REVIEW: QR-E 250W ELECTRIC BOOSTER BICYCLE MOTOR AND B60i AND B70 BATTERY

[ybao]

As someone who loves e-bikes, I truly enjoy admiring these models.
The Qiroll e-bike attracts me with its delicate design and light, elegant character, and it would be even more appealing with the addition of a pedal-assist (PAS) cadence-sensing system.
I also came across the GBoost e-bike, which stands out for its strong climbing capability, giving it a confident and capable presence.

GOOST ebike

 

[3dxl]

My Qiroll Pro still powering good on my bike in 2026 during daily commute. No problem. Battery still runs well since my first post. Anyone still rocking Qiroll?

Video:

 

[3dxl]

Another bike with Qiroll Pro (latest version) still alive after daily abuse on all weather. However it started to sound like turbine jet like the first one if i keep boosting/throttle up. I suspect the inner clutch was loose or grinding along.

 

[BluePixel]

View attachment 208574
Another bike with Qiroll Pro (latest version) still alive after daily abuse on all weather. However it started to sound like turbine jet like the first one if i keep boosting/throttle up. I suspect the inner clutch was loose or grinding along.

I had the same problem. Today I decided to teardown the motor as deep I could without destroying it... And I have good news. Behind the Metal Discs on the side of arm (on Mute Pro: plastic design parts) there are the screws which fixate the motor. I took the screws out and pried the black plastic sides on the motor off. I didn't got deeper than this but I cleaned everything and put some oil on the barrings ( I don't know if it was a good idea) and screwed everything back in place. And now it is silent again . I don't know if it was the oil or the cleaning or both feel free to test...

I think there are no gears or clutch inside because of the very clear magnet fixation you can feel while turning it slowly with your hand. That's definitely a good thing for robustness.

 

[3dxl]

I had the same problem. Today I decided to teardown the motor as deep I could without destroying it... And I have good news. Behind the Metal Discs on the side of arm (on Mute Pro: plastic design parts) there are the screws which fixate the motor. I took the screws out and pried the black plastic sides on the motor off. I didn't got deeper than this but I cleaned everything and put some oil on the barrings ( I don't know if it was a good idea) and screwed everything back in place. And now it is silent again . I don't know if it was the oil or the cleaning or both feel free to test...

I think there are no gears or clutch inside because of the very clear magnet fixation you can feel while turning it slowly with your hand. That's definitely a good thing for robustness.

I did manage to remove three screws but all i got was a an enclosed metal cylinder and 3x wires connected. I still dumb founded on how to open the cylinder motor as i don't see any screw enclose it. This is on PRO model. I knew the motor inside is still spinning when i stop the bike/ brake abruptly to a halt (stop) but the motor can be heard spinning and i felt the internal clutch is not engaging it fully while the outer roller not moving at all. I have to unplug the battery to turn it off. ** Qiroll engineer support please take note of that.

 

[glerner]

Maybe interesting for some people , I am not using my to much and I don t want the battery to die so I make a small box with an usb port so Incan charge mobil or other device when I go camping

 

[shinhao]

Hi everyone! I'm running a Qiroll motor on my Strida LT. Specifically, I'm using the QR-E PRO-MAX model.

The stock setup uses a fixed screw to set the gap, but as my friction tape wears down and my tire pressure drops slightly, a gap starts to form. This leads to slipping and power loss.

Since I'm on a Strida with standard tires (I can't pump them up as high as road tires), this happens more often than I'd like. I'm tired of manually adjusting that screw every few rides. Does anyone have a better way to keep the motor tight against the tire automatically? Thanks for any advice!

 

[RunForTheHills]

I didn't know they still made friction drive motors. Isn't it tensioned by a spring? I would recommend going to a mid-drive or hub drive motor kit instead.

 

[EMGX]

I used a spring loaded door hinge, the kind that you can adjust tension. The ones with a strong spring worked best but there can be fitment issues due to the length of the hinge so it depends on the mounting location and clearances for your specific bike.

 

[shinhao]

I didn't know they still made friction drive motors. Isn't it tensioned by a spring? I would recommend going to a mid-drive or hub drive motor kit instead.

I didn't know they still made friction drive motors. Isn't it tensioned by a spring? I would recommend going to a mid-drive or hub drive motor kit instead.

Thanks for the suggestion! I actually considered buying a new e-bike, but I really wanted to try modding this classic Strida LT first. I only need a little boost for starting from a stop, hitting hills, or fighting headwinds in the city. It’s more about giving an old bike a second life than having a high-power machine!"

 

[shinhao]

I used a spring loaded door hinge, the kind that you can adjust tension. The ones with a strong spring worked best but there can be fitment issues due to the length of the hinge so it depends on the mounting location and clearances for your specific bike.

"I've actually seen your thread and the photos you shared! It’s a genius way to maintain constant downforce. I’m definitely going to give the spring-loaded door hinge a try. Thanks for sharing such a clever solution!"

 

[EMGX]

Post up pictures when you get around to it. This thread has a lot of potentially helpful information on a number of aspects for Qiroll users.
I've used a few different types of spring door hinges, they all worked for my applications. They tended to be made of stainless steel which can be a challenge to drill mounting holes. I found carbide bits and oil helped (along with patience).

