SN-4821-MKIV · 2025.03

MK-IV

The stubborn electric bicycle. Aluminum frame, 250W mid-drive, 120 km range. Built to be ridden, not admired.

0 km Range
0 kg Weight
0 W Motor
0 Wh Battery
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Wide-angle photograph of a minimalist electric bicycle with raw brushed aluminum frame leaning against a textured concrete wall in overcast urban light, low angle showing mid-drive motor and clean internal cable routing, muted warm gray and putty palette, 35mm lens, soft diffused daylight.

DOC·2025·SPEC-A

SPECIFICATION

Every number earned. Nothing decorative.

Model
MK-IV
Frame
AL-6061-T6
Weight
17.2 kg
Max range
120 km
Motor
250 W mid-drive
Torque
60 Nm
Battery
504 Wh / 36V 14Ah
Charge time
3.5 h
Assist
Eco · Tour · Sport
Max assist
25 km/h
Brakes
Shimano MT200 hydraulic
Tires
Schwalbe Marathon 700×42c
Gears
Alfine 8-speed IGH
Wheels
650B (27.5")
Display
LED panel, 3-mode

AL-6061 · WELD-EXPOSED

THE FRAME

6061-T6 aluminum, hydroformed and TIG-welded. The weld beads are left visible — not because we couldn't grind them smooth, but because a joint you can see is a joint you can trust. Internal cable routing keeps the lines clean. The battery integrates into the down tube; you'd never know it was there.

Geometry tuned for upright comfort on commutes, stable enough for loaded touring. Flat-mount disc brakes, thru-axles front and rear. Fender and rack mounts at every opportunity. The frame is the document — everything else bolts to it.

Close-up detail photograph of a bicycle frame joint showing visible TIG weld beads on brushed aluminum tubing, the weld pattern clearly visible as a rhythmic ripple of aluminum, warm diffused studio lighting, macro lens, muted warm gray palette.

BFR-504 · 250W-MID

THE DRIVETRAIN

Detailed photograph of a mid-drive electric motor mounted in a bicycle bottom bracket shell, showing the brushed aluminum motor housing bolted to the frame, chain engaging the drive sprocket, warm studio lighting, technical product photography, muted warm palette.

250W mid-drive

A mid-drive motor rides with the gears — efficient at every speed, natural under load. 60 Nm of torque for the steep bridge, the loaded basket, the headwind that won't quit. Three assist modes: Eco conserves, Tour sustains, Sport delivers. Quiet enough that you'll hear the chain, not the whine.

Photograph of an electric bicycle down tube with integrated battery showing the seamless aluminum enclosure and side-mounted charge port cover in open position, minimal design language, warm natural lighting, muted warm gray palette, product photography.

504 Wh integrated

36 volts, 14 amp-hours, Samsung cells. The battery lives inside the down tube — remove it with a key turn for charging at your desk. 3.5 hours from flat to full. 120 km in Eco, 70 in Tour, 45 in Sport. The range number is conservative. We'd rather you arrive with charge left.

READY·Q2·2025

Build it the way
you'd build it.

Three frame sizes. Five colors. Fenders, rack, lights, kickstand — add what you need, leave what you don't. Every MK-IV ships ready to ride.

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Starting at €2,490 incl. VAT