This item is intended solely as an upgrade to pre-ordered VELLO bikes. Your pre-ordered VELLO bike will be shipped to you after the upgrade with the Schlumpf Speed Drive already installed. For the new order of a VELLO Bike + with Schlumpf Speed Drive, please select this option directly in the product configuration under "gear shift".
The Schlumpf Speed Drive is an ultra-flat 2-speed planetary gear with a ratio of 1: 1 and 1: 1.65, which is mounted to the bottom bracket. With this optional equipment you can drive the VELLO Bike + mechanically over 25km / h with a comfortable cadence.