Rich. TBH I asked Devin Lenz to supply an XL (24.625 ETT) with a large seat tube height (19"). What arrived was by my reckoning a medium (23.4) with a large ST!
I didn't spot this sizing error till well after it was built and I was riding it for a while. But I'm so glad it worked out like it did, for the reasons above.
I still have my Niner SIR 9 *cough, for sale* which is 25.25. This is just too big for me now, and the TT is so high there's little seat post showing, and of course a compromising standover :oops:
I have had the Niner for over 2 years, and have enjoyed it, but having tried a smaller bike there's no going back. Oh, your lower back pain. I only suffer it when I get very tired on the bike, but that happened on all bikes, otherwise no problems.
One more thing – I run a 50mm stem & 2" risers! My Niners to start with had a flat bar with a 90 stem.
6' 2.5" 34.5 inseam (short legs)