Roadster4

ebike– EUR

Origin

The Roadster is Riese & Müller's lightest, slimmest urban e-bike line, conceived as a sporty alternative to bulky utility e-bikes — a sleek frame reminiscent of a classic bicycle while delivering German-engineered Bosch power. The Roadster4 is the fourth generation, updated to the Bosch Smart System with the Performance Line CX motor and connected eBike Flow app, GPS tracking and over-the-air updates.

Specifications

Frame: Aluminium frame, slim sporty design; available in diamond and Mixte (lowered top tube) styles, sizes 51/56/61 cm
Weight: kg
Drivetrain: Touring: Shimano Deore XT, 11-speed derailleur (Shimano CUES 11-50T cassette, 42/48T chainring). Vario: Enviolo 380 continuously variable hub gear with Gates CDX belt drive
Brakes: Magura MT4 hydraulic disc brakes (Magura MT5 option on HS speed models)
Wheels: 28", Mach1 650 rims, Novatec front hub, Novatec Boost or Enviolo rear hub

The verdict

+Strengths

Powerful, responsive Bosch Performance Line CX motor (85 Nm) with the connected Smart System (GPS, eBike Lock/Alarm, OTA updates).
Lightweight, slim and agile for a premium e-bike — easy to handle and weave through city traffic.
High-quality component spec: Shimano Deore XT or Enviolo belt drive, Magura hydraulic discs, Schwalbe Marathon Supreme tires.
Comfort without bulk thanks to suspension fork plus suspension seatpost.
Versatile range: diamond and Mixte frames, derailleur or maintenance-free belt, plus 45 km/h HS speed options.

−Weaknesses

Very high price (from ~$7,100 / £4,349, up to ~$8,400 for HS), premium-tier only.
Vario belt-drive models can require a 3-4 week build/lead time.
Limited color options depending on the frame style chosen.
Still ~23.5-25 kg — light for an e-bike but heavy to carry up stairs compared with a regular bicycle.
Only front suspension; rougher surfaces transmit more than a full-suspension model.