Trail Tune is a very versatile and aggressive tune that is sporty and supportive, designed to go fast over a wide variety of terrain. RIDER WEIGHT SPECS: Sirris offers six weight ranges to choose from when selecting your Trail Tune R46 shock. (Listed weight ranges are rider weight without riding gear on. 15 pounds of riding gear is calculated into the weight ranges) 130 lbs - 160 lbs (Light ships with 75 N/mm spring)160 lbs - 210 lbs (Medium ships with 85 N/mm spring)210 lbs - 230 lbs (Heavy ships with 90 N/mm spring)230 lbs - 250 lbs (X Heavy ships with 95 N/mm spring)250 lbs - 280 lbs (XX Heavy ships with 105 N/mm spring)280 lbs - 350 lbs (XXX Heavy ships with 115 N/mm spring) PRODUCT SPECS: ArchitecturePiggyback, steel spring Stroke85 mm Length320 mm Weight3.9 lbs / 1.76 kg without spring Piston High flow Ø46 mm, CNC 6061 billet aluminum, type 3 hard anodized coating Piston bandHard band Shaft Ø16 mm OD chrome-plated, induction hardened steel, hollow, Ø 5.5 mm ID Shock bodySeamless 6061 aluminum, type 3 hard anodized coating, ACME thread Spring retainerSeamless 6061 aluminum, type 3 hard anodized coating, ACME thread, with locking feature, manual adjust Bottom outMCU bumper Top outRubber bumper DampingTunable compression and rebound ReservoirPressurized with floating piston AdjustersExternal compression and rebound adjustment SealsNBR