 

[glerner]

Hi everyone,

I'm looking for an alternative/second battery pack for my Qiroll (so when I travel to another country I can buy one online in advance )kit on AliExpress, and the search engine there is a nightmare.

Jason from Qiroll told me to get I a 33.3V (9S) lithium battery pack with an integrated BMS.

Does anyone have a current, working AliExpress link to a reliable seller or custom builder that provides this exact 9S setup?

Thanks in advance for any links or store recommendations!

 

[harryS]

Hi everyone,

I'm looking for an alternative/second battery pack for my Qiroll (so when I travel to another country I can buy one online in advance )kit on AliExpress, and the search engine there is a nightmare.

Jason from Qiroll told me to get I a 33.3V (9S) lithium battery pack with an integrated BMS.

Ask Qiroll about the maximum voltage that his controller can support, A 9S lithium will be 27V minimim and 36.8V max and commercially unavailable. It's just an odd voltage, A 10S will run 30V to 42V and is popular for power tools and ebikes.

The Ryobi 40V tool batteries are actually 10S and I have used mine to run my ebikes. . I had to make an electrical clip ro connect it to my bikes. Hobbyists will sell you a better 3D printed part. Genuine Ryobu batteries are welll made. Some are small enough at 120WH to meet some airline regulations for carry-on, but I believe most lithium should be banned from airplanes. However, you should be able to buy one in the destination country.


Recently, I was at an Ryobi discount outlet store and they were selling these chargers for $5 USD. Even if it didn't work, the unit could be rewired as a battery cradle. Of course, I bought it to use as a charger,I don't have to run my ebikes on these batteries these days, but I did 8 years ago.

There are also 24V tool batteries that should spin the Qiroll. Might be fast enough for you,

 

[EMGX]

Hi everyone,

I'm looking for an alternative/second battery pack for my Qiroll (so when I travel to another country I can buy one online in advance )kit on AliExpress, and the search engine there is a nightmare.

Jason from Qiroll told me to get I a 33.3V (9S) lithium battery pack with an integrated BMS.

Does anyone have a current, working AliExpress link to a reliable seller or custom builder that provides this exact 9S setup?

Thanks in advance for any links or store recommendations!

Keyde sells a 33v battery in 7ah and 10ah versions, they must be 9s but you can check with them and if available on AliExpress.
The Qiroll battery charges to 37.8v as you can see by checking the output voltage printed on your charger and/or testing your fully charged battery with a voltmeter. A previous post in this thread indicated that the Pro model won't work above 38v. I've briefly run my Pro on the Qiroll 24v battery (charges to 25v) and it seemed to work normally. As Harry mentioned a 24v power tool battery might work but a 40v power tool battery would exceed the 38v controller cutoff. Power tool batteries that I've used are rated at fully charged voltage rather than nominal voltage. Two Ryobi 18v batteries run in series could work with the Qiroll Pro - I have Ryobi power tools and several batteries and might try that at some point just to see. Another option is to use a 36v (with sufficient amperage capacity) Buck converter along with a 48v battery of your choice.

Edit: as expected the Keyde 33v battery is advertised as 9s. I have some Keyde stuff and it appears to be good quality to me.
Keyde BI3311 330Wh Water Bottle Shape Battery Bicycle Mount 500 Watt 33V 11Ah 9s

 

[kevinmccune]

Ask Qiroll about the maximum voltage that his controller can support, A 9S lithium will be 27V minimim and 36.8V max and commercially unavailable. It's just an odd voltage, A 10S will run 30V to 42V and is popular for power tools and ebikes.

The Ryobi 40V tool batteries are actually 10S and I have used mine to run my ebikes. . I had to make an electrical clip ro connect it to my bikes. Hobbyists will sell you a better 3D printed part. Genuine Ryobu batteries are welll made. Some are small enough at 120WH to meet some airline regulations for carry-on, but I believe most lithium should be banned from airplanes. However, you should be able to buy one in the destination country.

View attachment 210636
Recently, I was at an Ryobi discount outlet store and they were selling these chargers for $5 USD. Even if it didn't work, the unit could be rewired as a battery cradle. Of course, I bought it to use as a charger,I don't have to run my ebikes on these batteries these days, but I did 8 years ago.
View attachment 210637
There are also 24V tool batteries that should spin the Qiroll. Might be fast enough for you,

the battery adapters are easy to come by.

 

[glerner]

Kust got a solution from Qiroll :
If you can get a 10S battery locally , it will be perfectly okay. The QRE Pro Max is designed for 37.2V batteries, while a standard 10S 36V battery reaches a full charge voltage of 42V. You just need to bring along your original Pro Max charger. Simply connect the charger to this newly paired 10S battery (nominal 36V, full charge 42V) and you can start using it.

When the battery voltage drops below 37V, connect the charger to recharge it. This way, the 10S battery can function as a 9S battery. You will only lose roughly 10% of the total capacity, and the battery will work properly.

We recommend choosing a battery with a single port for both charging and discharging, as this type supports our regenerative braking function. If your battery uses separate ports for charging and discharging, regenerative braking will not be available, yet all other functions will work normally.

Additionally, since you are using a third-party battery, we suggest picking one with a larger capacity. With sufficient capacity, regenerative braking will have limited practical impact on your use.