Hello

[Kevin A]

Hello, I am a keen cargo cyclist amongst other cycles.
Currently looking to install electric assist on my Xtracycle with which I tow a Surly long trailer. Carrying upwards of 100kg.
I am unsure whether I need a hub motor or a bb mounted motor.
Chiefly because to get up any hill I need to use the 28t inner chainring.
I wonder if anyone on here has experience of cargo bikes and towing large weights ??
Any advice appreciated.
Thanks
Kevin

 

[tommie]

100kg, plus your own weight, plus bike, plus motor, battery etc...
i can`t see any uk legal spec hub or mid motor being able to cope with all that weight climbing hills.

You may have to look at the Bafang BBS range. This setup should be man enough though. https://www.ebay.co.uk/itm/Bafang-BBSHD-1500w-Electric-Bike-Conversion-68-73mm-Battery-52v-17-5Ah-UK-STOCK5/272946927973?hash=item3f8ce79965:g:rvUAAOSwnCFaC0Dc

 

[Kevin A]

Thanks tommie. Point taken. I am keen to retain triple chainwheel set though. Is there no way ??

 

[tommie]

You`ll find with that torque you really won`t need any more than 8 gears, in fact i find myself double changing a lot of the time

 

[Nealh]

You`ll find with that torque you really won`t need any more than 8 gears, in fact i find myself double changing a lot of the time

WIth single chain ring and towing 100kg he has option of playing with chain ring size down to 38/42 and having a bigger range on the rear could go 36/11 or a bit a taller on low gear to 40/42 even.

 

[anotherkiwi]

I have a double chainring on the GSM: 42-32. If you use a wide range cassette you will be able to tow 100kg. Stopping it will be another story...

A "250 W" BPM hub motor with a 48V battery and a 25A controller would be a better solution. You keep your triple chainring and when you need it you have a 1000W helping hand in the rear wheel...