Unequalled Comfort and Reliability Thudbuster has been the bicycle industry standard in suspension seatposts for over 20 years, by providing unequalled comfort and reliability to riders around the world. Cane Creek now announces the latest  design specifically with the rigours of e-bikes and daily commuting in mind, the new Thudbuster ST includes 50mm of travel to significantly diminish shocks and impacts from broken pavement, cobblestones or any other mixed surfaces. Tool-Free specifications . Part Number: SP6A309 . Setback: 0mm (unweighted) . Material: Forged aluminium . Seat Clamp: Single bolt fastening and angle adjustment design . Pivots: Threaded, serviceable, hard anodised aluminium axles flanged, PTFE bushings . Elastomer: Medium firm elastomer pre-installed from the factory. Soft and Firm elastomers included. Extra Soft and Extra Firm elastomers sold separately . Travel: 50mm . Length: 375mm . Weight: 580 grams . Max. Rider Weight: 150kg . Extension: Minimum - 100mm / Maximum - 274 . Diameter: 27.2mm (can be shimmed for larger sizes) (Note these are OEM posts without retail packaging)