A smooth, comfortable, yet powerful ebike to take on the bumpy gravel roads.


$2,999 $2,599 Sale

Adding bigger tires and bump-taming front suspension to a powerful mid-drive motor and reliable internal gear hub, the Sirius takes our hassle-free philosophy to the trails!

Every Sirius now includes both 20mph "Class 1" and 26mph "Warp Core Upgrade" controllers. 

Size: S/M
Color: Chalk White

Pickup available at 2101 SE 6TH AVE

Usually ready in 5+ days

  • Free shipping within the continental US
  • Free returns within 14 days
Size: S/M
Color: Chalk White

smooth out those rough roads

Sporty on all terrains, Sirius shines on potholed pavement and graveled country roads alike. Our smooth motor-assist system is ready for the rough with handling optimized for unpaved routes while the adjustable fork tames the bumps.


15-40 mi*


650 W


26 mph*


55 lbs

Sirius Key Highlights

The little design choices that make this model stand out.

The Sirius' air sprung fork tames bumps and knobby tires maintain traction when the ride gets rough.
With the Enviolo internal gear hub, just twist the shifter to find your perfect gear. There's no such thing as a "missed shift" with this step-less system that provides a wide gearing range. Unlike derailleur gears, you can shift anytime - while pedaling, coasting, or at a stop.
Stopping duties are handled by powerful hydraulic brakes which self-adjust for consistent power as the pads wear. We specify brakes with mineral oil as it lasts longer between service and is less toxic for our world.
Reviewers love the Sirius

Every component, carefully chosen

No heavy batteries, overpowered motors, or clunky profiles. The Sirius was designed to perfectly balance performance, value, and looks.

Goodbye traditional chains.

  • Lasts 3x longer than a chain!
  • No grease, no grime.
  • Doesn't stretch over time.
  • Whisper quiet and smooth as silk.
  • Maintenance free!

Hello Belts!

The battery is easily detachable from the bike with the twist of a key. Charge the battery from anywhere and leave the bike behind!

The Sirius comes with hydraulic disc brakes with 160mm rotors to ensure maximum stopping confidence on the road.

The Sirius comes fitted with cleverly thought-out mounting points for maximum versatility. Racks, fenders, baskets, boombox? No problem.

Find your perfect fit

We recommend you compare your inseam measurement, taken wearing shoes you are likely to ride in, to the stand-over height of our various models. As long as you've got around 1" of clearance over the top tube you'll likely be good to go! If you're on the cusp between sizes we generally recommend sizing up!

Customer Reviews

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Components & Specs

Full component specifications for our fellow nerds. Find the full component specsheet here.

Enviolo Hub

Way better than derailleur gearing, the Enviolo TK continuously variable transmission hub features a 380% range and never needs adjustment.

MPF 6C Motor

We're fans of the strong and silent type, so we use an MPF mid-drive motor with all-metal gearing in an oil lube bath. It has 350-watt nominal power and 650-watt peak output.

Mid-Motor Battery

Our 375Wh standard battery provides 15 to 40 miles of range depending on terrain, assist level, and other factors. An upgraded 500Wh battery is also available for increased range and power. All of our batteries are removable and can be charged on or off the bike.

Class 1 / Class 3 Controller

Our mid-motor bikes can be configured with a Class 1 (motor assistance up to 20 mph) or a Class 3 (motor assistance up to 26 mph) controller.

Suspension Fork

The Sirius features air-sprung fork with 100mm of tunable travel and a compression/lockout adjuster. 1 1/8" straight steerer and 15 x 100mm thru-axle.


Hydraulic brakes paired with 160mm rotors provide ample stopping power.

Gates Belt Drive

Carbon reinforced belts from Gates® last longer than chains, operate quietly, and don't require greasing. No more unintentional chainring tattoos!


27.5" x 2.1" tires with knobby tread to take on some mild off-road riding.