In the unlikely event of a drive unit malfunction, your Shuttle is still absolutely ride-worthy. We designed the Shuttle to be a great mountain bike—even with the pedal assist disengaged. Thanks to the DW Link design, the bike pedals efficiently. It’s a bit like riding a cross between a Mach 5.5 and a Firebird. True, the Shuttle weighs more than its non-motorized siblings, and you’ll feel that with the drive unit turned off (there’s no getting around physics), but it’s still fun to ride with the drive unit turned off.