【Built for Larger Riders】- Specially engineered long-force-arm design accommodates riders from 75-145kg (166 -322lbs) 【Specifications】- 345mm length | 145mm stack height | 37mm travel | 30mm offset | approximately 843g weight(27., 2mm) | Crafted from 6061 aluminum alloy Bicycle Seatpost Suspension at April Newton blog 【VisiStiff System】- Visual Stiffness Indicator Window. The combination simplifies customization through intuitive, on-bike adjustment (no disassembly required), enabling riders to quickly dial in their preferred stiffness for a tailored ride SAFORT Suspension Seat Post 27.2/30.9/31.6mm Four link Adjustable Safort Suspension Seatpost | Your Local E-Bike Experts Visual window directly displays stiffness position, eliminating blind adjustments 【Patented 4-Link Suspension】- Unlike traditional suspension seatposts, this unique parallelogram structure achieves perfect pressure balance, delivering a noticeably softer and more comfortable ride through advanced suspension technology 【Before You Buy】- Please measure the diameter of your current seatpost to ensure compatibility., Note:the 31., 8mm size is offered as a conversion kit (includes a 27., 2mm post + a 27., 2 to 31., 8mm shim). Seat Post Suspension SAFORT USS-SP28 For EBike - Shock Absorbing Bike Suspension Seatpost The shim is ultra-lightweight and nearly invisible when installed