Rivian spinoff e-bike stuns with mind-bending virtual drivetrain

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• How the virtual drivetrain changes riding
• Range, charging, and ride dynamics
  • Key performance numbers
• Modular frame built for city life and errands
• Control, software, and rider experience
• Models, pricing, and who it’s for
• Practical advantages and trade-offs for riders
• Availability and rollout timeline

The newest e-bike from a Rivian offshoot aims to shake up urban riding by removing the mechanical link between your legs and the rear wheel. What looks and feels like a bicycle is, under the skin, controlled by software and electric actuation. That change promises less routine maintenance, seamless gear changes, and a more car-like feel for commuting and errands.

How the virtual drivetrain changes riding

Instead of a chain driving the rear hub, the TM-B uses a system that converts pedaling into electrical energy. A dedicated motor then propels the wheel. This setup is often called pedal-by-wire, and it shifts mechanical complexity into code.

• Power flow: Pedal input → generator → battery → wheel motor.
• No derailleur: Gear ratios are simulated, so there’s nothing to misalign.
• Energy recovery: Regenerative braking feeds charge back to the battery.

The company calls the setup DreamRide. It’s tuned to deliver a peak of 180 Nm of torque, and the system models gear changes so every shift feels smooth and instantaneous.

Range, charging, and ride dynamics

Range depends on battery size and riding style. Riders can expect roughly 60–100 miles per charge. Regenerative braking and the pedal-energy capture help stretch that number.

Key performance numbers

• Torque: 180 Nm peak.
• Range: About 60 to 100 miles, battery-dependent.
• Top speed: 20 mph on throttle, 28 mph with pedal assist.

Suspension and software work together. The TM-B has about 120mm of travel up front. The firmware can also be set to match local e-bike classes, switching among Class 1, 2, or 3 modes as needed.

Modular frame built for city life and errands

One of the TM-B’s standout features is a removable top frame. With a touchscreen tap you can change seating and cargo configurations without tools.

• Single seat for solo commutes.
• Bench option for a passenger.
• Cargo rack that supports groceries or deliveries.

The latch system is electronically controlled from the 5-inch touchscreen. It secures up to 77 pounds of payload and unlocks with a digital command. The design aims to swap roles from commuter to utility bike in seconds.

Control, software, and rider experience

The TM-B leans heavily on software for the rider experience. Pedal input is interpreted and blended with motor output for a smooth feel.

Features include:

• Adaptive torque mapping to mimic gear behavior.
• Regenerative braking profiles you can tweak.
• Class-compliant settings so riders meet local regulations.

Because the physical drivetrain is simplified, routine maintenance like tuning derailleurs and replacing chains is greatly reduced. The trade-off is more reliance on firmware updates and electronic diagnostics.

Models, pricing, and who it’s for

The TM-B arrives in multiple trims aimed at early adopters first. A Launch Edition and a Performance model will be available initially, with a more affordable base version arriving later.

• Launch / Performance Editions: Priced at about $4,500.
• Base model: Planned for later in 2026 at under $4,000.

The price positions the bike against premium competitors rather than budget e-bikes. Buyers weighing the cost will consider the convenience of near-zero drivetrain upkeep and the flexibility of the modular frame.

Practical advantages and trade-offs for riders

For city riders who juggle speed, cargo, and comfort, the TM-B promises a rare mix. You get an electric-assist bike that can act like a small utility vehicle.

• Pros: Low mechanical maintenance, instant gear changes, adaptable payload options.
• Cons: Higher price and increased dependency on software and electronics.

How much the virtual drivetrain adds value depends on the rider. If you dislike chain maintenance and want plug-and-play versatility, the TM-B offers a compelling alternative to traditional e-bikes.

Availability and rollout timeline

The first editions are expected in spring 2026. The main models will launch in phases, with the more affordable variant following later that year. Early buyers will encounter the most feature-rich models first.

Subscription and update plans, warranty details, and service networks will influence ownership cost. The company is targeting urban commuters and small-scale cargo users who value convenience over the lowest sticker price.