smooth out those rough roads
Sirius Key Highlights
The little design choices that make this model stand out.
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!
*Upgraded battery! 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 mounting points for a rear rack and an in-frame water bottle cage.
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!
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 490Wh battery provides 20 to 60 miles of range depending on terrain, assist level, and other factors. All of our batteries are removable and can be charged on or off the bike.
Class 1 / Class 3 Controller
MPF 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. Both are included.
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.
Brakes
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!
Tires
27.5" x 2.1" tires with knobby tread to take on some mild off-road riding.
Ride along
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