Sturmey Archer gear indicator chain MK IIII / IV
Compatible hubs include:
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Sturmey archer part code / sales no: HSA316 - Gear Indicator MK IV or IIII
This can be identified by SA IIII or just 4 notches carved into the the spindle (you will need to remove the indicator chain to check what yours says) - you will also need to remove the dirt covering the marking on your existing indicator chain
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