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Short Brompton chain tensioner nut for 3 Speed
Technical notes:
This is the shorter 16.9mm nut used on old steel shell (2004 and before) hubs - using the SA I gear indicator chain
Current hubs (BSR and BWR) use a 19.5mm nut and use the SA II gear indicator chain
Chain tensioner / gear indicator nut:
(This is the nut with a hole in the side)
Earlier hubs 2004 and before (normally with steel shell) use this nut.
The difference between this and the later alloy shell nut may be small - but it is essential to use the right one.
