New electrical conversion kit for Bromptons (Boost) (1 Viewer)

[Ridgeway]

Seems much lighter than the Brommie one and less intrusive:

First look | Boost’s new Brompton ebike conversion kit promises lightweight electrification

Conversion kit uses rear-hub motor and weighs 2.5kg

www.bikeradar.com

£600 for the early bird kits will certainly appeal to quite a few

 

[Guigsy]

It looks interesting. Leaving the carry block and handlebars free is a massive gain over the Brompton official version and Swytch kit. It'll fold without the faff too.

But it loses the Sturmey Archer 3 speed hub. Maybe that doesn't matter as much of you've got a motor to assist? Will it work with the new 4 speed derailleur?

Also, how does it work without a external cadence or strain sensor? Can it sense load through the sprockets? If so, I've not seen that done before. It might be really smart, but it could also be really clunky.

 

[ontheroadagain]

If you have a 3 speed what happens to the hub gears?

Edit - Guigsy beat me to it re the gears.

 

[Ridgeway]

I assume only the derailleur continues to be operable, assuming your bike has one.

 

[Guigsy]

I assume only the derailleur continues to be operable, assuming your bike has one.

If it fits the P-Line 4 speed, I'd be ok I think.

P Line Urban

Folding Bikes, Fold Up City Bicycles, Mens & Ladies Folding Road Bikes | Brompton Bikes

www.brompton.com

^{_{Subscribers  do not see these advertisements}}

 

[68c]

It looks interesting. Leaving the carry block and handlebars free is a massive gain over the Brompton official version and Swytch kit. It'll fold without the faff too.

But it loses the Sturmey Archer 3 speed hub. Maybe that doesn't matter as much of you've got a motor to assist? Will it work with the new 4 speed derailleur?

Also, how does it work without a external cadence or strain sensor? Can it sense load through the sprockets? If so, I've not seen that done before. It might be really smart, but it could also be really clunky.

Most after market kits use a ring of magnets on the crank with a small sensor. As you pedal it detects the rotation and starts up the power, comes in smoothly with no jerking. A thumb throttle will take you up to a walking pace which makes pulling away easier or pushing the bike up steep hills. We have converted two bikes using the Yose Power kits. Where to put the battery is always a conundrum, on the down tube will not fit with a ladies bike. In a special two layer bike rack which moves the weight high and to the rear, then the sidestand does not work so well.

 

[paddymcc]

Haven't quite got to the point where I need electric assistance on the Brompton but can see it being practical when I get to that point. 2.5kg is impressive and 30km range would be fine for how I would use it with the van.