The topeak mtx beam rack is designed for use with the topeak mtx or rx rear rack bag range great for touring with a full suspension universal deck design the mtx racks will fit all topeak trunk bags this rear rack is made from a tough 6061 t6 alloy and will carry up to 20lbs making it ideal for the tough world of mountain biking all topeak beam racks use topeak39s patented quicktrack system making it so easy to slide your topeak bag on and off your bike rack it also uses a quick releas