2 models
Mid-drive motor technology delivers natural, efficient pedaling for riders who want the best of both worlds.
The right bike changes everything
A mid-drive motor sits at the cranks — the most efficient position on a bicycle. It leverages your gears for better hill climbing and more natural power delivery. Surface 604 mid-drives combine this efficiency with our signature 960Wh battery, step-through convenience, and the components that make every Surface 604 a bike shop favorite.
960Wh
Biggest battery in mid-drive segment
Mid-Drive
Motor at the cranks for efficiency
Step-thru
Easy entry for all riders
4.7/5
Highest eBike score at webBikeWorld
The Surface 604 Advantage
Specs don't lie. See how Surface 604 stacks up against the competition.
| Feature | S604 Colt Mid Drive | Aventon Ramblas ADV | Ride1Up Prodigy v2 | Ride1Up TrailRush |
|---|---|---|---|---|
| Battery | 960Wh (48V 20Ah) | ~720Wh | 504Wh (36V 14Ah) | 720Wh (48V 15Ah) |
| Motor | Mid-drive | A100 mid / 100Nm | Brose 90Nm mid | Brose 90Nm mid |
| Top Speed | 28mph PAS | 20mph | 28mph | 28mph |
| Brakes | Tektro Hydraulic | Hydraulic disc | Hydraulic disc | Hydraulic disc |
| Drivetrain | Shimano Alivio 9sp | Electronic shift | Shimano Deore | Shimano Deore |
| Torque Sensor | Integrated | Integrated | Integrated | Integrated |
| Frame | Step-through | Step-through | Step-thru + step-over | Step-over only |
| UL Certified | 2271 + 2849 | 2271 + 2849 | UL 2849 | UL 2849 |
Specifications sourced from manufacturer websites as of 2026. Verify current specs before purchase.
Quality Components
Name-brand components you can trust — and any bike shop can service.
Crank-mounted for natural, efficient power delivery
Leverages gears for superior hill climbing
Consistent stopping power in all conditions
Biggest battery in the mid-drive segment
Easy on, easy off for riders of all abilities
Smooth, natural pedal-assist response
Real Riders
Not marketing copy. Real quotes from verified Surface 604 riders.
Expert Reviews
Every Surface 604 model has been independently reviewed by the industry's top publications.
As Reviewed By
From the Blog
Tips, guides, and stories from the Surface 604 community.
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