[seanp2k2]

They say a few minutes, but with a lockring tool and a chain with a masterlink, I bet someone with a bit of experience could change a cassette in under 2 minutes as well. The rest of the mechanism seems a lot less durable and a lot less amenable to off-road riding where one might wish to pedal backward up to a full revolution to reposition their feet without wishing to propel the bike forward. It might be OK for casual / commuter bikes, but belt drives already exist and last a long time. The width of the rear axle required for the dual-sided drive also looks super goofy and probably gives a poor Q factor ( https://www.cyclingnews.com/features/what-is-q-factor-and-do... ). Overall these seem like a lot of compromises for little benefit beyond a chain or belt. Chain-driven bicycles are also incredibly robust and proven to work amazingly well in a very wide range of conditions, and are serviceable worldwide.