WTB 53cm, 54cm, 55cm 650c Tri Frame

Don't have one to get rid of, but here's a possible alternative to used: Look on ebay for a Klein Aeolus. This is an "old school" tri bike frame, very stiff and fast, and only comes compatible with 650c wheels. There are none up for sale now, but periodically you'll see new ones on ebay, often going for $200 or less. My friend had one, and loaned it to me for my first tri. Shortly thereafter, he sold it, and he's regretted that ever since.

Here's a recent completed sale of a 55cm frameset: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&rd=1&item=320193789328&ssPageName=STRK:MEWA:IT&ih=011

McFuzz has one of these as his tribike so you might want to ask him about it. He bought his on Ebay, as well.

what it is we call new old stock... we are one of the biggest retailers for cervelo and occasionally they will find frames in there warehouse such as the 2004 p3 sl and the dual then we blow them out. in the case of the cervelo one it is new but circa 2002 it is a great bike but the reason i didn't mention it is because it is 700c ... good luck in your quest and if there is anything i can help you with let me know... i always like to help my bt friends with deals as i can..

edde

Sweet bike.  Not sure of the entire history of mine.  It was listed as a 54, but feels substantially longer than that (I haven't taken a tape measure to mine). 

Did a google search, and Klein had some proprietary headset/bb setups (which may explain why frames are cheap) so reusing your existing parts may not be trouble-free. 

If you're willing to live with unsightly "gaps" you might consider a standard frame with long-reach brake calipers for your 650C wheels.  (Not sure about handling issues with this.)