Commuter
Tern Vektron Q9
$2,999
Price
50 Nm
Torque
400 Wh
Battery
48.3 lb
Weight
Tern Vektron Q9 vs Vvolt Centauri II
Two commuter e-bikes at $2,399–$2,999, every published spec lined up. Nothing here is estimated: a figure the manufacturer does not publish is shown as “—”.
Where they differ
- The Centauri II makes 70 Nm more torque.
- The Centauri II assists 8 mph faster.
- The Centauri II costs $600 less.
- The Centauri II carries 90 Wh more battery.
- The Vektron Q9 claims 10 more miles of range.
- The Vektron Q9 is 4.7 lb lighter.
- The Vektron Q9 ships as class 1; the Centauri II ships as class 3.
Every spec, side by side
| Vektron Q9 | Centauri II | |
|---|---|---|
| Headline | ||
| Price | $2,999 | $2,399 |
| Category | Commuter | Commuter |
| Price per Wh | $7.50 per Wh | $4.90 per Wh |
| Model year | 2026 | 2026 |
| Motor | ||
| Torque | 50 Nm | 120 Nm |
| Motor power | — | 350 W |
| Peak power | — | 650 W |
| Drive | Mid-drive | Mid-drive |
| Motor make | Bosch Active Line Plus | Vvolt |
| Drive system | Bosch | — |
| Sensor | — | Torque + cadence |
| Battery & range | ||
| Battery | 400 Wh | 490 Wh |
| Capacity | — | 13.6 Ah |
| Removable battery | Yes | Yes |
| Range (claim) | 70 mi | 60 mi |
| Range as stated | 35-70 miles (400Wh) | Up to 60 miles real-world on pedal assist |
| Est. real range | 25 mi | 31 mi |
| Estimate assumes | 16 Wh per mile | 16 Wh per mile |
| Weight & capacity | ||
| Weight | 48.3 lb | 53 lb |
| Max load | 276 lb | — |
| Rack capacity | 60 lb | — |
| Class & speed | ||
| Ships as | Class 1: pedal assist to 20 mph, no throttle | Class 3: pedal assist to 28 mph |
| Unlocks to | Class 1 | Class 3 |
| Class | Class 1 | Class 3 |
| Throttle | No | No |
| Top assisted speed | 20 mph | 28 mph |
| Build | ||
| Gears | 9-speed | — |
| Drivetrain | Shimano Alivio 1x9 (11-32T) | Gates carbon belt |
| Brakes | Hydraulic disc | Hydraulic disc |
| Front rotor | — | 180 mm |
| Rear rotor | — | 180 mm |
| Suspension | Rigid | Rigid |
| Fork travel | Rigid | Rigid |
| Rear travel | None | None |
| Front suspension | No | No |
| Suspension seatpost | — | No |
| Tires | 20 in Schwalbe Big Apple (55-406), puncture protection, Reflex | — |
| Display | Bosch Purion | — |
| Frame | 7005 aluminium | — |
| Sizes | One size | S/M, M/L, L/XL |
| Included | ||
| Lights | Yes | Yes |
| Fenders | Yes | — |
| Rack | Yes | — |
| Kickstand | Yes | — |
| Safety | UL 2849 | UL 2849* |
| Safety certification | UL 2849: full system | UL 2849: most models, confirm this one |
| As the maker states it | Tern ebikes use e-bike systems that are certified to UL 2849 | The Alpha II is tested and certified to the rigorous UL-2849 standard |
Specs transcribed from www.ternbicycles.com on 09/30/2026 and vvolt.com on 09/20/2026. Manufacturers revise specs without notice: confirm before buying.