20" front wheel hub motor, gearing questions !
- Thread starter eHomer
- Start date
Sorry my mistake, the BMS website was down when I tried it, so I had to guess based on prices I checked earlier in the week.
Personally, I no longer deal with any trader on eBay with less than 99% feedback. Every time I have broken that rule I have been stung.
Also, I don't know the quality of that motor (not saying it's bad, just don't know what it is). The BPM is a well proven and respected motor that performs really well.
If it were me, I'd be sticking with the BPM.
D
Deleted member 4366
Guest
With BMSBattery, you'll have to make it clear that absolutely nothing will do except 328 rpm - Code 10 or lower. A guy on ES just got one. He said he ordered 328 rpm, and got a code 14. That would be a disaster in a 20" wheel. I don't know why you don't go with a rear cassette motor. It'll be a lot better.
No problem Mike, all suggestions gratefully accepted. I was just worried in case I'd done something wrong to cause the shipping to be so much higher.
d8veh, yes I can see your point, a 26" rear wheel would remove the danger of ending up with a 201rpm motor in a 20" rim.
It makes better sense putting the power on the back as well, it was just that I could not then try electrifying the Hase trike with the same wheel.
In view of the high shipping costs and the ever increasing customs and handling charges, I may just hang on for an EU ebay seller (like the German or French ones).
d8veh, yes I can see your point, a 26" rear wheel would remove the danger of ending up with a 201rpm motor in a 20" rim.
It makes better sense putting the power on the back as well, it was just that I could not then try electrifying the Hase trike with the same wheel.
In view of the high shipping costs and the ever increasing customs and handling charges, I may just hang on for an EU ebay seller (like the German or French ones).
Have you considered one of these. They are popular in recumbent bike. No power monsters but more than enough assistance to make pedaling easy.
Nice freewheel light and almost silent. Tongxiin 35V, 250W, 290RPM (easily get you to 18mph). You can buy them direct from China with controller, display panel etc for around £200 (suggest you buy two as shipping is the same so brings cost of each unit down to about £100 for just the motor or £150 with other bits). You can just buy the motors and then buy a programable controller to set you preffered settings.
Meets all your requirements of less drag, quiet, easy to remove etc. The one shown is the narrow 80mm one with 28H. They normally come in 100mm spacing with 36 flange holes.
This is their web site.
http://www.h9.com.cn/index.asp
Regards
Jerry
Coming back on Jerry's suggestion, I've found a UK based ebay seller who has complete 20" front wheels with a very similar motor at £215 delivered, with no tax or duty to pay. They even have the controller etc., everything except the battery and charger, which I don't need.
Electric bike kit for 20" folding bikes 36v 250w without battery 80mm narrow hub | eBay
This photo from that listing shows the motor markings:
I notice the rpm is shown as 230, so way below the 290 on Jerry's photo, but higher than the 201 normally found on 26" wheels.
The motor is also the "narrow" 80mm, and my dropouts are 100mm. Would I be able to put a 10mm spacer each side ? I'm trying to find a drawing of that exact hub to see if the overall length of the shaft would be enough ? Any problems with bending maybe ?
Can anyone point me to a web page that might show that motor spec in greater detail ?
Lastly, the other photos in that ebay listing show the connections on the controller, and there appear to be no hall effect sensors, so would I be right in assuming the motor is sensor-less ?
Would a sensorless motor work with a hall sensor equipped controller with the sensor wires not connected ?
Thank again to everyone for all the help on this, the replies are much appreciated.
D
Deleted member 4366
Guest
Yep its got the wrong RPM needs to be at least 260RPM or 290RPM like the ones I just got for 16-20" rims.
He also does them for Brompton/16" wheels which would be even slower and he has the incorrect smaller 305 rather than 349 rim.
To answer your questions no it would not work with a controller with hall sensors. Additionally these motors should not really be pushed much past 12 amps, (though some people seem to successfully over volt them), so I use a programmable controller with them.
I have put them in a 100mm fork spacing using spacers and tightening them up to maybe 90mm spacing. Not a lot of room on the nuts but it can be done providing of course your forks are steel.
The larger Tongxins are excellent for light assistance providing you treat them well and don't expect to power on with throttle from a standing start i.e. pedal first.
web site here http://www.h9.com.cn
If you are interested, ordering is easy in that communication is good, they send pics and ship well. Can take a little while for them to manufacture (4-6 weeks) but this last last order for two 290RPM motors was ready and shipped to my door within ten days
PS strange link is not working now ?
