Dillenger Opia Folding E-Bike Review


Travelling to work sometimes requires more than one method of transport. For most of us, it’s driving to work and walking from the parking lot to that desk and seat we see way too often. Unfortunately for some people that walk is more like a marathon. Here’s where the Opia comes in, as it’s designed to help you get from to get you from point A to point B without having to break a sweat.

The Bike

This simple foldable bike presents us with a seamless, one piece like frame. This is foldable with a slightly bigger mid tube to house the battery. The Opia logo can be found on both sides of the Metallic white frame, with some contrasting from the black; handle bars, seat post and chain wheel. This small package all sits firmly on those 20” wheels.

Onto the motor now, you can find a rear hub that is capable of providing a nominal 250W output. This is found at the centre of the rims wrapped in Kenda road rubber which is what you need for a commuter bike. It provides a more efficient system which is also helped by the fixed forks at the front. This all contributes to a very smooth sailing ride with some comfort from the large plush saddle. So it won’t leave your backside sore before you even start work. I get more into detail in the riding section.

The brakes that are found on this are front and rear V-Brakes. The front brakes required me to fit them out of the box, so the performance is subject to the rider’s ability to set them up. That aside, we’ll show the brake test which can be found in the video review. In the video, I talked about how E-Biking Now is going to try to standardize the brake test. There are still a lot of variables, however we’ll try to give you guys a more accurate representation of the braking performances of the e-bikes. To do this, the camera is set up to show 10m of the testing road and where I slam on the brakes when I enter the screen. From here, the audience can deduce your own thoughts about the brakes. But don’t worry I’ll also talk about it in further detail my riding experience.

So with folding bikes, I like to compare the ease and practically of the folding frame. The Opia uses the common design with a pivot located at the centre of the main tube locked by a simple clip. This was very easy to use, alongside the simple foldable pedals and handlebar. For more detailed look at the folding of the Opia, refer to the video review.

The other features equipped are an LED headlight and USB charging port from the battery. The Opia has a 36V 7.8Ah battery found in the frame with an opening on the left. This here allows you to charge your bike, charge your devices via USB and also contains the on and off switch. The rubber flap makes it simple and easy to access as well. One thing that I would’ve like to have seen on the Opia is a bike rack. If a small foldable bike rack could have been incorporated into the design that would made the bike an ultimate commuter. In saying that, there are mounts on the rear end that allows the addition of a bike rack.

The Ride

At first the brakes weren’t that great but after bedding them in after a couple days of riding, it started to improve. They aren’t insanely responsive or powerful as you saw in the brake test. However they did stop around the 5m mark and keep costs and weight down. Basically, the Opia’s entire purpose is purely to get you from point A to point B, and if you need to stop in between, these v-brakes will stop you.

At first sight of the Opia’s motor, my thoughts were that it was tiny! I was skeptical about its performance, especially on the hills but its great! It’s real zippy. One thing that helps, and probably with climbing as well is the road tyres. These are thinner, giving us a smooth and low friction roll. Less friction means less work, and less work means less effort to get up hills. Also having the smaller wheels at 20” gave me a very responsive and agile ride.

Although the bike is small, the Opia’s design has been done really well to cater to all sizes. It held me in a comfortable position, and with adjustable seat and handlebars I could tailor this e-bike to fit me. The seat didn’t give me any pain and I rode around 4-5km each session. I think it’s very fitting for this bike because anything smaller and it would be uncomfortable and anything larger would just be too big and defeat the purpose of a mobile bike.

With a fixie design, you can expect this e-bike to be pretty rough on harsh surfaces. So if you are looking at this bike, know your route. If it requires some off road, or has a number of bumps and drops. I’ll probably reconsider the route or bike with front suspension at least. This is all just a sacrifice that needs to be made for efficiency which I think it’s worth it in a situation like this. Keeps costs low and makes the ride easier, which is what we need.

Diving into a bit more depth of the mechanics of the bike, the Opia will give you a pleasant ride. It’s smooth on the road with seamless shifting from the thumb shifter. I don’t think you could ask for anything more than this drivetrain for simple commuting. I found I sat in the 5th and 6th gear most of the time and let the electric motor start up for me. This allowed me to reach cruising speeds quick without having to change the gears too often.

