Yamaha learned the Mono-Shock RA rear suspension was sprung too light for the type of riding the RTX models were being subjected to, so they installed the torsion-spring rear suspension (from the Nytro) into the RTX and wow, what an improvement! For aggressive riding styles and conditions, weâ€™re now more favorable to the range of adjustability and the ability to pre-load off of bumps and such, it is simply a better match for the rest of the sled and the riding style it is intended for. It also gets a low windshield and hand deflectors. Curiously, it also gets the black and yellow â€œlookâ€ of the 2006 Nytro. This is still the lightest Apex you can get, and the most capable one suspension wise. Nice improvement.