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The conversions rely on splaying the forks. It works but it’s a bodge, and voids your warranty.
The Brompton version is actually relatively good value imo, and it’s perfectly integrated.
TM-
@TM the Swytch lot have had a special 74mm narrow hub and wheel made just for their Brompton kit, no filing or stretching needed, drops straight into the fork.
Weight wise its a little less for this kit over the Brompton, and because it comes as a built wheel it means it's possible to switch out and have the Brompton back as 100% stock.
The official one meant you are always lumped with the weight penalty of the hub motor (and cables/internals) even if you took the battery unit off.Apparently their test units are out with press this week, so should start seeing some impressions.
Drokk
In other news; the Mrs and I just put our orders in for a pair of M6Ls
Mine in raw lacquer and hers in stardust black:
(oooh shiny)
Still tempted by the electric idea, but we might go for the Swytch Brompton kits (the official e-bromp is just too $$$) I'm popping along to their workshop to try one out later this week hopefully:
https://www.swytchbike.com/