1000W Bafang Ultra motor. 160Nm of torque. 90+ mile range. The same drivetrain found in $5,000 bikes — priced like a clearance mistake. Because it is one.
Our warehouse ordered 34 more than we needed. Rather than ship them back and eat the loss, I'm passing the savings to you. Same bike. Same warranty. Very different price.
Last month, our warehouse ordered 147 of these bikes. We needed 113. That's 34 bikes I either ship back at a $35,000 loss — or sell to you at cost.
You're getting the exact same Ultra Duo 4 Step-Over we sell for $3,499. Same warranty. Same support. Same everything. I just need them gone.
Because at $2,199, you're probably wondering where we cut corners. Spoiler: we didn't.
This isn't some generic hub motor from Alibaba. The M620 is the most powerful production mid-drive motor you can buy. It's what brands like Frey, Bakcou, and other $5,000+ bikes use.
1000 watts of continuous power. 160Nm of torque — that's more than some motorcycles. It doesn't just assist your pedaling; it transforms it.
910Wh of capacity hidden cleanly inside the downtube. That's not marketing fluff — that's 90+ real-world miles on a single charge.
Most bikes at this price give you a 10Ah battery and call it a day. We nearly doubled it. And if you want even more? Add the range extender to go even further.
The classic step-over design gives you maximum rigidity and control on any terrain. Built from 6061 aluminum with a 380lb load capacity — this frame is ready for serious riders and serious cargo.
Available in two sizes (Medium 17" and Large 19") to fit a wide range of riders. Pair it with fat tires or MTB wheels depending on your terrain.
Component-by-component, here's what this bike would cost to build:
Up to 28 mph top speed with pedal assist. Throttle available up to 20 mph.
Torque + cadence sensor provides natural, responsive power delivery.
Front and rear lights powered by the main battery. Always ready.
DPC-18 display shows speed, battery, trip data, and assist level.
The Bafang Ultra M620 is the gold standard in mid-drive motors. Here's what other brands charge for it:
| Bike | Motor | Torque | Battery | Price |
|---|---|---|---|---|
| Bakcou Storm G2 | Bafang M620 | 160Nm | 48V 17.4Ah | $5,199 |
| Frey AM1000 V6 | Bafang M620 | 160Nm | 48V 21Ah | $5,180 |
| QuietKat Apex Pro | 1000W Mid-Drive | 160Nm | 48V 16Ah | $4,999 |
| Rambo Rebel 2.0 | Bafang BBSHD | 160Nm | 48V 15Ah | $3,499 |
| Biktrix Ultra Duo 4 | Bafang M620 | 160Nm | 52V 17.5Ah | $2,199 |
The Ultra Duo 4 Step-Over has the same motor as $5,000 bikes — with a massive 910Wh battery. The only difference? Our warehouse manager can't count.
Last month, I got a call from our warehouse manager. "Hey Roshan, we have a problem."
147 bikes ordered. 113 needed. A $140,000 mistake.
I had two options: Ship them back and eat a $35,000 loss, or pass the savings to you.
These are the exact same bikes we sell for $3,499 every day. Same warranty. Same quality. Same everything — just a very different price tag.
"I've had it four summers now. This summer I put on approx. 4,000 km. It's been a very good bike overall. No regrets on buying it."
"I bought an e-bike at 77 years old. Friends and family ribbed me. It's one of the best things I have ever done for myself. It has kept me fit and feeling youthful."
"I ride it daily to commute to work and run errands. This bike exactly meets my needs reliably and consistently. After 10k miles, I'll probably order a new one."
"I use my Ultra Duo 2 for hunting steep mountains a lot. I tow my Labrador in a cart behind me up steep hills to save her energy getting to hunting spots."
"Biked from Vancouver store to Westshore on Vancouver Island — 128km total. Had about 54% left, or 73km still in the tank."
Don't just take our word for it. Our private Facebook group is where real owners share rides, mods, tips, and unfiltered opinions. See what people actually think before you buy.
Browse the Group →No purchase required. Lurk all you want.
Yes. Identical. Same SKU, same components, same warranty. The only difference is the price tag — and how many I need to move to clear this inventory mistake. You're getting the full experience at a fraction of the cost.
You could. But you'd get a $400 hub motor instead of an $800+ Bafang Ultra mid-drive. A 10Ah battery instead of 17.5Ah. No warranty support. No real company behind it. The Ultra Duo 4 Step-Over competes with bikes in the $4,000-5,000 range — this sale just brings it down to earth.
Shipping is FREE to the continental US. Your bike ships from our American warehouse and typically arrives within 7-10 business days. Fully insured, fully tracked.
You have 15 days after delivery. If it's not everything you expected, send it back. We'll refund your purchase. No questions, no hassle. But honestly? Our return rate on this bike is under 2%. People love it.
Full 2-year warranty included (4-year available with BiktrixCare+). Our support team is based in North America — real humans, not chatbots. We've been building e-bikes since 2015 and have 40+ employees and 5 retail stores. We're not going anywhere.
The Ultra Duo 4 Step-Over comes in two frame sizes: Medium (17") for riders 5'6"+ with a 30"+ inseam, and Large (19") for riders 6'0"+ with a 33"+ inseam. If you're between sizes, reach out and we'll help you find the right fit.
If the Ultra Duo 4 Step-Over doesn't blow you away — if it's not the smoothest, most powerful e-bike you've ever ridden — send it back within 15 days. Full refund less shipping fees. We'll even help arrange the discounted return shipping. Zero risk.
Two frame sizes available. Here's the breakdown:
| Measurement | Metric | Imperial |
|---|---|---|
| Effective Top Tube Length | 620mm | 24.4" |
| Seat Tube Length | 410mm | 16.1" |
| Reach | 470mm | 18.5" |
| Stack | 600mm | 23.6" |
| Chainstay Length | 485mm | 19.1" |
| Standover Height | 730mm | 28.7" |
| Head Angle | 65° | |
| Seat Angle | 74° | |
| Head Tube Length | 150mm | 5.9" |
| Fork Length | 540mm | 21.3" |
| Front Center | 830mm | 32.7" |
| BB Drop | 60mm | 2.4" |
| Fork Offset | 50mm | 2" |
| Wheelbase | 1280mm | 50.4" |
| Total Length | 2000mm | 78.7" |
| Max Seat Height | 950mm | 37.4" |
| Min Seat Height | 780mm | 30.7" |
| Handlebar Height | 1080mm | 42.5" |
After midnight on February 28th, the price increases to $2,599 — regardless of remaining stock.
