Biktrix Stunner Review

2019 Biktrix Stunner Electric Bike Review
2019 Biktrix Stunner
2019 Biktrix Stunner Bafang Mid Drive
2019 Biktrix Stunner Ergonomic Grips Display Controls
2019 Biktrix Stunner Cockpit View
2019 Biktrix Stunner Color Display
2019 Biktrix Stunner Front View
2019 Biktrix Stunner Rear View
2019 Biktrix Stunner Sturmey Archer Internally Geared Hub
2019 Biktrix Stunner Chain Ring Guard Platform Pedals
2019 Biktrix Stunner Bolt On Rack
2019 Biktrix Stunner Integrated Headlight Front Fender
2019 Biktrix Stunner Stock Step Through Blue
2019 Biktrix Stunner Electric Bike Review
2019 Biktrix Stunner
2019 Biktrix Stunner Bafang Mid Drive
2019 Biktrix Stunner Ergonomic Grips Display Controls
2019 Biktrix Stunner Cockpit View
2019 Biktrix Stunner Color Display
2019 Biktrix Stunner Front View
2019 Biktrix Stunner Rear View
2019 Biktrix Stunner Sturmey Archer Internally Geared Hub
2019 Biktrix Stunner Chain Ring Guard Platform Pedals
2019 Biktrix Stunner Bolt On Rack
2019 Biktrix Stunner Integrated Headlight Front Fender
2019 Biktrix Stunner Stock Step Through Blue

Summary

  • A comfortable cruiser ebike with an internally geard hub, mid-drive, throttle, and comfortable riding position as well as front suspension fork
  • A 750-1000watt mid-drive coupled with a smooth Sturmey Archer internally geared hub for easy and reliable riding
  • A powerful 48v battery that can be upgraded from the 11.6ah to 14ah, 17ah, and even 21ah, comes with a lot of features like plastic fenders, rear rack, integrated headlight, and adjustable length kickstand
  • No wire wraps, rear light is basic, and no hydraulic brakes despite the quick and powerful motor, but to be fair, the mechanical brakes are easier to maintain as well as adjust

Video Review

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Introduction

Make:

Biktrix

Model:

Stunner

Price:

$2,199

Body Position:

Forward

Suggested Use:

Cruising, Neighborhood

Electric Bike Class:

Throttle on Demand (Class 2)
Learn more about Ebike classes

Warranty:

1 Year Limited

Availability:

United States

Model Year:

2019

Bicycle Details

Total Weight:

64 lbs (29.02 kg)

Battery Weight:

9.5 lbs (4.3 kg)

Motor Weight:

8.5 lbs (3.85 kg)

Frame Material:

Aluminum Alloy

Frame Sizes:

19 in (48.26 cm)

Geometry Measurements:

19” Seat Tube, 27.5” Reach, 18.5” Stand Over Height, 27.5” Width, 33" Minimum Saddle Height, 76” Total Length

Frame Types:

Step-Thru

Frame Colors:

Prussian Blue, Cream, Charcoal

Frame Fork Details:

SR Suntour NRX 70mm Travel, Aluminum Alloy, 100mm Hub Spacing, 9mm Quick Release Skewer

Frame Rear Details:

135mm Hub Spacing, 9mm Skewer, with 12mm Axle Nuts

Attachment Points:

Fender Bosses

Gearing Details:

5 Speed Internally Geared Hub, 16 Tooth Sprocket

Shifter Details:

Sturmey Archer Half-Grip Twist Shifter

Cranks:

Aluminum Alloy, 170mm Length, 48 Tooth Chainring

Pedals:

Wellgo Aluminium with Reflectors and Pins

Headset:

1-1/8" non-tapered, non-sealed bearings

Stem:

Satori UP2, Alloy, Adjustable Angle 0° to 90°, 10 mm Stack Height

Handlebar:

Aluminum Alloy, Low-Rise, 590mm Length, 7° Backsweep

Brake Details:

Tektro Mechanical Disc Caliper, Tektro Three-Finger Levers with Rubberized Edge and Motor Inhibitors

Grips:

Ergonomic Rubber Locking Grips, Black

Saddle:

Faux Leather, 11.5" Wide Gel Seat with 2 Rear Springs

Seat Post:

Aluminum Alloy

Seat Post Length:

300 mm

Seat Post Diameter:

27.2 mm

Rims:

Double Wall, Aluminum Alloy, 25mm Outer Width, 36 Hole, Black

Spokes:

Stainless Steel, 13 Gauge Front and 12 Gauge Rear, Adjustable Nipples, Silver

Tire Brand:

Kenda K-Rad, 26" x 2.3" (58-559)

Wheel Sizes:

26 in (66.04cm)

Tire Details:

50 to 75 PSI, 3.5 to 5.3 BAR

Tube Details:

Schrader

Accessories:

