Originally Posted by
leed
27" wheels are slightly larger than 700C wheels, so if you're unlucky, chances are you'll need to get long reach calipers (Tektro makes these) Other than that, everything should be good to go. You can also look for a 27 fixed rear, which is attainable.
For example..
Here
Tthe 27" sizing is no longer standard and decent tires are few and far between. If you are going to invest in a decent set of wheels, going 700c is the way to go.