If you've got the necessary reach with your brake pads, you're better off going the 700C route for all the reasons stated by Repechage. However, if 27" is your only option, I'd suggest the Sun CR-18, which is still made in a 27" version. I.m not sute about the weight, but it is aluminum and of box-section/double wall construction for extra durability. About a month ago, I installed one for a 300 lb riding who flat spotting his normal U-section Arayas. So far, there has been no reported problems.