 In mountain biking the term 'suspension hub' was used in the 90s to describe hubs with oversized axle ends and a thicker axles than were customary at the time.These hubs were designed to stiffen up suspension forks, which were still somewhat of a novelty, by rigidly holding the fork legs in position relative to each other once the wheel was fitted, improving steering response in the fork.This term is no longer used as this function is no longer an exceptional requirement for mountain bike front hubs, so all current mountain bike hubs are suspension hubs.