The brompton s2l 2017 folding bike features bromptons s type handlebar the s type is bromptons sleekest and most aero handlebar a 2 speed bsr hub the brompton standard range hub is an updated version of the original sturmey archer hubs used on their first bikes bromptons are as simple and user friendly as they come using their patented folding mechanism no folding bike can fold as fast and as compact as a brompton can