2017 CERO One Review

Cero One Electric Bike Review
Cero One
Cero One Vp Nylon Platform Pedals With Grip Double Leg Kickstand
Cero One Shimano Ebike Battery 36v 14ah
Cero One Shimano Removable Display Panel Ergonomic Grips
Cero One Spanninga Axendo 80 2 Led Headlight
Cero One Standard Front Frame Rack 55 Lb Max Weight
Cero One Shimano Deore 10 Speed Shadow Plus
Cero One Spanninga Solo Integrated Ebike Tail Light
Cero One Standard Rear Rack Yepp Mount 14 Bosses
Cero One Optional Big Basket And Little Basket With Liners
Cero One Little Basket With Velcro Liner
Cero One 4 Amp Shimano Ebike Charger
Cero One Removable Shimano Steps Ebike Battery Pack
Cero One Electric Bike Review
Cero One
Cero One Vp Nylon Platform Pedals With Grip Double Leg Kickstand
Cero One Shimano Ebike Battery 36v 14ah
Cero One Shimano Removable Display Panel Ergonomic Grips
Cero One Spanninga Axendo 80 2 Led Headlight
Cero One Standard Front Frame Rack 55 Lb Max Weight
Cero One Shimano Deore 10 Speed Shadow Plus
Cero One Spanninga Solo Integrated Ebike Tail Light
Cero One Standard Rear Rack Yepp Mount 14 Bosses
Cero One Optional Big Basket And Little Basket With Liners
Cero One Little Basket With Velcro Liner
Cero One 4 Amp Shimano Ebike Charger
Cero One Removable Shimano Steps Ebike Battery Pack


  • A compact electric cargo bike inspired by the Japanese Mamarachi, it's easy to mount and steer, very well balanced, responsive, efficient, and capable
  • Features the new Shimano STePs 504 watt-hour battery pack which offers increased range and a refined charging interface, the display is large, feature-rich, and removable
  • Custom plastic fenders keep you dry, integrated Spanninga lights and reflective Schwalbe tires keep you visible, upgradeable cargo racks interface with child seat and baskets
  • Included frame lock uses the same key as the battery, sturdy double-leg kickstand makes loading easy and safe, highly adjustable stem fits many body types

Video Review





2017 One



Body Position:


Suggested Use:

Urban, Cargo

Electric Bike Class:

Pedal Assist (Class 1)
Learn more about Ebike classes


2 Years Comprehensive


United States

Model Year:


Bicycle Details

Total Weight:

56.3 lbs (25.53 kg)

Battery Weight:

5.8 lbs (2.63 kg)

Motor Weight:

7.05 lbs (3.19 kg)

Frame Material:

Aluminum Alloy

Frame Sizes:

18.5 in (46.99 cm)

Geometry Measurements:

18.5" Seat Tube, 22" Reach, 20.5" Stand Over Height, 28.5" Width, 72" Length

Frame Types:


Frame Colors:

Lightning White, Midnight Black, Halo Blue, Shio Grey

Frame Fork Details:

Rigid, Aluminum Alloy, 100 mm / 9 mm Hub, Skewer with Quick Release

Frame Rear Details:

135 mm / 9 mm Hub, Skewer with Quick Release

Attachment Points:

Rear Rack Bosses, Fender Bosses

Gearing Details:

10 Speed 1x10 Shimano Deore RD-M6000 GS Derailleur with Shadow Plus One-Way Clutch, Shimano CS-HG500 Cassette 11-42T

Shifter Details:

Shimano Deore SL-M610 Triggers on Right


Shimano Alloy 175 mm Length Crank Arms, 38T Chainring with Plastic Guard


VP-831p Nylon Platform with Inlaid Grip Tread


Tapered 1-1/8" to 1-1/2", Head Tube Angle 68°, SATORI EASY-UP ET, 40 mm Base Height, Telescoping Height Adjust (0 mm to 100 mm) with Twist Function to Save Space, Two 5 mm Headset Spacers


SATORI-UP2, 110 mm Length, Adjustable Angle (0° to 90°), 31.8 mm Clamp Diameter


Kalloy Aluminum Alloy, 680 mm Length, 31.8 mm Clamp Diameter, 17 mm Rise, 30° Sweep, Black

