Originally Posted by
chaadster
Okay, but what about those funky "stem reach" numbers you came up with, 74.3 and 76.4? Obviously you know stem extension is almost exclusively in whole 10mm increments-- you noted you have a 100mm-- so what are you measuring to get those numbers?
I used an online calculator which accounts for stem angle, stack height, etc... so it's effective reach:
Bike Stem Calculator - Brightspoke
I currently have a 90mm. It looks like with a 100mm 17 degree stem I ought to be able to get a little more reach and eliminate some spacers because I'll effectively have the same height.