YSS rear gas shock absorber for Yamaha XP 530 T-Max scooter. G-RACING - SEPARATE GAS SHOCK: The maximum expression of YSS technology at the service of expert pilots and motorcyclists. Emulsion monoshock (gas/oil) with spring preload ring, adjustable rebound and compression, and adjustable wheelbase +10mm. Piston diameter 45mm, Rod diameter 16mm, Shock absorber length 315mm.