960 Wh — class-leading battery capacity

31% more capacity than Aventon, 43% more than Lectric. The Samsung 21700 cell pack is rated up to 150 km eco range — one charge covers a full week of daily commuting without ever thinking about plugging in.

Dropout torque sensor — natural pedal feel

Surface 604's dropout torque sensor measures actual pedalling force at the dropout — not cadence-only. Assist ramps up and down proportionally to how hard you push, giving a much more bike-like riding experience than cadence-only systems.

Class 3 — 45 km/h PAS

Assists up to 45 km/h under pedal assist — fast enough to keep up with urban traffic on arterials. Thumb throttle provides up to 32 km/h for rolling starts and slow-traffic gaps without pedalling.

UL 2271 + UL 2849 dual certified

UL 2271 tests the battery pack independently; UL 2849 tests the full electrical system — motor, battery, controller, wiring — as a complete bike. Both certifications are required by many insurers and multi-unit buildings.

Tektro Auriga hydraulic disc brakes

180mm rotors front and rear, post-mount. Hydraulic self-adjusting — consistent stopping power fully loaded without manual pad adjustment. Motor inhibitors cut assist the moment you touch the lever for immediate response.

Commuter-ready from box — rack, lights, kickstand standard

Welded rear rack, Büchel 150-lumen front and rear LED lights, and heavy-duty adjustable kickstand all included. No accessories required to start commuting — assembly takes approximately 20 minutes.