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in general is it best to size down or up?
Personally, I'd rather go for the longer frame, especially if you're planning on racing it. At 6'1", you're unlikely to want a super-low front end, so the only thing to worry about is stand-over height. Not something that should worry you too much after riding a CX bike :-)
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You have to look at the specific geo to make an informed decision or face an expensive mistake. The 2 most important measures are effective top tube and reach.
Not knowing knowing if you are a gibbon or leggy doesn't help but the effective top tube on the 21.5 is mahoosive and very unlikely to fit you with a normal 70mm - 80mm stem. I ride a 627mm ETT with an 80mm stem at 6' (and that's probably a bit longer than normal) so you are unlikely to want to go above the 19.5" which has an ETT of 639 and will probably allow you to run a normal stem and bars.
Reach looks long too at 443 for the the 19.5" so the 21.5 must be designed for giants
ps looks a nice bike
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I'm the same height as you, ride a 57cm cross frame (with a 120mm stem) and a 19.5" (effective 24.4") xc frame (with a 100mm stem).
I think I'm also probably between sizes and had the same sizing issue as you a month ago, but glad I went for the shorter frame and a longer stem. I tried wider bars and a short stem but didn't really get it, just doesn't feel conductive to riding bikes fast to me.
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BareNecessities
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Jon.
@who22
Currently looking at a Trek Superfly 7 for XC racing, a bit late in the year now, but more for after this years CX season and long days out in the woods.
Anybody have experience with one?
I'm 6ft 1" so could fit between a 19.5 and 21.5 frame, in general is it best to size down or up?