Brake Details:

Shimano Deore AM365 Hydraulic Disc with 180 mm Front Rotor 160 mm Rear Rotor, Shimano 3-Finger BRM355 Levers with Adjustable Reach


Ergon GC10, Ergonomic , 130 mm Length, Lock On, Black


Ergon SFC30-S, Chromoly Steel Rails

Seat Post:

Kalloy Aluminum Alloy, 34.9 mm Clamp, 15 mm Offset

Seat Post Length:

350 mm

Seat Post Diameter:

30.9 mm


Alexrims MD30, Aluminum Alloy Anodized, Double Wall, 35.5 mm Width, 20" Front 26" Rear, 32 Hole, Reinforcement Eyelets


Stainless Steel, 15G Front 14G Rear, Black with Nipples

Tire Brand:

Schwalbe Big Ben Plus, 20" x 2.15" Front, 26" x 2.15" Rear

Wheel Sizes:

20 in (50.8cm)26 in (66.04cm)

Tire Details:

30 to 55 PSI, 2.0 to 4.0 Bar, Performance Line GreenGuard, SnakeSkin, Reflective Stripe

Tube Details:

Presta Valve


ABUS Battery Locking Core Keyed to Match ABUS Shield 5650 Cafe Lock, Massload Double Leg Kickstand, Pulley Provision to Raise Chain Above Kickstand, Sunnywheel Custom Plastic Fenders (80 mm Width), Removable Alloy Rear Rack with 14 Threaded Bosses and Pannier Blockers and Yepp! Seat Window (77 lb 35 kg Max Load), Removable Alloy Front Rack Frame Mounted (55 lb 25 kg Max Load), Integrated Spanninga Axendo 80 Two-LED Aimable (80 Lux), Integrated Spanninga Solo One-LED, Nuvo Flick Bell, White Reflective Logos, Optional Small Basket with Liner $50 Upgrade or $100 Additional (Front or Rear Mounting, 4.1 lbs), Optional Big Basket with Liner $100 Upgrade or $200 Additional (Front or Rear Mounting, 5.1 lbs)


Locking Removable Battery Pack, 2.2 lb 4 Amp Charger, 11.6 Amp Motor Controller, KMC X10e Chain, Maximum Total Weight 270 lbs

Electronic Details

Motor Brand:

Shimano STePs, DU-E6050

Motor Type:

Mid-Mounted Geared Motor
Learn more about Ebike motors

Motor Nominal Output:

250 watts

Motor Peak Output:

500 watts

Motor Torque:

50 Newton meters

Battery Brand:

Shimano STePS, Down Tube, BT-E8010

Battery Voltage:

36 volts

Battery Amp Hours:

14 ah

Battery Watt Hours:

504 wh

Battery Chemistry:


Charge Time:

4.5 hours

Estimated Min Range:

35 miles (56 km)

Estimated Max Range:

90 miles (145 km)

Display Type:

Shimano STePs, SC-E6010, Removable, Adjustable Angle, Transflective Monochrome, Backlit LCD


Speed (mph or km/h), Average Speed, Max Speed, Odometer, Trip Meter, Range, Battery Level Percentage, Assist Mode (Off, Eco, Normal, High), Time Clock

Display Accessories:

Independent Button Pad near Left Grip (Hold Up and Down for Settings Menu, Hold Down to Activate Walk Mode Then Hold Down Again to Walk)

Drive Mode:

Advanced Pedal Assist (Measures Wheel Speed, Pedal Cadence, and Pedal Torque, Power Output Relative to Pedal Input: Eco 70% 30 Nm, Normal 150% 40 Nm, High 230% 50 Nm)

Top Speed:

20 mph (32 kph)

