Shimano tiagra rs400 front hub the shimano tiagra rs400 front hub is an extremely durable and reliable compatible front hub for road cyclists seals help to prevent water and dirt ingress for incredible performance in all weather conditions features like those at the top of the range rs400 tiagra level 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 the hub uses an