Biktrix Stunner Step-Over Auto Review: A Commuter That Shifts Itself for $2,349
Biktrix's automatic hub means you never touch a shifter, and a 120 Nm Bafang mid-drive means grades stop mattering — for $2,349, that's a genuinely low-effort daily ride.
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What the stars are rated against
The stars compare this bike with other commuter e-bikes we have scored — 32 of them, priced $1,644–$3,054. They are a ranking inside that group, not an absolute grade: four stars means it beats most of that set on the measure, not that it hits some fixed standard.
Peers are drawn from a tight price band around this bike, so a $1,000 commuter is judged against other $1,000 commuters rather than against machines costing three times as much. Change the group and the stars would change with it.
The headline Genius Score is not decided by that group alone. It blends the category ranking above with a market-wide view across every bike we publish, so a bike cannot climb simply by sitting in a weak category. How we score.
Most commuter e-bikes ask you to manage gears, downshift before every hill, and think about the drivetrain more than you'd like. The Biktrix Stunner Step-Over Auto is the company's answer to that. The 'Auto' in the name is a Lofandi 3-speed automatic hub that shifts on its own, so you just pedal and the bike sorts out the gear at every light and every climb.
Under you is a 750W Bafang with , which is a lot of muscle for a commuter and means steep hills basically stop being a factor. It's a bike, so there's a and you can cruise up to 20 mph without pedaling at all. The is rated for up to 55 miles, enough for a normal week of commuting between charges. The Genius Score lands at 74 out of 100, held back mostly by the premium price and the heft.
Pros & cons
What we like
- The Lofandi automatic hub shifts for you, so there's no downshifting before a climb and no fumbling with gears at a red light.
- A Bafang puts out , enough low-end grunt to keep a loaded bike climbing where lighter commuters bog down.
- The is good for up to 55 miles, with a 1200Wh upgrade advertised at up to 85 if you want more range.
- A lets you pull away from stops or crest a short hill without pedaling.
- and a 330-pound payload rating give you room for a full-size rider plus a load of cargo.
Worth weighing
- At about 76 pounds it's heavy for a commuter, so hoisting it onto a car rack or up a staircase takes some effort.
- You're paying a premium, and a few rivals match its range and power for less if you don't mind shifting your own gears.
Key specs
The motor & power
Power comes from a 750W Bafang BBS02 motor, and it's the right kind for a hilly commute. With on tap, it'll haul you and a loaded rack up grades that would stall a lot of commuter bikes.
On paper it's a 750W motor, but Biktrix limits output to 500W and 20 mph, and the isn't published. Don't read that cap as weak, since torque is what pulls you up a hill, not headline wattage.
The covers the lazy moments, like pulling away from a red light or getting up a short, steep pitch without pedaling. Riding on the throttle heavily draws the battery down faster than pedaling, so your range depends a lot on how much you use it.
Range & battery
The standard is a big one, and Biktrix gives it a of up to 55 miles. That number assumes easy conditions, so on hilly routes, in the cold, or with a lot of throttle riding, plan on landing somewhere under it.
For most people that's still a full week of commuting between charges. If you want more of a cushion, there's a larger 1200Wh pack advertised at up to 85 miles.
You may spot a few battery numbers floating around Biktrix's page. The 520Wh figure is just an example in their how-to-read-watt-hours explainer, not a battery you can buy. The bike ships with the 960Wh pack (up to 55 miles), and the 1200Wh option is the one advertised at up to 85.
Ride & components
The Lofandi 3-speed automatic hub is the real draw. It reads how hard you're pedaling and picks the gear itself, so shifting simply isn't something you do anymore. In stop-and-go traffic that's a genuine quality-of-life upgrade, because you're always in the right gear when the light turns green.
The trade-off is gear range. Three speeds handle normal commuting fine, but if you like to sprint on flat, open stretches, you'll run out of gearing sooner than you would on a wider setup.
with 180mm rotors haul it down with good control, which matters on a heavier bike carrying a load. Payload tops out at 330 pounds, so it has room for a bigger rider plus loaded panniers without straining the frame. The 26x2.3-inch tires split the difference between skinny road rubber and full fat tires, a practical width for mixed city and light-path riding.
