I've made other posts as I try to wrap my head around this. So the 4-speed P/T lines, they are just using a wider range chain pusher? So basically, this, on a C line would function the same? Yes, with the 4 cogs on the rear hub, new tensioner and cable and shifter.

So a rear derailluer isn't needed. Will this be basically how Brompton will make the 4-speed C Line that is coming?

by ando_da_pando

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  1. No it’s a different system altogether. No chain pusher anymore, it’s a small derailleur. Look at the rear triangle of the P/T/ new C line closely. Brompton is switching all bikes to the “advanced” rear triangle. Probably just the A line will keep using the old triangle.

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