On my British Eagle Touristique I fitted a 105 hub, c.2015, but for some reason I only put an 8 speed cassette on. This gives it 16 gears which is perfectly adequate for me out on the road and in fact give a beautiful, trouble-free shift with nice intervals.
Unfortunately my turbo trainer needs a nine speed cassette. I'm guessing moving to 9-speed is not worth the hassle just for the turbo.
I can go on using my tourer on the turbo, ok, but I have gone off triples.