The adapter can be had for $8, 1/4 of the price of Litepro, it is heavier than Litepro, 74 vs 54g, and cruder. By being more bulky it is stiffer than Litepro and flexes less when the shift cable is tensioned. Also it is easier on the cable, see the photos. When using Litepro on Brompton, the cable gets awkwardly pinched to the seat tube on its way to the derailleur arm. Because the adapter is cruder, it is harder to adjust to arrive at best shifting than Litepro.
Not sure what you mean. The LitePro K clamp doesn't flex when I pull the derailleur cable:
Ideally, the cable should head straight for the derailleur, but I haven't had any problem in the almost two years I've been using this setup.
Also, I notice Ben Cooper now sells the
Alfine 11 for £1,550: If I had to get a new Brompton today, I wouldn't bother with adding a doublechainring to the six-speeder and juggle with three shifters, as the Alfine 11 provides about the same
gear inches.