You can always email Ms Anna on sales@h9.com.cn. Tell her you want a front 36v, 290RPM, 36H ?, 100mm spacing for V brakes motor. They will also set you up with a controller with pedelec, throttle or both whatever you prefer.
Regards
Jerry
He also does them for Brompton/16" wheels which would be even slower and he has the incorrect smaller 305 rather than 349 rim.
To answer your questions no it would not work with a controller with hall sensors. Additionally these motors should not really be pushed much past 12 amps, (though some people seem to successfully over volt them), so I use a programmable controller with them.
I have put them in a 100mm fork spacing using spacers and tightening them up to maybe 90mm spacing. Not a lot of room on the nuts but it can be done providing of course your forks are steel.
The larger Tongxins are excellent for light assistance providing you treat them well and don't expect to power on with throttle from a standing start i.e. pedal first.
web site here http://www.h9.com.cn
If you are interested, ordering is easy in that communication is good, they send pics and ship well. Can take a little while for them to manufacture (4-6 weeks) but this last last order for two 290RPM motors was ready and shipped to my door within ten days
PS strange link is not working now ?
You can always email Ms Anna on sales@h9.com.cn. Tell her you want a front 36v, 290RPM, 36H ?, 100mm spacing for V brakes motor. They will also set you up with a controller with pedelec, throttle or both whatever you prefer.
Regards
Jerry
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This link provides some more detail though is quite old now
http://www.tongxin.net.cn/en/parameter.htm
Jerry
http://www.tongxin.net.cn/en/parameter.htm
Jerry
Blast ! I was afraid of that....
13 or 14 mph, that would take me back to my Powabyke days, when it was quicker to pedal.
Thanks for the answers on the other points, I think if I go for a 20" front wheel I'll stay with a 100mm wide motor then, I don't want to bend the forks because the idea is to be able to sometmes change it back to the unpowered wheel.
Yes, I can't get anything on the link now either, or even just the top level http://www.h9.com/
Thanks for the detail link Jerry.
13 or 14 mph, that would take me back to my Powabyke days, when it was quicker to pedal.
Thanks for the answers on the other points, I think if I go for a 20" front wheel I'll stay with a 100mm wide motor then, I don't want to bend the forks because the idea is to be able to sometmes change it back to the unpowered wheel.
Yes, I can't get anything on the link now either, or even just the top level http://www.h9.com/
Thanks for the detail link Jerry.
Not 350W but a good fit for your forks - does not come standard with a weatherproof connector but can be fitted at extra cost - you just need to tell Jane you need the fastest speed motor.
She may even be able to create a complete kit for your needs if you tell her your requirements.
36v 16",20",26",700C electric bike BLDC front wheel motor QMWB-in Electric Bicycle Motor from Sports & Entertainment on Aliexpress.com
She may even be able to create a complete kit for your needs if you tell her your requirements.
36v 16",20",26",700C electric bike BLDC front wheel motor QMWB-in Electric Bicycle Motor from Sports & Entertainment on Aliexpress.com
That looks ideal for me, £85 delivered, so the additional customs and vat would not be too high either. It's not too clear whether it includes lacing into the wheel as well though. I've sent a question to Jane to find out.
I've not used Aliexpress before, are they safe ? A Google search shows quite a lot of bad feedback on that system. As I understand the web page, they don't pass the money on to the seller until the recipient gets the goods, is that really true ?
Also, I see they don't take Paypal, so I'd have to give my credit card details out, which I try hard not to !
Well they certainly run a very speedy reply service !
The price is for the hub only, no spokes, no rim.
I still don't know the cost of having a local bike shop lace one up into a 20" rim, or whether the correct specialist spokes may be difficult to get, and whether they would know the correct crossover layout.
The price is for the hub only, no spokes, no rim.
I still don't know the cost of having a local bike shop lace one up into a 20" rim, or whether the correct specialist spokes may be difficult to get, and whether they would know the correct crossover layout.
The other problem will be that you have to file out the fork slot to accommodate the 10mm flat on the motor shaft and deepen it to allow for the overall 12mm diameter which means you will not be able easily to use the original wheel should you want to convert back at a later time.
I just googled - Bicycle wheel building Norfolk and it returned this shop and a few others.
Madgetts Cycles :: The Shop
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Problem is not all wheel builders will take on a heavy hub motor laced into a front wheel.
Jerry
Jerry
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