Brompton owners

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neu in reply to @JurekB

Cheers very helpful

I would have got the minimod, but I wanted a lower gear and I know that 19t just fits.

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JurekB in reply to @neu

This may seem a daft question - but the sprockets you bought - they are for a 10 speed cassette, aren't they.

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neu in reply to @JurekB

Well the 19t is ultegra 10 speed, and the 12t is 105 11 speed.

I got the 105 because it was the only 12t cog which had the recess I believed was necessary to fit the circlip. It also matches the appearance of the minimod 12t.

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