Written Review

Apparently in Japan there’s a type of bicycle called the Mamachari or “mom bike” that’s easy to approach, with a low stand over height, and very useful, because of its front and rear rack provisions. These bicycles are frequently used to transport children and goods around town and they inspired Kiyoshi Iwai, a Japanese transplant to America who spent more than a decade in the steel industry, to create a modernized electric assist version. The CERO One is the culmination and evolution of that creative endeavor and Kiyoshi and his business partner Felipe are launching it now in 2017 after three years of work. The One is what I would describe as a compact cargo e-bike, it’s capable and sturdy but doesn’t require the garage or apartment space of full sized models like the Yuba Spicy Curry. Measuring 72″ long and just 15″ wide when the handlebar is turned, it will fit into elevators, slide into bike racks, and squeeze into closets (when tipped up onto the rear wheel). You can only get this electric bicycle in one frame size at the moment, but the stem is highly adjustable and they claim it fits riders from 5’1″ to 6’4″. The stem telescopes up 100 mm and 110 mm stem adjusts from 0° to 90° so you could effectively double the height or position it way out to extend reach. Both adjustment parts are made by Satori and I appreciate the two-bolt clamp that will keep this stem secure on long bumpy rides. Many cheaper adjustable angle stems only use one bolt and can rattle loose as you ride over cracks and go off curbs. For this video review, I took the CERO One across grass, reached the top assisted speed of 20 mph, and forced a motor stall on a small hill. The bike felt pretty good even though it’s built around a rigid frame. There’s no suspension fork, seat post shock, or large plush saddle. Instead, you get a swept-back gullwing style handlebar with premium ergonomic grips and an active Ergon saddle. The tires are wider than normal at 2.15″ diameter and have a 30 to 55 PSI rating so you can lower the pressure a bit to improve comfort at the cost of efficiency. This is a more active bike, one that requires you to pedal vs. relying on a throttle mechanism, but it gets incredible range (between 35 and 90 miles depending on the level of assist chosen). The unique 26″ rear wheel and 20″ front wheel layout keeps the front rack low and steady, out of your view, and improves strength. It turns corners tight, has a walk mode feature (hold the down arrow to activate and then hold again to make it go forward slowly).

Driving the bike is a geared mid-motor from Shimano, the same company that produces the hydraulic disc brakes and 10-speed drivetrain. Their STePs electric bike system is light, efficient, and still very capable offering 50 Newton meters of torque, but it’s not as strong as the Bosch CX which offers 75 Nm or the Brose which offers 90 Nm. By comparison, many high-powered hub motors offer 20 to 40 Nm. I mention all of this because we’re talking about a cargo bike here. And it doesn’t have a NuVinci CVT or internally geared hub that can be shifted at standstill. You have to plan your shifts in advance and leverage low gears to get the motor to climb effectively. If you stop on a hill without shifting down and have a loaded bike, the motor may stall when you start from zero again. This motor is relatively quiet but does produce an electronic whine as you pedal faster or use the highest two assist levels. It is bolted onto a custom bottom bracket mount and keeps weight very low and balanced on the frame. Same thing goes for the 5.8 lb battery pack, it’s low and mounted near the motor. I love how CERO considered chain movement when mounting the motor and double-leg kickstand, notice the little sprocket just below the chainring. This raises the chain so it won’t rub and it also keeps it tight as you ride over bumpy terrain. Unfortunately, it seems like they forgot to add a slap guard sticker on top of the chainstay (or just didn’t think this was an issue). Sometimes, especially on mountain bikes, the chain will bounce into and chip the paint on the right chain stay. This is something you can add yourself later. I do love the four color choices, especially the white because it will be the most visible at night, and would want to keep the bike looking as clean and new as possible given the $3,399 price point. Felipe explained that they really scrutinized the paint and chose a 50/50 blend of gloss and matte to reduce fingerprints. Some final thoughts on the motor, it turns a 38 tooth sprocket which is protected by a plastic guard on the outside, it would be nice to have a guide here to keep the chain from falling off towards the inside but I didn’t notice this being an issue during my test rides. The 10-speed drivetrain is perfect for this bike and even has a Shadow Plus clutch to increase tension and reduce chain bounce if you are on rough streets. Just push the little grey lever into the up position. Leaving it down will make shifting slightly easier. And back to those brakes, with 180 mm / 160 mm you get plenty of stopping power and the adjustable reach levers are great for riders with small hands or those days when you might have puffy gloves on.

