The DS Bike Protection R1100GS Transmission Reinforcement bracket is made of 4mm steel and provides critical protection for a high stress area. If heavily laden or ridden fast in rough conditions (or all of the above), the rear frame can exert enough leverage to break the transmission case. If you use your GS off-road the way it was meant to be ridden, this is a critical investment to prevent an expensive repair.
Shown in red only to demonstrate how it mounts, the bracket comes in natural/aluminum.
R1100GS Transmission Reinforcement Bracket - $74.99 -