Rear air shock absorber designed to make your ride smoother, more controlled, and easy to tune for different terrain and rider preferences. Key benefits Tailor ride firmness: The integrated air-pressure adjustment knob lets you quickly change suspension hardness so you can switch between a firmer setup for climbing and a softer setup for rough terrain. Reduced vibration and rider fatigue: Aluminum-alloy construction and effective damping minimize strong impacts on uneven surfaces, improving comfort and control. Fast, straightforward installation: Includes a 24 mm insert to simplify mounting so you can get back on the road with minimal tools and downtime. Fits multiple bikes and riders: Available in four lengths to match frame geometry and riding style. Features and specifications Function: Rear air shock absorber with manual air-pressure adjustment. Adjustment: Knob for changing air pressure/firmness on the fly. Material: Durable aluminum alloy body for strength and corrosion resistance. Sizes: 125 mm, 150 mm, 165 mm, and 190 mm to suit a wide range of bicycle models and rider sizes. Installation: Supplied with a 24 mm insert for easier fitment. Performance Designed to dampen harsh vibrations and impacts on rough roads or trails, improving wheel contact and rider stability. Air-pressure tuning allows you to balance comfort, traction, and pedaling efficiency depending on load and terrain. Typical applications Urban commuting: Smooth out potholes and rough pavement for a more comfortable daily ride. Light trail and gravel rides: Adjust firmness for mixed surfaces to maintain control and reduce arm/back fatigue. Touring with gear: Increase firmness to handle additional load and preserve suspension travel and pedaling efficiency. What to expect A reliable rear shock that lets you customize feel, reduces harsh impacts, and installs quickly. Choose the length that matches your frame and riding needs.