The Dyno

For those who think numbers speak louder than words, you can find the E-Biking Now dyno results for the Opia below.

The Opia really showed its performance here, with a peak torque of 47Nm the Opia possesses a hub on the higher end of street legal motors. This explains the zippy ride I experienced that allowed me to start in high gears and use the motor to start me up. As usual, the power peaked at 351W. This is generally the figure we’d expect from street legal motors.

The Conclusion

So how did it stack up to my standards? Pretty good. Will it get you to work? Yes. Is it street legal? Yes. The bike is good, and it gets the job done as cheap and efficiently as possible. With USB charging, and a lightweight frame and flexible design to cater to riders of all heights and sizes. I can see this being a popular budget portable commuter.

There are some changes or preferences I would have liked to see which include an addition of a rear rack as standard. An e-bike like this would benefit greatly with a bike rack. Riders could hold their belongings or their groceries if they go shopping. Also an LCD meter would’ve been nice and the ability to turn off pedal assistance while the bike was on. Other than that, the bike will stand up to your tasks and get you from point A to B in minimal fashion. You can find the full specifications below*

*Specifications may differ from supplier

FrameFoldable Aluminium Alloy
Tyres20″ x 1.35″ road tyres
Brakes Tektro V Brakes
Brakes LeversDIA Compe DE1 Levers
GearsShimano Tourney 6 Speed
Front ForksN/A
KickstandSide Kickstand
Rear CarrierN/A
Seat Post and SeatN/A
MotorDillenger OEM 250W Geared Hub
ControllerDillenger OEM
Battery36V 7.8Ah
Charger2A SANS (4 Hours from zero)
Maximum Speed25km/h
RangeAverage 60km. Max 80km
Bike Weight18.2kg
Warranty2 Years on Battery. 3 Years on Motor, Display and Controller. Lifetime on frame.
Additional FeaturesBell

Built in frame battery

Charging ports on frame


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    • Hi Simon,
      I’m not certain, but I don’t think so.
      Dillenger have released the Opia 2.0 which updated the meter, however it’s still an LED one.
      I recommend you to contact Dillenger directly and ask if their new model has an LCD option.
      – Eric

    • Thanks Mark! I appreciate that.
      First off, I’ll just say that my answer is from my experiences. With electric bikes there are a lot of factors that affect the range and its ability to climb (e.g the initial speed you hit the hill, cycling experience, weight of rider).
      I never really rode the bike in low assistance settings, mostly high and medium. From that I got around 30-40km. The site does say it can average 45km on medium assistance so it seems about right. I would imagine low pedal assistance would last about 50-60km. Again, really depends on the ride (e.g hills).
      It somewhat can handle hills, but let’s just say I didn’t cruise up it like other mid-drive fitted bikes which could just throttle up the hill. You’ll need to go into lowest gear and pedal a bit, but nevertheless the bike will help you get up. The best way to determine if it can handle hills is to test ride one if possible. How big is the hill that you need to ride? You should also tell the answer of this question to eBike shops so they have some sort of idea on the power you need.
      Since you asked me this question and it being a very popular question, I think I might incorporate some sort of hill testing in my reviews that allow people to grasp a general idea on the bikes performance.
      – Eric

      • Thanks for the follow-up!
        A real-life 30-40km range at mid- and high-assist sounds pretty good for a 7.8Ah battery.
        Unfortunately, I live in a hilly area. The worst is an 18% incline, which I currently avoid.
        Your suggestion about discussing my likely usage with the bike shop is a good one.
        Keep up the fun and informative reviews! They’re a real help for people looking at ebikes.

