Description • More comfort & less fatigue - the ShockStop City Seatpost smooths out your ride and reduces fatigue from bumps and vibrations with superior shock absorption. • Better performance & complete control - customize your suspension seatpost feel to float over obstacles and maintain traction and control. • Ride faster & farther - energy that is normally wasted suspending your body over bumps, cracks and potholes is converted into forward motion. Features • 35mm of active suspension travel optimized for e-bikes, commuting, city riding, and recreation • Optimized linkage geometry provides ultra-responsive suspension feel • Infinitely adjustable stiffness via pre-load adjustment and swappable springs • Adjusting stiffness / pre-load does not reduce travel • Swappable springs included to accommodate heavier riders and/or ride preference • Check technical specifications for sizes & compatibility What's in the Box: • 1 x ShockStop City Suspension Seatpost • 2 x springs (1 pre-installed, 1 included in box for increased stiffness) • All required hardware What is a Suspension Seatpost? A suspension seatpost is a specially designed bicycle seatpost featuring shock absorbing construction that helps smooth out bumps in the terrain to reduce the impact to the rider. The ShockStop lineup of suspension seatposts feature a proprietary parallelogram design, which allows for the suspension to remain active even when you're seated and pedaling. This means that you can benefit from the suspension's smoothing effect even when you're putting down power, unlike some suspension seatposts that become rigid when you're pedaling. Check out a comparison of our entire lineup of seatposts here. Benefits of a Suspension Seatpost Improved comfort: Suspension seatposts help to absorb shocks and vibrations from rough roads, reducing stress and fatigue on your body, especially your hands, arms, and back. This can lead to a more comfortable ride and reduced risk of injury. Improved control: By absorbing shock and vibrations, a suspension seatpost can help to maintain traction and stability on rough roads, allowing you to ride with more confidence and control. Reduced fatigue: By allowing you to stay seated & pedaling more often on rough terrain, a suspension seatpost can help you to conserve energy and ride for longer without feeling as tired. Better performance: By allowing you to maintain traction and control on rough roads, a suspension seatpost can help you to ride faster and more efficiently. Technical Specifications Diameter and Lengths Available 30.9mm x 350mm, 30.9mm x 400mm 31.6mm x 350mm, 31.6mm x 400mm Diameter 30.9mm, 31.6mm Length 350 mm (14 in) 400mm (15.7in) Suspension Travel 35 mm (1.4 in) Rearward Offset 7 mm (0.27 in) Rearward Offset (@ 25% travel) 12 mm (0.47 in) Spring Pre-load User Adjustable Weight 350mm – 612 - 652g - w/main spring 400mm – 635 - 680g - w/main spring Rider Weight Limit 139kg (308lb) Material 6061 T6 Aluminum Alloy Saddle Rail Compatibility 7mm round Intended Use ASTM F2043 Class 2 - For on and off-road riding and drops less than 15cm (6").