I've thought about this as well. I'm currently running a 17/45 and have toyed with the idea of going to a 17/43???
If I were to do it again, I think perhaps a 16/43 (2.69) may be the sweet spot to start. Easier and cheaper to change the front if you want to make further changes, dropping all the way down to a 40 rear seems extreme to me, and a 43 rear leaves you options of adjusting the front to a 15, 16, or 17?
Is a 14 front available, or too small IDK...
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