        • No problem!
          Yeah quite impressive, but then again most of my riding was on flat road. So in your case, your range might differ.
          I’ll try and help you here, since you live in a hilly area (with that monster of a 18% hill!), I definitely recommend understanding your needs and what you need from your bike. Investing in your eBike will prevent you from regretting your purchase.
          With hills, front hub fitted bikes generally perform better due to your pedal strokes turning the rear wheel whilst the motor turns the front like an AWD system. But if budget isn’t a concern, I definitely recommend a mid-drive electric bike. They just climb hills with so much more ease.
          So I just got a couple of questions:
          What is the eBike used for? Commuting to work? Recreational?
          Do you have a budget?
          Do you need a portable foldable bike?
          – Eric

          • My budget would be below $2k, so the mid-drive options are out of the running.
            The bike would mainly be used for commuting, but would also be used for recreation. I prefer a folding bike so I can easily transport it in a car, but am open to other options. The Velectrix Urban may be another candidate.
            As you suggested I’ll visit a few bike shops, and try out the options.
            Thanks again for your help!

          • Yeah, most mid-drives are $2,000+
            I definitely recommend a full size eBike if you’re commuting and using it for recreation on the weekends. The larger wheels and higher capacity battery help with travelling further and faster.
            It would be amazing if we could have everything; compact, powerful and cheap. Unfortunately for us, we can only pick two out of the three.
            If money wasn’t an issue I would recommend checking out the Kalkhoff Sahel. If size wasn’t an issue, I would test out the Velectrix as you mentioned. I’ll actually be reviewing the urban soon (so be on the look out for that). If hills wasn’t an issue, the Opia would be the suggested bike. There is one bike I can think of which is foldable, and has decent power to get you up the hills, only issue is I’m not 100% sure if it’s street legal. Contact ebikery for the Fat-E Mini. It’s currently at $2,499 but I think I have seen it on special for $1,999.

  1. Hi Eric,

    Thanks for the great replies.
    I’m very invested in the Opie, mostly for it’s compact size. I also live in a hilly area. I’m 90kg so pretty heavy. I just worry about this bike having enough power. I can’t find many other small folding ebikes that have more though. Are there any others you know of?

    • It’s my pleasure!
      Haha that’s a cute name for it, the Opie.
      You’re about the same weight as me, and you live in a hilly area, so you’re likely going to run into issues. Like I said to Mark, the bike will somewhat get you up hills but I put a bit of effort into pedalling and that was only a few hills. If your trip has a lot of hills, either the eBike won’t help you as much as you’d want up some certain hills, or it won’t last long enough (because using peak power drains battery quicker).
      This will be the same situation for most foldable compact eBikes as they utilise 250W or less motors with small batteries.
      Since you like compact eBikes, I can’t recommend bigger bikes with bigger motors. So your best bet is a compact model with a mid drive motor.
      Take a look at the Riese & Müller Tinker. Compact and mid driven. Same goes for the Kalkhoff Sahel. I haven’t reviewed them, so I can’t say how they perform or if they’ll suit you, but it’s somewhere to start. With that being said, (like I said to Mark) I would recommend test riding the Opia if possible because it is a nice bike. Especially the updated V2.0 model. See if you can get a test ride and determine if it’ll suit you. Best of luck!
      – Eric

      • Thanks Eric,

        Do you know anywhere that has one to test drive around Sydney to test ride?

        My current ebike (Dyson 26″ folding” has been amazing. That’s a rear drive 200watt motor and much heavier at 25kg. I’m hoping the Opia would therefore be stronger at the main hill I have to make it over.

        My commute is relatively short. It’s only 6km so battery life isn’t an issue either.
        Only reason I’m selling my Dyson is that I’ve moved and am now on the 4th floor with no lift so a lighter folding bike would be great.

        What do you think? Would the 250watt Opia be as good, or maybe even better than the 200watt Dyson?

        The only other thing is the max speed at 25km. Is there anyway to unlock this? A large part of my ride is off road where I’d love to crank up the speed more. Any way way to hack past the 25km lock?

  2. Hi Eric,

    One last question..

    You’ve tested both the Opia and the Uhvo folding bikes. Which one would you go for? Again I do a small 6km commute. The Uhvo has a lot of features I like… removable battery, LCD screen, lightweight, etc. But I’m worried about the smaller wheels over the Opia.

    Any advice?



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