Originally Posted by
fietsbob
6 speed Bromptons , now have a 2 speed derailleur/aKA Chain pusher.
They just do it differently.
2 pulleys with guide flanges molded in, move sideways. the shifter moves the pulley.
3 by 2 hubs have 2 sprockets on 2 different sourced hubs.
TW Sturmey now, Shimano bmx spline.
Previous Sachs /Sram uses 2 3/32 sturmey AW3 spline cogs
the 13 & 15 t cogs work to half step the 3 hub ratios, for the 6 gears.
I know...but it's not a standard derailleur and that's just the point I was trying to make: That no matter what kind of drivetrain you prefer the Brompton only offers a crippled version which exhibits many of the worst qualities of both types.
Last edited by chucky; 01-24-11 at 08:31 PM.