Powering the One is Shimano’s new BT-E8010 downtube mounted battery. It is way better than their older pack and here’s why… you get more energy (36 volts by 14 amp hours), it’s nearly the same physical size, it still slides out vs. clicking down (so the downtube and top tube can be very close together and lower the stand over height of the bike), and it uses a single charger interface vs. requiring a dongle. The electric bike charger itself is also improved, offering 4 Amps of power flow vs. just 2 or 3 as with most other electric bikes. The charger is a little heavy and bulky, but I’m assuming it’s safe and durable because Shimano is a premium brand with many years of experience doing electric bikes and electronic shifting. You can easily toss the charger into one of the baskets or a trunk bag on the rear rack to fill the battery at work or a friend’s house. Notice how good the black accents like those custom plastic venders, the grips, saddle, tires, motor casing, and battery all look on this bike. The thing is well balanced visually and you will be able to keep it looking nice because the battery and display are removable. It’s useful for lifting the bike as well, you can reduce weight by taking off all of the rack systems, the battery and display, and both wheels (which feature quick release). This does present the challenge of locking however, make sure you lock both wheels for longer stops. The rear wheel is easy to secure with the included ABUS cafe lock, and I love that it uses the same key as the battery. Consider a u-lock and cable to secure the front wheel and the rest of the frame.

Activating the CERO One is quick and intuitive. Once the battery has been charged and properly mounted, just hold the power button on the left side of the display for a few seconds. This will allow it to boot up and show your current speed, assist level, trip stats, and battery percentage. Hooray for Shimano, going with battery percentage vs. a five or ten bar battery infographic. It’s a lot more precise this way and you can use the percentage in combination with the range estimator menus to plan rides. As you arrow up and down through the different levels of assist, the range readout will dynamically update based on battery level, recent ride activity, and that level of power being used. Shimano has enlarged their display to make it easy to read and the transflective LCD works well in low and high light conditions. The button pad is easy to reach and interact with when riding without taking your left hand off the grip, and there’s an annoying beep sound that chimes each time you do make a selection. Thankfully, by holding the up and down keys simultaneously, you can enter into the settings menu and turn off this beep, switch from metric to standard, even change the font color from black on white to white on black (much less distracting for night riding). Perhaps the only complaint I have about the Shimano STePs ebike system as of today is that it does not have a USB power port to tap into like Bosch and others. This is handy for charging a phone on the go, especially with the new enlarged 504 watt hour battery pack. You may arrive at your destination with plenty of juice to spare but no way to access it for your ailing phone. All automobiles have 12-volt DC adapters (those round things) to plug into, and many newer cars have USB… so when you pay $3.4k for an electric bike to replace your car, I feel that it should include some of these creature comforts. Note that the smaller Bosch Purion display does not have a functional USB charger, so the Shimano system is not alone in lacking this.

At the end of the day, I feel like the CERO One electric bike could either be a compact high-quality commuter platform, a capable cargo bike for a delivery person (food, boxes, etc.), or a parent’s bike for him or her. The design and colors make it appealing to men or women, in my opinion, and it would definitely take the effort out of having to pull a trailer, add 40 lbs of child seat + child, or a big load of groceries. This is a capable, high quality platform that I would expect to last well. Even if CERO went out of business someday, Shimano isn’t going anywhere and will support this battery type for years to come. I definitely appreciate the drive system improvements over prior year and have been excited to see a bunch of compact cargo capable models lately such as the Orbea Katu-E 10 and Riese & Müller Tinker. Perhaps something like the BESV PSA1 would be more comfortable because it has suspension, and it is lighter, but it’s just not going to be as powerful or efficient. The One has filled a niche and I’m excited to see how it does in the coming years, kudos to the team. Big thanks to CERO for partnering with me on this review and meeting me in Santa Clara to film. I always enjoy meeting the team behind the product and really digging in… and I absolutely love the bottle provisions on the front rack and bosses :D