Matte Black Rear Triangle Mounted Rear-Rack with Glove Retention Spring, LCD Control Center, Center-Mounted Kick Stand, Plastic Fenders, Integrated LED Headlight

Other:

Locking Removable Downtube-Mounted Battery Pack, 2 Amp Charger

Electronic Details

Motor Brand:

Bafang

Motor Type:

Mid-Mounted Geared Motor
Learn more about Ebike motors

Motor Nominal Output:

750 watts

Motor Peak Output:

1000 watts

Motor Torque:

120 Newton meters

Battery Brand:

Samsung

Battery Voltage:

48 volts

Battery Amp Hours:

12 ah

Battery Watt Hours:

576 wh

Battery Chemistry:

Lithium-ion

Charge Time:

4.5 hours

Estimated Min Range:

12 miles (19 km)

Estimated Max Range:

30 miles (48 km)

Display Type:

APT 500C, Fixed, Backlit, Full Color, Haptic Feedback

Readouts:

Battery Level (10 Bars), Speed, Assist Mode (0-5), Trip Distance, Total Distance, Average Speed, Max Speed, (Includes 5 Brightness Settings, Walk Mode, Time-Out Adjustment, Battery Read-out Preference)

Display Accessories:

Integrated Button Pad Near Left Grip, Buttons: +, -, Menu, On/Off, (Hold - for Walk Mode, Hold + for Lights, Hold M for Settings Menu)

Drive Mode:

Cadence Sensing Pedal Assist, Twist Throttle

Top Speed:

20 mph (32 kph)

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Written Review

To run the forums, host the website, and travel, I charge a universal service fee for my reviews. This review was sponsored by Biktrix. My goal is to be transparent and unbiased, this video and written review are not meant to be an endorsement of Biktrix products.

I was excited to check out the entire line up of the new Biktrix bikes, and I think I may have found my favorite among the group: the Biktrix Stunner. The Stunner is an electric cruiser bike with a super powerful mid-drive motor, smooth internally geared hub for shifting, and a a relaxed seating style. Everything works together quite well in harmony, but let’s go over some of the bike features before we get straight into that. So as I mentioned, it is a cruiser bike with a relaxed style and upright riding position. It comes in both a step-through and a high-step, as well as 3 different colors and a number of battery options. Today we are checking out the Prussian Blue step-through with the entry level battery. It retails for $2,199 and has a lot of comfort features like swept back handle bars that kind of meet you as you sit in the lower seat. This comfort is extended from the adjustable angle stem and front suspension fork. The front fork is a SR SunTour NEX fork with 70mm of travel and helps absorb the bumps quite nicely. For tires, the Stunner is equipped with a set of Kenda K-Rad 26” x 2.3” tires, so you get kind of higher volume and good grip at the same time which is really nice. These are rated for 50-75psi but I don’t think they offer any puncture protection here. The Stunner also has a battery integrated headlight. This is an LED light which is great for visibility, however, it is mounted on the front suspension fork, so the light could bounce up and down if you were on bumpy terrain. There are some nice plastic fenders here which are nice and light weight with a couple of points for adjustment…I love all the little features like the ergonomic grips and integrated bell, but probably my favorite is the included rear rack. This is a bolt on rack, which I personally prefer. Although frame integrated racks look cool, you lose the rack if you sell or crash the bike, where as the bolt on rack can be taken on or off, as well as upgraded if you so chose. This particular rack is set up well for panniers, something I really appreciate.

Driving the bike is a unique mid-drive motor from Bafang. This is a 750watt nominally rated mid-drive that has a peak rating of 1000watts and 120nm of torque! Very fast, very capable, and a lot of fun to drive. The bike is electrically powered by either the throttle mounted on the left, or by cadence based pedal assist. Either work great although cadence based systems can have a very pronounced feel of being ‘on’ or ‘off’. Complimenting the system very well is this internally geared 5 speed shifting hub. By using the Sturmey Archer internally geared hub, Biktrix eliminates gear-grinding potential and allows you to shift at standstill. This is great for riders who might not be as coordinated or familiar with traditional derailleurs and trigger shifters. With just 5 gears to choose from, it’s not as distracting and there’s just less that can go wrong… but it’s still nice to have 5 vs. 1 gear because it makes climbing and unpowered pedaling much easier. Stopping the Stunner is a set of 160mm mechanical disc brakes. I do like mechanical brakes since maintenance and adjustment is much easier, but I do think hydraulic brakes would have done well here to stop the powerful motor.

