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I was dialling in my perfect gear range on my training bike recently. I worked out I hardly ever used the 50/12 so I'd drop it down to a 46. (running a 50/34 front with 12-25 rear). The experiment didn't work out as I found I did need the 50/12 more than I anticipated and the smaller double-shift jump threw out my shifting habits.
While I couldn't stick a 33 on the small ring the 46/34 combo worked perfectly as far as shifting. You can get an aftermarket 33T for the Ultegra/DA 11spd cranksets mind you but the Campagnolo BCD is just a bit bigger.
For anyone contemplating this watch out for the chaindrop ferrule on TA branded big chainrings - it is too long and digs into the crank arm. I had to remove it to fit the ring. I'm talking the 4-arm post 2015 Chorus.
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