The BT-Mg-A is a magnesium frame and backrest chair similar in style to the base BT-Mg except the center of gravity is adjustable by up to an inch of forward and rearward travel in half inch increments. The BT-Mg-A cuts down on weight by utilizing high tech laminated carbon fiber sailcloth for seating material, titanium hardware, Spinergy Light Extreme rear wheels, and Frog Legs Uni-tine caster forks. Add it all up, and you have an Impossibly Light™ adjustable center of gravity chair! Transport weight is just 9.8 pounds for a 16" x 16" fame and 16.9 pounds for the entire chair including the rear wheels (not including cushion- cushion weights range from 1 pound and up depending on size and material).

A note on Magnesium: Magnesium is the lightest structural metal on the planet! By volume, magnesium is roughly 35% lighter than aluminum and 62% lighter than titanium, yet has similar strength characteristics as 6061-T6 aluminum. Magnesium is also exceptional at dampening vibrations which gives a smoother ride.