Getting away from all the willy waving
I did the dales cycleway on my crossbike and I’m not that fit so I knew I wouldn’t be able to do it with a 50/34 and 25 on the back carrying all my camping gear.
I used a MTB cassette and an old LX mech with a J-TEK shift mate 2 to allow me to use the 10 speed shifters with the 9 speed cassette and after a little adjusting it worked a treat. You get them from SJS cycles on-line there about 30 quid.