Originally Posted by
Sy Reene
FWIW, Assuming a 2x crank (?) an 11-XX cassette makes the 12 and 13 tooth cogs that more likely to be usable if cross-chaining is an issue with your setup when in the small crankring. A cassette that starts with a 13-tooth, means that your highest gear when in the small front ring probably starts with the 15-tooth cog.
Small ring x small cog is usually usable without rub when you properly adjust front derailleur trim.
When you have a narrower than normal crank you can add 0.5mm shims made by Wheels Manufacturing, LeTour, and Origin 8.
You pay about a 1% efficiency penalty for doing that instead of moving to the big ring and might find the noise annoying but aren't going to hurt anything.
https://www.ceramicspeed.com/media/3...ize-report.pdf
Big x big can lead to uncommanded shifts to the small ring as the teeth wear down which can cause crashes when you're standing at the time.