The Thudbuster LT G4 by Cane Creek is an all-new suspension seatpost designed with your comfort in mind. Its unique Parallel Linkage technology smooths out those bounces and bumps that can wear you down. Its user-friendly and durable design will have you enjoying comfortably smooth rides on every adventure. Max Rider Weight: 250lbs / 113kg Seatpost Travel: 90mm / 3.54in Necessary Exposed Seatpost: 144mm from the saddle rails to the bicycle frame Seat Clamp: Single bolt fastening and angle adjustment design Setback: 5mm (unweighted) Two diameters, by compatibility : 27.2mm diameter: Compatible with 2020 Aveny, Vika+, and Sol. Also compatible with Aveny Skyline, Vika+ Flex, Sol Eclipse, and Packa Genie. Extension – 146mm to 290mm Length – 390mm 31.6mm diameter: Compatible with 2020 Packa Only. Extension – 146mm to 320mm Length – 420mm