Use a 1x mtb drivetrain. Shimano mountain bike groupsets are cheap as chips (Merlin have got full SLX for £350 at the moment). As everyone else has said, singlespeed on a cargo bike is not really an option: wrestling a cargo bike up a hill doesn't really work, you just have to sit and twiddle small gears.
Use a 1x mtb drivetrain. Shimano mountain bike groupsets are cheap as chips (Merlin have got full SLX for £350 at the moment). As everyone else has said, singlespeed on a cargo bike is not really an option: wrestling a cargo bike up a hill doesn't really work, you just have to sit and twiddle small gears.