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More so than with the 56, which will just be a sit up and beg basically?
Ehhhh, this is hard. I've emailed Genesis to ask their advice.
Thanks (again) Ed. I'm leaning towards 54 for flexibility. I can always make the reach longer and drop bigger with a 54. I can't make a 56 any smaller if I find it too upright. But then maybe upright is what this bike should be.
Unfortunately, I have no real way of test riding both of them.
dglshrn-
Comparing the stack and reach to the current bike you're riding is a good way of finding out.
54cm sound like a good size to go for, you probably won't even need to change the stem length.
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If in doubt go for the 54. Leave a bit of steerer until you're dialed for fit, then leave a little above the stem just in case... everyone is happy.
edscoble
miro_o
The 54cm is 5mm shorter than the 56cm*, It also have a similar stack as a typical 56cm classic geo bicycle, so you get a choice of two sizing, sit up and beg, or low and, well, beg.
*lots of handlebar come in various reach, says 65mm reach (Pro Vibe Compact), 75mm (Salsa Cowbell), 88mm (Zipp SL-88).