I'm 5' 10" and bought a new 2015 Specialized Sirrus Elite the first of January in a size large from a LBS.

I rode a medium and a large prior to purchase in the parking lot for about 5 - 10 minutes each.

I ended up getting the large and am regretting it now...not sure why I got the large...probably an ego-driven decision.

It's too stretched for me. I've played with adjustable stems, high rise bars, stem risers...

Get a medium.

You can't tell anything from a bike riding it 5-10 minutes in a parking lot.

It's when I do my local 20 mile TT's that I realized I had made a mistake.

Great bike...just too big...~200 miles on it in a month.


Rod
Oriental, NC