ball Bearings A practical 4 pack of sealed deep groove ball bearings suitable for compatible bicycle hubs and other applications requiring an 18mm inner diameter, 30mm outer diameter and 7mm width. Bearing Size: 18 x 30 x 7mm Reference Numbers: MR18307-2RS / 18307-LBLU Deep Groove Design – Suitable for smooth rotational movement and radial loads. Sealed Construction – Helps protect the bearing from dirt, dust and moisture. Ideal for Bicycle Hubs – Suitable as replacement bearings for compatible front or rear hub assemblies. 4 Pack – Useful for servicing, repairs and keeping spares available. Package Includes: 4 × 18 x 30 x 7mm Deep Groove Ball Bearings