  • I was really impressed that they added a pulley wheel to keep the chain clear of the double-leg kickstand, this way the chain won’t rub when the stand is deployed! I was then immediately disappointed that the top of the chainstay does not have a clear plastic slap guard because it could get chipped up over time if you ride on bumpy terrain in high gears frequently, consider adding your own for ~$12
  • I love that this e-bike comes in four colors, the white appeals to me because it would be the most visible from the side when riding at night but all models have reflective paint accents and the black blends the battery, motor, fenders, and baskets the best
  • Most cargo bikes are long and wide, I love how the CERO One is only 72 inches long (that’s about the size of a regular bike) and has an adjustable stem that lets you turn the bar sideways to make it narrower
  • Whether you use this electric bike for cargo hauling or not, it’s very sturdy and nimble, the racks can be removed so maybe you only leave the rear on with a Yepp! child seat to reduce weight and keep it narrower? Many possibilities
  • Aside from the compact size and sturdy racks, one thing that really differentiates this bike is how easy it is to mount and stand over because of the mid-step frame and smaller front wheel, it feels stiff and strong but isn’t so overwhelming or difficult to mount
  • In the video review I kept commenting on the weight of ~56 lbs but I actually think this is great with both racks on the bike, fenders, lights, and larger tires… you can run the tires tubeless to reduce weight
  • The battery charges quickly thanks to a 4 Amp charger, it’s removable to reduce weight or charge separately for convenience (like if you commute) and the charger only has one plug now! No more dongle adapter which was easy to lose on older Shimano battery designs
  • I like have a range of gear choices (especially with a potentially loaded bike) and you get a quality 10-speed Shimano drivetrain here with Shadow Plus (the little grey lever) so you can position it up to tighten the chain if you ride fast on bumpy streets or down to loosen it for easier shifting
  • The Shimano hydraulic disc brakes perform very well, in some ways, the 180 mm front rotor is overkill because you also get a mechanical advantage from the smaller 20″ wheel diameter, these brakes are easy to use and have adjustable levers which is great for people with smaller hands
  • The rear rack has been tested to meet ISO heavier load standards of up to 75 lbs. However, CERO’s recommendation for the safest possible riding and handling of the bike is a combination of 55 lbs rear and 22 lbs front, or 22 lbs rear combined with 55 lbs in the front. They look good and have many mounting points but may require larger pannier clips because the side tubing is thicker
  • I came into this review thinking the bike did not have bottle cage mounts and then Felipe showed me that it does! There are two sets of bosses (one on either side of the front rack) and they include 10 mm spacers and mounting screws apparently, this positions your fluids or accessories within reach while riding and means you don’t have to leave them in the basket where they could roll around as you maneuver the bike
  • Very nice touch points, the Ergon saddle and Ergon locking grips are durable and active but tend to reduce hand and bottom fatigue which is key on a bike with no suspension
  • Unique pedal choice, the nylon platforms with imbedded grip here provide surface area and traction without the dangers of sharp pins that could scrape your leg if you foot comes off, it’s a good compromise and works well on this sort of bike even if your shoes get wet
  • The Shimano display really helps you overcome range anxiety because it shows a battery capacity percentage as apposed to some five-bar infographic and there’s a dynamic range calculation for each level of assist
  • CERO has been in the works for several years so even though they are doing a Kickstarter campaign and this is their first official release, they are more established than some other startup ebike companies and you get an excellent two year comprehensive warranty on the bike, the company is based in Los Angeles, California


  • The headlight is mounted well, beneath the front rack, so it won’t get blocked… but it doesn’t point where you steer because the rack is frame mounted for improved strength
  • There’s no suspension on this bike so, depending on where you ride, you might want to reduce the air pressure in the tires to improve comfort a bit (the range is 30 to 55 PSI), consider a 30.9 mm seat post suspension but note that it will raise the minimum saddle height by about three inches
  • The new battery pack is relatively lightweight at ~5.8 lbs considering how much electricity it can hold (504 watt hours) but it isn’t as easy to carry as the older one, there isn’t a clear lip to grip at the top like there used to be and there’s no loop like the similar looking Bosch battery has
  • I love that the new Shimano STePs ebike charger is fast, putting out 4 Amps vs. just 2 or 3, but it’s pretty large and a bit heavy at 2.2 lbs vs. Bosch’s 4 Amp charger which weighs ~1.7 lbs
  • The chainring has a plastic protector to help pants and skirts slough over and stay clean but it does not have a full chain cover or a chain guide to reduce drops, just a minor question or consideration compared to some other models I have seen
  • The Shimano STePs mid-motor used here does not offer shift detection and you cannot shift at standstill since the drivetrain uses a traditional cassette and derailleur, I mention this because it could be easier to mash gears if you’re starting out with a heavy load and shifting while pedaling, try to ease off on pedal torque just before you shift to keep the chain, sprockets, and derailleur in good shape
  • The shifter cables, electrical wires, and brake lines are well hidden below the downtube, but they are not internally routed the way that some other e-bikes are, this clutters the visual appearance and exposes them to more dirt and water but also makes servicing the bike easier
  • Minor gripe or area for future consideration, I wish there was a USB port to tap into the battery and keep your phone, music player, or additional electronic accessories filled (the Bosch Intuvia display offers this)


