Brompton Internal gear hub indicator chain for Sturmey with alloy shell
Indicator chain for 3 speed hubs on Bromptons.
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Modern (i.e. those made after 2004 with an alloy shell) Sturmey-Archer 3-speed internal gear hubs require this chain and piston in order to engage each gear in the hub. Brompton 3-speeds and 6-speeds will require this part.