Voltage is the specification that separates a bicycle with a motor from a small motorcycle with pedals. City e-bikes run at 36 or 48 volts. The X-Class runs at 60.
Paired with 35 amp-hours in the Performance Edition, that is over two kilowatt-hours of battery — roughly six times what a European city bike carries, on a machine that ships limited to 20 mph.
What a 60 V, 35 Ah pack actually does
Not top speed. The X-Class is a Class 2 bicycle as delivered, and 750 W is a 750 W motor whatever you feed it.
What the big pack buys is consistency. Voltage sag under load is what makes a cheap e-bike feel strong on a flat road and hopeless on a hill; a 60 V system barely notices the climb that flattens a 48 V one. The range figure of up to 60 miles holds up better in the real world as a result.
60 V, 35 Ah battery in the Performance Edition.
750 W motor; 20 mph Class 2, 28 mph Class 3 where legal.
Up to 60 miles of range.
20 × 4.5 front and 20 × 5.0 rear tyres.
350 lb payload; currently $1,799 against a $2,399 regular price.
More battery than the Kepler, less range than the Kepler. The 20-inch fat tyres are where the difference goes.
How to choose between this and the Kepler
The Kepler has a bigger payload (400 lb versus 350 lb), a longer range (75 versus 60 miles), larger 24-inch wheels and UL certification for the whole bike. The X-Class has the bigger battery, the wider rear tyre and the more aggressive stance.
Put plainly: the Kepler is the better bike on numbers, and the X-Class is the one people want to be seen on. If you are buying for the look and the low-speed grunt, that is a legitimate reason — just do it knowingly.
Who it is for
Riders on rough ground who value torque and stability at low speed over efficiency, and who want a battery large enough that charging becomes a weekly rather than a daily job.
As with every machine in this class, check whether your jurisdiction recognises the Class 3 mode before you unlock it. At 20 mph the X-Class is a bicycle; above that, it may not be.
See it for yourself