More CERO Reviews

CERO One Review

  • MSRP: $3,799
  • MODEL YEAR: 2021, 2022

A compact but very capable ebike inspired by the Japanese Mamarachi bicycle design. The mid-step frame is easy to mount and steer, very well balanced, and surprisingly powerful but quiet. It comes stock with custom fenders, two racks rated to 55lbs each, premium integrated lights, reflective puncture resistant tires, and a two year warranty.. This is the second generation build with Gates Carbon Drive belt vs. a chain, a…...

Comments (8) YouTube Comments

Kenneth Maruska
7 years ago

I really don’t understand why bike / motor manufacturers are not just putting 750W (ie max power motors) on every bike. The cost of the more capable motors is fairly small. My guess is that as battery capacity in increased with the new 21700 cells and or Li Polymer technology the bike companies will stop putting 250-500W motors on eBikes. In reality the federal regulation of 750W max has virtually no legal standing because both controller and battery voltage are part of the performance equation and it’s not like the police are going to have portable dynamometers to test if a bike is compliant or not.

Court Rye
7 years ago

Yeah, apparently in parts of Europe the police do have portable tools that can test in the wild. I have only heard this from one person but they work in the industry so I sort of believe them. I think in the US we are just getting what they sell overseas (in large quantities) but spiffed up a little to sound powerful or fast. In reality, I believe that a lot of the mid-drive motors are the exact same hardware, just overclocked a bit. Lower wattage means lower energy consumption and lighter weight (as is the case with the Shimano system especially) and I’m fine with that given my lighter body weight, range has never been an issue for me though and I’m a more active pedaler.

Pekka Jokiniemi
7 years ago

Hello Courtney; I really enjoy your videos. I notice that in several of your videos you mention the lack of water bottle bosses on many of the E bikes you review. Like you I enjoy having a bottle accessible. I recently discovered a product that many of your viewers may enjoy. Revelate designs, a US based company, manufactures a product called the “feed bag“. It mounts onto the stem of almost any bike and allows easy access to your bottle plus storage for small items. Eg. cell phone, wallet. It can also be easily transferred bike to bike. Check them out.

Court Rye
7 years ago

Thanks for the tip Pekka, it reminds me of chalk bags for rock climbers! I have seen massage therapists who use similar contraptions to carry around massage oil and stuff. This is a cool accessory and a great tip, thanks :)

Robert Foote
7 years ago


Thanks for another fine review. My question isn’t specific to the Cero bike, but since it uses the Shimano STePs drivetrain, I’ll ask it here. The top assisted speed for this bike is stated as 20 mph in this review. However, the Shimano website states “All three support modes will assist until 16mph.” Can you provide any information about this apparent discrepancy?

Court Rye
7 years ago

Hmm… you’re making me question my own experiences here but perhaps this is a geography thing. Like in parts of Europe they have a law that limits Class 1 electric bikes to 25 km/hr (which roughly translates to 15.5 mph). Maybe the resource you’re referencing is meant for that geography? I went to double check the website and indeed, saw the 16 mph reference here. Check out the Walleräng review video around 21:23 and watch for a minute. I film myself riding with one hand in the highest level of assist easily reaching 20 mph. So, unless Shimano has decided to tune-down their motors now or something, I think it’s a typo from their European spec.

3 years ago

Interesting bike. What brings me pause is the max weight is only 270 lbs.

3 years ago

Yeah, it’s very unique. I agree that the weight capacity is a bit odd. It’s a cargo bike, so you’d expect 300lbs vs. 250 (which seems to be the standard for regular ebikes). I’ve seen some go all the way up to 350lbs, but 270 is kind of in-between. I guess they are just being conservative, and this appears to be a lightweight cargo bike vs. the full sized longtail ones. The team was really nice when I did this review, perhaps they have even improved the bike since then :)


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