Shimano slx hub front m678slx front hubs are designed specifically for mountain biking proven angular bearing assemblies are easy to service and can be perfectly adjusted to run smoothly without freeplay the 15mm hb m678 is the perfect compliment to todays thru axle forks maximizing steering and control features durable construction for a longer maintenance cycle angular contact cup and cone bearing with grease sleeve ensures smooth running even in muddy conditions excellent stiffness to w