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Couldn't find a 15 from Brompton that fit the Shimano splines, so it's still got the 16. I'm not about to shell out on a cassette just to pull one sprocket off, so I'll revisit that when my road bike needs a new cassette. But I did replace the 12 with the 13 which reduces the main gear from 74 to 69, same as my fixed.
bq
So now you are running a 15T and 13T on your 2-speed?