After struggling with a troublesome front derailleur on his Airnimal Chameleon folding bike, Bruce Metras of B. Metras Company (San Rafael, CA) upgraded his bike with the installation of a Schlumpf Speed Drive.The Schlumpf system simplifies the drive train by using a single chain ring in the front that is connected to a two-speed internal gear system encased in the bottom bracket.
Blog - Tag: Commuting
When Schlumpf redesigned their clutch plates to make them compatible with fixed gear bikes, Neil wanted a unique frame to test/showcase a Speed Drive unit. The Brooklyn Machine Works Gansta Track frame fit the bill with its pierced top tube, box-section fork crown, and airfoil fork legs, seat stays, and chain stays. Only problem - the frame had no provision for a brake.