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@LongAndWinding
Awesome, thanks!
I've managed to reach a similar conclusion: 60T/22T; 66.65 GI; 390.32 CS. Slightly higher GI though. I hadn't thought of the option to change rear sprocket if I wanted to.
Took me a while last night to replicate what the bike builder had suggested, I wanted to be sure it was calculated with the right wheel size (which I figured was 650c = 26 x 1.25 = 1950).
I shall go with that thanks!