Frames are generally measured by multiplying your inseam by .67, which in your case would be .67 X 75 = 50.25. cm.

Make sure that your inseam has been measured correctly. The industry standard is to have you in bike shorts or something tight and in sock feet. place your back to a wall and with your feet a couple of inches apart jam a book tight up against your crotch. Have an assistant measure from the floor to the top of the book.

If your inseam measurement is correct, it would seem that you are a long torso/shorter leg individual, so you have to be careful of not purchasing a bike with too short a top tube.

Different manufacturers measure their bikes differently but if you were purchasing a bike that I'm familiar with like a Cervelo P2K I would guess that a 51 cm frame would fit you quite well. I'm not familiar with the other bikes that you have mentioned.

Hope this helps a little and hope that you are able to come home soon.

Thanks for your feedback. I did the measurements as you stated only without bike shorts since I don't have any here (used running shorts instead). My flight surgeon and I took the measurements four times and then took the averages. I also measured lower tibia, femur, chest width and many other items because several of the programs called for these measurements, both sitting and standing. I also weigh about 155 lbs and have about average to slightly below average flexibility. I am working on the later. I would agree that my body type is short in leg and a little long in torso.

From what I have read I would best fit on a bike of 50 cm c-t or 51 cm c-t and a top tube of about 53-54 cm. Does this seem right to you for both a tri-bike and a road bike (see later comment regarding cervelo)? If the TT was a little off, I've read I can adjust that by getting a longer or shorter stem. Is this true as well? Are there limits to how far I should go with stems?

I've read that QR builds their bikes with the TT a little shorter for longer legged bodies like females. I've looked at the specs of the Pican-Ti but I can't make sense of them due to the varied geometry.

The specs on the Saber look about right but a little short in TT. The specs on a Tachyon might fit but I read some threads from this forum that says that the frame is really designed for a super longer torso. I just don't see myself like that but maybe I am.

I've read nothing but good stuff on the P2K (Tom Demerly writes some great reviews on his bikesport.com web site; Dan also has great things to say about Cervelo) but I am pretty set on getting a titanium bike for the reason of durability above all else. Interestingly I noticed that the TT on a Cervelo P2K, 51 cm bike set at 78 deg is 51 cm and at 75 deg is 54 cm.

Does this mean I would fit on a tri bike (78 deg) 51 cm c-t and a TT of 51 cm despite my longer torso?

Thanks for your feedback. Believe it or not the internet is the majority or our entertainment over here. Obviously training in this environment is challenging.