OK...on my Raleigh mixte there is currently a Sturmey Archer stem 22.2 x 25.6. I understand those measurements. 'Assuming' you measure height from the pointy end to the top of the column, mine measures at 145mm with a 90mm extension (approx - I don't have calipers). I would like the stem to be taller. I've looked at the Nitto technomics - they all have 225mm columns with the extensions being different lengths. Am I thinking correctly that the extension lengthens/shortens the reach? How will I ever figure out which one I want until the entire bike is built up with the seat adjusted correctly, etc.
Any help getting my brain around this would be greatly appreciated.