 Some bikes (such as the Cannondale Scapel, Yeti ASR Carbon and older Yeti bikes) use a four-bar suspension design where one of the pivots is replaced by a flexing link.The unified rear triangle or "URT" for short, keeps the bottom bracket and rear axle directly connected at all times.Suspension action is provided between the rear triangle, which unites rear axle and bottom bracket, and the front triangle, which unites seat and front axle.