Hey Scrod,
Sorry if you've answered these types of questions a million time. Thought I'd bug you with more.. haha
Anyways, I'm in the process of building my Leader 725 and I'm planning on getting SRAM Omniums. I'm just deciding on which size would be optimal for me.. I've searched around a bit and used an online calculator and found that with my inseam: 32", it would be good to get a 167.5mm crank length? I've also found that for my size its okay to go with the 170mm. Could you chime in on this? I have a 55cm bike frame. Thanks again in advance.
There's no actual way to answer this question. Two people with the same inseam and proportions could easily use two different length crank arms. While some of it has to do with math and numbers, a lot of it also has to do with your ability, riding style and what you are comfortable with.
I used 170mm for a long time until I recently figured out that 165mm feels much better.