Bicycle Mechanics - Handlebar stem dimension help needed.

I'm stripping a damaged 1994 Trek 2200 frame and adapting the components to a 2001 Giant TCR ONCE frame. I'm old school and anything other than quill type bar stems is new to me.

The Giant steering tube is 1" diameter and the bars I intend to use are 26mm. Being I'm not prone to opting for the most glamerous parts I've found a stem for that combo from Bike Nashbar and even a shim on eBay to fit my 26.2mm seat post to the 31.6 tube.

Anyway my questions: Is there basically a standard/recommended stem length for a properly fitted 53 c-c top tube (horrizontal center of seat post to center of steering tube is 55cm). On my mid 80's bikes w/ 53 top tubes I used a 90mm stem, but I'm thinking 80mm on this frame, what say you? Next question, I assume the stems have a standardized steering tube clamp height, is that correct, if so how much space does it cover? Last question, where can I find a headset cap for the 1" steering tube?

Thanks in advance, SKeown

threaded? is that 1" ID or OD , makes a difference in the stem, 1" OD the stem is 7/8"
stem is 1" when the fork is 9/8"

bodies of riders are not standardized.. cant type my way to fitting you from here.:notamused:

threaded? is that 1" ID or OD , makes a difference in the stem, 1" OD the stem is 7/8" stem is 1" when the fork is 9/8".:notamused:

It's 1" OD threadless tube.

The stock stem length for most early 90's road bikes with a 53cm is 100mm but you should be able to run a a stem 10mm shorter or longer just fine. Early 90's or newer bikes tend to run slightly longer stems than the old school tuff.