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

[3dxl]

You may want to convince Jason to offer the 3M Grip Tape or something similar for their product. It sounds like a game-changer and alters the ability of the Qiroll to do what it's meant to do.

I think you should get 3M floor grip tape from local hardware store better, you can test several type of surface rough abrasion that suits your tire and cheaper per-roll tape. Here i can get it around $1~3 per-roll which can last me 1 to 2 year of use. Like this one: https://www.3m.com/3M/en_US/p/c/tapes/anti-slip-grip/

 

[metanewbie]

I think you should get 3M floor grip tape from local hardware store better, you can test several type of surface rough abrasion that suits your tire and cheaper per-roll tape. Here i can get it around $1~3 per-roll which can last me 1 to 2 year of use. Like this one: https://www.3m.com/3M/en_US/p/c/tapes/anti-slip-grip/

Is this it?

 

[3dxl]

Is this it?

Yes! That's it! Go get one.

When you get your Qiroll try the original friction tape first and ride everywhere including pedalling up the hill before install the 3M to experience the ride differences between each type of tape so you can appreciate the differences.

*Ps: Wow $13! Mines just under $3. Btw both still worth it.

 

[metanewbie]

I think you should get 3M floor grip tape from local hardware store better, you can test several type of surface rough abrasion that suits your tire and cheaper per-roll tape. Here i can get it around $1~3 per-roll which can last me 1 to 2 year of use. Like this one: https://www.3m.com/3M/en_US/p/c/tapes/anti-slip-grip/

I'm also considering whether to get the Pro, which is $439, or the Flex for $198 with these batteries for $147.

I realize the Pro has slightly more power, but using any 36-volt battery is very tempting. I could expand the range at minimal cost.

Jason mentioned I should consider the Flex if I have the 36-volts available. He must not consider the wattage difference that important.

 

[metanewbie]

Yes! That's it! Go get one.

When you get your Qiroll try the original friction tape first and ride everywhere including pedalling up the hill before install the 3M to experience the ride differences between each type of tape so you can appreciate the differences.

*Ps: Wow $13! Mines just under $3. Btw both still worth it.

It's probably because of Amazon Prime. I will check around the local hardware stores as well. But Prime is just very convenient.

 

[3dxl]

I'm also considering whether to get the Pro, which is $439, or the Flex for $198 with these batteries for $147.

I realize the Pro has slightly more power, but using any 36-volt battery is very tempting. I could expand the range at minimal cost.

Jason mentioned I should consider the Flex if I have the 36-volts available. He must not consider the wattage difference that important.

Better get the PRO version with H70 battery pack if you wanted to experience actual ebike performance. Its kind of dangerous to use external/non-compatible battery mated with PRO because if the QIROLL PRO unit does an accidental re-gen activation the battery will get hit by unwanted 'recharge back' and might get damaged. Some battery does not perform well when discharged to power the drive unit and recharge back at the same time (Depends on internal BMS board). Even if you use voltage regulator to step down the battery voltage the re-gen feature will unintentionally going to destroy the voltage regulator. That's based my experience building lithium/li-on battery packs for my RC models. "Its better pay once than paying twice for mistake."

 

[metanewbie]

Better get the PRO version with H70 battery pack if you wanted to experience actual ebike performance. Its kind of dangerous to use external/non-compatible battery mated with PRO because if the QIROLL PRO unit does an accidental re-gen activation the battery will get hit by unwanted 'recharge back' and might get damaged. Some battery does not perform well when discharged to power the drive unit and recharge back at the same time (Depends on internal BMS board). Even if you use voltage regulator to step down the battery voltage the re-gen feature will unintentionally going to destroy regulator. That's based my experience building lithium/li-on battery packs for my RC models. "Its better pay once than paying twice for mistake."

Yeah, the Pro seems a bit faster. But have you seen the Flex? It's specifically designed to accept 36-volt batteries.

Here it is: https://qirollshop.com/product/qr-e-flex-motor/

But yeah, the drawback is the Flex is only 240W, whereas the Pro is 320W.

I imagine the Pro's 80 extra watts would make a significant difference for climbing hills. So I'm probably going to get the Pro as you advise.

It's unfortunate, they don't make a 320W Flex. That would be an ideal combination.

 

[3dxl]

Yes i've seen the Flex but due to my nature doing daily commute and brushing with road traffic i need 320W for safety reason and getting good sleep after few hill climbs. I don't want muscle pain and get chased by dogs.

 

[metanewbie]

Yes i've seen the Flex but due to my nature doing daily commute and brushing with road traffic i need 320W for safety reason and getting good sleep after few hill climbs. I don't want muscle pain and get chased by dogs.

I've seen your videos. Quite incredible! Do you have any of yourself using the Pro and going up hills? Just wondering how that is.

 

[3dxl]

I've seen your videos. Quite incredible! Do you have any of yourself using the Pro and going up hills? Just wondering how that is.

I can't recall if i posted that hill climb video on twitter, however its always keep on pedaling 40% effort with the throttle button keep pressed on giving me a crawl speed of 10~15km/h up the 20% gradient slope reaching around 80 meter elevation.

 

[metanewbie]

I can't recall if i posted that hill climb video on twitter, however its always keep on pedaling 40% effort with the throttle button keep pressed on giving me a crawl speed of 10~15km/h up the 20% gradient slope reaching around 80 meter elevation.

Seeking your wisdom.

My plan would be to get a QiRoll Pro, two quick-release adapters, and a second Qiroll S2 start switch + Power cable. I would swap the Qiroll Pro and a battery between my bicycles and get a second QiRoll Pro later, so I'd have two batteries.

