I've been looking to go 406 for a while. Main thing stopping me is lack of a good local supplier, and the need to maintain the 9T Capreo/Sunrace rear cog on my 10sp touring. I have a disk MK3 so that simplifies the braking aspects. Going back to 11T rear cog would defeat the object, I'm already spending too much time in the last 3 cogs even with a 56T front ring.

Availability of a decent set of 406 disc rims in the UK seems limited which makes the best - if expensive alternative looking at someone like SMC or a random Chinese supplier from Ali...,