Powering the bike is a 48v 11.6ah lithium ion battery pack. I would consider this a high capacity battery pack and really necessary for that super powerful motor. But in case you wanted more juice, Biktrix offers battery upgrades on the battery to 14ah, 17ah, and a whopping 21ah… very cool! Anyway, the battery is mounted via lock and key, however, you don’t need the key to start the bike, it is just for battery security. The battery has a power button and I love the LED display read out on it so you can check to see round about how much juice is left. To really care for this and other lithium-ion packs, I have heard that storing in a cool dry location vs. extreme heat or cold will extend the life and try to keep it about 50% full when not using for long periods so you won’t stress the cells. Try not to let it run down to zero, because that’s really hard on the cell chemistry.

Another area worth mentioning here is the control center. I’m kind of a control center geek and I always love to see comprehensive stats while riding. The control center on the Stunner does just that. It displays pretty much everything, including current speed, top speed, average speed, range, battery level, pedal assist mode, wattage output and more. More importantly, I could read it in direct sunlight! The only downside to this display was that it’s not removable, so I might worry about it getting dinged up when the bike is being parked or transported and just taking more sun and rain damage over time. On the plus side though, it does have the ability to enable a passcode, adding another layer of security to the bike which is a bigger deal if you have kids around or are just concerned about safety. It does however angle, and I love that the controls can be pressed easily by your left hand since they are positioned well as to keep your eyes on the road. The only thing I could say is the controls for the display have a groove in them that can catch cloth and other material, so if you are wearing gloves for example, be aware of that.

When it is all said and done, I found the Stunner to be a ton of fun. The reason I like this bike so much is how complimentary the motor and internal hub work together, it has quite a refined feel for a value priced ebike at $2,199. However, there are some tradeoffs here so I did want to call those out. For example, the wires are a little out in the open up front, no wire looms to coral them in. Also, the integrated headlight is a nice touch, but having a rear light here would be perfect too. Probably the biggest tradeoff though is having such a powerful and fun system without hydraulic brakes. Hydraulic brakes provide more immediate stopping power, but the mechanical brakes here are still sufficient while being easier to maintain, adjust, and keeping cost down. Overall, the bike is really a blast and well put together, I would like to thank Biktrix for inviting me up to come check it out.

As always, I welcome questions and feedback in the comment section below. Whether you own a previous version of the bike, have taken a test ride, or are brand new to the space, my goal is to provide an objective and honest resource. You can also join the Biktrix Ebike forums and share your own photos, videos, and review updates to help others! Have fun out there, and ride safe :)

Pros:

  • A comfortable cruiser ebike with an internally geard hub, mid-drive, throttle, and comfortable riding position as well as front suspension fork
  • The system is very complimentary with the motor and internal hub working together, it has quite a refined feel for a value priced ebike at $2,199
  • The Sturmey Archer internally geared hub allows for shifting at standstill, should be cleaner and more reliable than a cassette and derailleur
  • The Sturmey Archer hub also allows for a single tight length of chain vs. a longer one that could fall off on bumpy terrain
  • It comes in both a step-through and a high-step, as well as 3 different colors and a number of battery options like 11.6ah, 14ah, 17ah, and 21ah!
  • Features swept back handle bars that kind of meet you as you sit in the lower seat, this works great wit the adjustable angle stem
  • I love the SR SunTour NEX fork with 70mm of travel which helps absorb the bumps quite nicely, also you have a higher volume tire with good treat for comfort as well
  • You get a great battery integrated headlight, this is an LED light which is great for visibility and safety, I love that more companies are including it
  • Rounding off the features is an included rear rack, this is a bolt on rack, which I personally prefer, because while the frame integrated racks look cool, you lose the rack if you sell or crash the bike, where as the bolt on rack can be taken on or off, as well as upgraded if you so chose
  • Features a powerful 750watt nominally rated mid-drive that has a peak rating of 1000watts and 120nm of torque! …very fast, very capable, and a lot of fun to drive
  • Large, easy to read color display with a lot of information and features you can deep dive into

Cons:

  • The controls for the display have a groove in them that can catch cloth and other material, so if you are wearing gloves for example, be aware of that
  • The wires are a little out in the open up front, no wire looms to coral them in, this could be annoying if you ever wanted to add any accessories on the stem or handlebars
  • Has an LED headlight which is great for visibility, however, it is mounted on the front suspension fork, so the light could bounce up and down if you were on bumpy terrain
  • For having such a powerful and fun system, you may expect hydraulic brakes, however, they are not here, hydraulic brakes provide more immediate stopping power, but the mechanical brakes here are still sufficient while being easier to maintain, adjust, and keeping cost down
  • Control center can’t be removed, leaving it vulnerable to theft and scratching when the bike is left at a public bike rack
  • Only one frame size may limit the range of rider heights the bike can accommodate

Resources:

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Comment (1) YouTube Comments

Robert Brooker
5 months ago

Question: Does the twist throttle completely override the PAS setting? I ask this as I have read some bike throttles will only take the bike to the maximum speed set by the pedal assist.

A second question is how does the pedal assists work? I have read from a different reviewer that the levels are essentially speed limiters.

  Reply

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