Drivechain

You can really use any decent quality drivetrain. Use the set for now and just replace it when worn out. However, if you prefer, then here's some ebike specific groupset recommendations that you can try and save the microshift for another time:

• Box Components Prime 9 Single Shift 
• Shimano LINKGLIDE Utility 
• SRAM Eagle

Why a 9-speed cassette, not a 7-speed cassette?

We chose a 9-speed cassette for its improved performance and modern compatibility. Compared to 7-speed systems, 9-speed chains are typically made from stronger, more durable materials, offering better longevity.

The closer gear spacing also ensures smoother, more precise shifting. Plus, the wider gear range makes it easier to handle various terrains, and replacement parts are more readily available for future maintenance or upgrades.