Shimano sora rs300 rear hubthe shimano sora rs300 rear hub is incredible value for money and is compatible with 8 and 9 speed gear sets seals help to prevent water and dirt ingress for incredible performance in all weather conditions features like those at the top of the range sora road hubs feature labyrinth and contact seals to prevent the ingress of corrosion causing dirt and water internal grease sleeve increases durability and reduces service intervals 8 and 9 speed compatible the hub us