I'm aiming to upgrade my Shimano Sora/Tiagra mishmash 9 speed groupset and basic wheelset. I'm happy with my frameset (GT GTR Series 3 2010). I'm looking at the Ultegra 11 speed groupset and the Shimano RS81 C24 wheelset (11 speed compatible).
I would like to keep my old wheels as winter/spares/turbo trainer (back wheel). This would mean changing the cassette to 11 speed and, if I'm thinking correctly, the Tiagra 9 speed freehub to a Shimano 11 speed compatible freehub.
I've been looking at YouTube and Google and it looks fairly straightforward to replace the freehub itself.
Looking into the compatibility of changing from 9 speed to 11 speed, that also looks doable.
Has anyone here done this? Does anyone know if I'm ust talking out of my behind?