The all new Thudbuster is now able to support riders up to 330lbs and incorporates a tool-free, interchangeable elastomer system to quickly and easily adjust the seat post for a variety of rider weightsDesigned specifically with the rigors of e-bikes and daily commuting in mind, the new Thudbuster ST includes 50mm of travel to significantly diminish shocks and impactsInstalling and adjusting the seat on the new Thudbuster is easier than ever with a single bolt design that secures the seat with a few turns of a standard hex toolMedium firm elastomer pre-installed from the factory - soft and firm elastomers included27.2mm375mmBlkAly0mm580g