Just completed converting my new Brompton to e-assist.




My previous M3L was converted as well but this is a new lighter 200W assist motor that only weighs 1.4kg. This brings the total carry weight (including motor) of my Ti Brompton to the same as a stock steel M3L i.e. 11.5kg.

Older Tongxin Nano (2.1kg) and new Tongxin Goldant (1.4kg) motors side by side. The new motor is only 100mm diameter and looks barely larger than an dynamo. Both motors are around 80mm wide so you have to spread the 75mm wide Brompton forks a little, to slot it in.




All the electronics and a smaller 1kg battery (good for 5-8 miles depending on terrain) are carried in the C Bag with an umbilical to connect it to the bike.









My last conversion was throttle only whereas this one is pedelec (you have to turn the pedals to engage the motor). I tend to leave it off until I hit a head wind or an incline/hill. The Union Jack stickers reflect the current Jubilee celebrations in the UK!





If you are interested in the build then full details are documented here

I have been commuting daily for the last 2 & 1/2 years, 3600 miles total since 2009 on the original setup.

Regards

Jerry