Spring coil suspension seatpost with built-in spring coils and shock absorber rubber absorbs vibrations during cycling, delivering a comfortable riding experience and improved impact management. Travel is 40mm (1.65 inches). Rebound force is adjustable by tightening or loosening the bottom screw. How to adjust and install suspension - Before purchasing, confirm the seatpost diameter. Incorrect diameter cannot be installed. - Available diameters: 27.2 mm, 28.6 mm, 30 mm, 30.4 mm, 30.9 mm, 31.6 mm, 33.9 mm. - If you remove the post from the frame, you can see the diameter of your seatpost. - Adjustable clamping angle: from -5 degrees to +18 degrees. Clamp offset is 14 mm. Seat tube parameters - Material: 6061-T6 alloy aluminum - Diameter: 27.2 mm - Length: 350 mm - Travel: 40 mm - Adjustable preload suspension travel - Offset: 14 mm - Weight: approximately 490 g (1.08 lb) - Damping: coil spring - You can add a seatpost Thim (27.2~28.6/30.0/30.4/30.8/30.9/31.6/33.9) to fit different sizes Compatibility and load capacity - Compatible with most fixed gear bikes, road bikes, mountain bikes, universal bikes, etc. - Support rider weights from 50 kg (110 lb) up to 100 kg (220 lb) - Bottom screw adjustment for rider weight: clockwise to accommodate heavier riders, anticlockwise for lighter riders Use scenarios - Daily commuting on rough urban roads or pavement where suspension reduces fatigue and increases comfort - Upgrading a road or fixed-gear bike to improve ride quality on light trails or bad pavement - Long rides or endurance sessions where sustained saddle comfort and reduced vibration help maintain performance This description preserves the product specifications while presenting clear, benefit-focused information, suitable for an informed purchase decision.