Something I want to try
single chainring, 44t
cassette 10-38
With this setup,
a rider with an FTP around 3.6 w/kg
should be able to handle pretty much anything
No front derailleur means lower cost + no chain drops + lighter weight too
so 13-speed is definitely going to become the standard
Given how things are going, I'll ride 12-speed for a few more years
and start peeking over at it eventually