What do you think of that?

 

[metanewbie]

Yes! That's it! Go get one.

When you get your Qiroll try the original friction tape first and ride everywhere including pedalling up the hill before install the 3M to experience the ride differences between each type of tape so you can appreciate the differences.

*Ps: Wow $13! Mines just under $3. Btw both still worth it.

I see an option for 1", 2", and 4" width grip tape. Which size should I get? I'll order it before I get the Qiroll Pro. Thanks!

 

[3dxl]

Seeking your wisdom.

My plan would be to get a QiRoll Pro, two quick-release adapters, and a second Qiroll S2 start switch + Power cable. I would swap the Qiroll Pro and a battery between my bicycles and get a second QiRoll Pro later, so I'd have two batteries.

What do you think of that?

Should be no problem with quick release adapter if you wanted to be frugal with one unit of Pro swapping about.
Btw i love your folding bike, that's the one i'm planing to get for next Qiroll Pro project. I'm aim for Fnhon Gust brand model like yours, looks identical. Is that a 16" wheel?

..

I see an option for 1", 2", and 4" width grip tape. Which size should I get? I'll order it before I get the Qiroll Pro. Thanks!

My grip tape width is 25mm, fits exactly on Qiroll Pro roller groove.

 

[metanewbie]

Should be no problem with quick release adapter if you wanted to be frugal with one unit of Pro swapping about.
Btw i love your folding bike, that's the one i'm planing to get for next Qiroll Pro project. I'm aim for Fnhon Gust brand model like yours, looks identical. Is that a 16" wheel?

..


My grip tape width is 25mm, fits exactly on Qiroll Pro roller groove.

View attachment 185155

Thanks for the measurement info!

Yes, 16" wheel. This is the bicycle. I modified the drive train with 52T NW Chainring, Microshift Advent SuperShort RD with clutch, 11-38 cassette, and Microsoft thumber shifters (in friction mode.) My 700c hybrid has 30T NW chainring and the same Microshift components. They have nearly identical gear-ratios for a common riding feel, and I can stock up on the same cassettes for both.

I watched your installation video, so the QR swap method might not work if the Qiroll Pro has to be adjusted each time per bicycle. Would that be the case?

 

[3dxl]

How fast can you ride with 16" with that gear ratio. I have similar gear ratio with Shimano Tiagra group set ready for my folding project. (have problem with dogs around the neighborhood). I can't wait to see how you install Qiroll Pro on this frame.

Btw yes Qiroll Pro need to be adjusted per-bike. Sometime takes time to find the 'sweet spot' during adjustment where i get right amount of grip contact and rolling resistance pressure during mechanical clutch adjustment. This why i prefer permanent installation than swapping about to avoid hassle especially if both bike are used frequently/daily.

 

[metanewbie]

How fast can you ride with 16" with that gear ratio. I have similar gear ratio with Shimano Tiagra group set ready for my folding project. (have problem with dogs around the neighborhood). I can't wait to see how you install Qiroll Pro on this frame.

Btw yes Qiroll Pro need to be adjusted per-bike. Sometime takes time to find the 'sweet spot' during adjustment where i get right amount of grip contact and rolling resistance pressure during mechanical clutch adjustment. This why i prefer permanent installation than swapping about to avoid hassle especially if both bike are used frequently/daily.

If I recall, with the 16" folder I've gotten to 20 to 25+ (MPH) on a reasonable flat. It can accelerate a lot faster than my 700c. I can go up hills fairly well with it, too. I mainly want the Qiroll Pro for energy breaks on long rides, acceleration from stops, and hopefully a little boost up hills (with the grip tape.)

Looks like the QR swap method is not a great idea. I'll just get a second Pro at some point. I suppose they mainly offer a QR attachment to prevent theft.

 

[Tuono]

Got notice my flex will be delivered. Is the roller size the same as the Pro? This is the tape 3XL recomended off a previous post. Is the one to get or should I look elsewhere here in San Diego like a home depot? At $25, looks like I'm a little higher here.

Amazon.com

Also, has anyone changed, modified their switch so you don't have to hold it down to active it? Thinking a cut off with my brake type of mod.

 

[metanewbie]

Got notice my flex will be delivered. Is the roller size the same as the Pro? This is the tape 3XL recomended off a previous post. Is the one to get or should I look elsewhere here in San Diego like a home depot? At $25, looks like I'm a little higher here.

Amazon.com

Also, has anyone changed, modified their switch so you don't have to hold it down to active it? Thinking a cut off with my brake type of mod.

https://www.amazon.com/dp/B0006HVKLK/ — this one is $13.38.

 

[EMGX]

I hope that the friction tape works well for you and you post up your experiences one way or the other. I've mentioned before that it didn't work for me. I started with a generic product, then 3M Safety Walk and finally Gorilla brand. The grit on all three quickly wore off exposing the underlying tape with slippage. From what I gather from 3dxl's posts he presses the roller very hard on the tire while I followed the Qiroll instructions regarding pressure of the roller on the tire so that might have been the difference. If you check the GBoost product page for their friction drive you can see what they use instead, which looks to me like the sanding belt that I've used with good success so far. The grit on the sanding belts isn't just a surface layer like friction tape products, instead it is incorporated in resin.

Regarding the Qiroll roller size - since they sell only one version of replacement friction tape it would seem that the rollers for the Mute and Pro are the same circumference. Otherwise they would offer two different varieties, one for each version.

 

[Tuono]

Thanks! Ever seen anyone mess with the switch to keep it on, then deactivate through hitting the brakes?