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Yeah, now and then I'll top out on a fast descent but not often.
At the moment I'm running 50/34 with 11-32T but I'd like something more like 48/32 w/ 11-36T to cover steep climbs when I'm totally fucked (or injured).
My plan was to keep chainset as is and fit Wolftooth and use SRAM 11-36T cassette. I'm not sure if a 1x will give me low enough gearing, at least not without putting big jumps in the 'flat land' gears, but I've not worked it out.
Do you need the top end though on an ultra? Do you actually pedal on a downhill?