I currently have an SRAM PG970 12-26 on my bike. It's a 9 speed in case that matters.
I want to have a second cassette to swap out instead of having to clean the one on the bike. The idea here being I would always have one clean and ready to go.
Could I swap an SRAM PG970 11-23 without making any other changes to the bike?
Could I go with an Ultegra 9 speed cassette, again, without making any modifications?
Could I go with an 11-34 cassette?