For over 20 years, Thudbuster has been the industry standard in suspension seatposts by providing unequaled comfort and reliability to riders around the world. The Thudbuster G4 is superior to its predecessor in every way. Building on Thudbuster’s proven parallel linkage technology we have completely re-designed the seatpost for increased durability, a higher rider weight limit, additional suspension travel, a singlebolt seat clamp design as well as ease of use through tool-free elastomer change.By improving on this already legendary design, we’re confident to say that the Thudbuster G4 is the most advanced suspension seatpost ever made.Key Features:Travel: 50mm (1.97\"),Seatclamp: Single bolt fastening and angle adjustment design,Elastomer: 2-piece design, tool-free inner elastomer change for various rider weight,Pivots: Threaded, serviceable, hard anodized aluminum axles flanged PTFE bushings,Rider Weight Limit: 150kg/330lb,Sizes: 27.2mm, 30.9mm, 31.6mm (additional diameters available with shim),Length: Minimum 100mm, Maximum 274mm,Weight: 580g (31.6mm) .