Price & value
At $2,349, this is priced squarely as a premium commuter, and you're paying for two things you don't usually get at this level: a torquey and automatic shifting. Our Value read comes out fair rather than outstanding, because a few rivals will match the range and power for less if you're willing to shift your own gears.
What the money buys is convenience and climbing power. If a hands-off ride that handles steep climbs is worth paying up for, the price makes sense. If you're shopping strictly on specs per dollar, you can do better elsewhere.
One thing worth knowing going in: like most Class 2 commuters, it's capped at 20 mph on both the throttle and pedal assist, so it's tuned for relaxed city riding rather than fast highway-shoulder runs.
Who it's for
The set-it-and-forget-it commuter
If you want to hop on and just ride without thinking about gears, this is an easy pick. The automatic hub handles the shifting and the mid-drive handles the hills, so your whole job is pedaling and steering.
The hill-country rider
If your daily route has real climbs, the motor sends power through the chain for stronger pulling, and you get a choice: grind up under pedal power or thumb the and let the motor carry you.
The spec-per-dollar shopper
If you buy by comparing numbers side by side, you can find similar range and motor power for less money. What you'd give up is the automatic shifting, so it comes down to whether hands-off gearing is worth the extra spend to you.
The open-road speed seeker
If you've got long, open stretches and want to cruise fast, the 20 mph cap on both throttle and will hold you back. This bike is built for relaxed city riding, not quick point-to-point runs at speed.
Frequently asked
Does the Biktrix Stunner Step-Over Auto have a throttle?
Yes. It's a e-bike with a , so you can ride up to 20 mph without pedaling at all. Heavy throttle use does draw down the 960Wh battery quicker, so your range will depend on how much you rely on it.
How does the automatic transmission on the Biktrix Stunner Step-Over Auto work?
It uses a Lofandi 3-speed automatic hub that senses your pedaling and picks the gear for you, so you never touch a shifter. It's built for stop-and-go city riding where you want to be in the right gear the moment the light turns green.
How far does the Biktrix Stunner Step-Over Auto go on a charge?
The standard 960Wh battery is rated for up to 55 miles, and a larger 1200Wh pack is advertised at up to 85. Count on real-world numbers coming in under the claim on hilly routes or with heavy throttle use.
How fast does the Biktrix Stunner Step-Over Auto go?
It's capped at 20 mph, both on the throttle and under . It's tuned for comfortable city riding rather than fast open-road commuting.
What class is the Biktrix Stunner Step-Over Auto?
It's a Class 2 e-bike, which means it has a throttle and tops out at 20 mph. That generally lets you ride bike lanes and most shared paths, but always check your local rules.
How much does the Biktrix Stunner Step-Over Auto weigh?
About 76 pounds with the battery installed. If you'll be carrying it upstairs or lifting it onto a rack often, that's worth factoring in before you buy.
How it compares to its siblings
The Step-Over Auto is the standout of this family: it's the only mid-drive motor, it has by far the highest torque (120Nm vs 80Nm on the LT 8 and 85Nm on the LT 5/LT 6), and it carries the top Genius score at 74. It also costs less than either LT5 ($2649) or LT6 ($2549) while beating every sibling on claimed range (55mi vs 50mi) using the same 960Wh battery as the LT 8. The tradeoff is the simplified 3-speed automatic hub instead of a derailleur, but for most riders this is the easy pick in the lineup.
Biktrix Stunner LT 8 review Biktrix Stunner LT 5 review Biktrix Stunner LT 6 Medium review
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Biktrix Stunner Step-Over Auto is ranked on:
Guides worth reading
- Mid-drive vs hub motorWhere the motor sits changes how the bike climbs, what it costs, and what wears out. Neither is better everywhere.
- E-bike classes explained: Class 1, 2 and 3Three classes, two questions: does it have a throttle, and how fast does the motor keep helping.
- Nominal vs peak watts on an e-bikeThe wattage in the headline is usually the peak figure, which can be roughly double the number the motor actually sustains.
How we score: the Genius Score blends a bike's capability against same-price peers with its value for the money, weighted for what this commuter buyer prioritises. Specs are pulled from the manufacturer's live page and normalised (nominal vs peak watts, true weight with battery). Ratings are our estimate from specs, not a lab test.