Originally Posted by
Darth_Firebolt
1) SIZE THE FRAME ON TOP TUBE LENGTH, NOT SEAT TUBE! The stock stem length on all of the 920 sizes is ridiculous. When you look at the geo chart, the 56 (what I normally ride) has a 100mm stem (what I normally ride) but the top tube is 57.8cm long. My 2012 Tricross Sport is 56cm square, and it came stock with a 100mm stem. It's comfortable. The 920 combination of long top tube, long stem, and ridiculously long TRP brake hoods makes this bike feel like a limo. I came into this purchase knowing these things, and also knowing the bars and brake/ shifters were going to be replaced almost immediately. If you're planning on buying a 920 and immediately setting out on a 3,000 mile tour; size the bike on top tube.
An even better thing to do is size according to stack/reach. Say you have a frame with a slack seat tube angle where you will want to use an inline seat post, the top tube is going to be longer than a frame
with a similar fit that has a "normal" 73 degree ST angle. Or the other way around, you could end up with a bike that feels like a limo, even though it has the right top tube length, if it has a steeper seat tube angle where you need more set back on your seat post.