I’m currently running 172.5 Ultegra, and would like to try 167.5 (realistically it might end up being 165, as 167.5s seem rare) on my existing bike (in advance of speccing them on a new one).
What is the cheapest and easiest way to do this? I don’t fancy dropping £200 ish on a new ultegra set (in case the experiment doesn’t work), and 165mm second hand in good condition are pretty hard to find.
Rotor or Praxis seem to mandate a new bb, so I’m a bit stuck at the mo.
Any suggestions welcome.