X-Trainer Rear Shock Absorber '15-'23NEW Beta Factory Monoshock absorber for all XTrainer owners who want to improve the ride ability and comfort of their bike. The Monoshock, developed by Betamotor technicians, offers the most demanding riders better support, consistent performance and progressive response, thanks to the greater volume of oil and air it contains, and matched with 5. 2K rear spring as standard. It also gives the possibility for the first time on the XTrainer, high and