E-Helix (Helix e-bike, Bosch SX)
Origin
The E-Helix (officially branded simply 'Helix' from MY2025 onward) is Bergamont's first integration of the Bosch Performance Line SX system — Bosch's lightweight mid-drive launched in 2023 — and signals a generational reset of the brand's trekking platform. The non-electric Helix has been Bergamont's everyday-trekking workhorse since the early 2010s, and the new motorised Helix takes the same 28-inch aluminium trekking frame and weaves a 400 Wh battery into the down-tube while keeping the bike under typical e-trekking weight. The launch range covers two main trims (Helix 10 Belt with Gates CDX belt drive, Helix 20 with conventional derailleur), each available in a diamond Gent frame or a low-step 'Slope' frame aimed at female riders and older commuters. By choosing the SX rather than the heavier Performance Line CX, Bergamont is positioning Helix as a 'first e-bike' — close enough to the feel of a normal bicycle that someone moving from a regular trekking bike into electric assistance does not lose the character of the ride.
Specifications
- Frame
- 28" ultra-lite AL-6061 aluminium tubeset with integrated Bosch CompactTube battery in the down-tube; diamond (Gent) or low-step 'Slope' frame shape
- Weight
- kg
- Drivetrain
- Helix 10 Belt: Shimano Nexus SG-C6001-8 8-speed internal hub + Gates CDC Carbon Drive belt. Helix 20: Shimano CUES 1×10 derailleur (11-48T cassette)
- Brakes
- Shimano BR-MT200 hydraulic disc, 180 mm rotors (Shimano SM-RT10) front and rear
- Wheels
- 28" (622 mm); BGM Pro X15 disc rims with eyelets (Helix 10 Belt)
The verdict
- Natural, near-analogue ride feel — the lightweight Bosch Performance Line SX (~2 kg, 55 Nm) and the 21.8 kg total weight make it behave much like a normal trekking bike, ideal as a first e-bike.
- Very low maintenance on the Helix 10 Belt: Gates CDC carbon belt + Shimano Nexus 8-speed internal hub means no chain oil, no exposed cassette, quiet running.
- Fully kitted for everyday commuting/touring out of the box — integrated lights, rear rack with pannier holder, full mudguards, suspension fork and puncture-protected Schwalbe tyres.
- Inclusive sizing and frame choice: diamond and low-step 'Slope' frames share geometry, so couples or shorter/older riders can get a matched fit.
- Removable, frame-integrated Bosch CompactTube battery and a clean cockpit with the simple Purion 200 display.
- Small 400 Wh battery limits range — fine for daily commuting but short for long tours, and there is no big-battery option (range extender is an extra cost).
- 55 Nm SX motor is deliberately modest; on steep, loaded climbs it gives noticeably less punch than a Performance Line CX e-trekking bike.
- Heavy for its 'lightweight' positioning at 21.8 kg — awkward to lift up stairs or onto a rack despite the light motor.
- Component spec is mid-range value, not premium (Suntour fork, Shimano MT200 brakes, CUES/Nexus) — adequate but unexciting for the ~3,300-3,500 EUR/GBP price.
- Bergamont's confusing naming (sold simply as 'Helix' but is the e-version; multiple trims 10 Belt / 20 / Slope) makes it easy to order the wrong variant.
Who it’s for
Related models
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