This is an interesting thread. I haven't been riding long enough to do TT's but it's definitely a goal of mine eventually. I think I do pretty well on the flat courses and have pretty good endurance so maybe someday I'll be able to try one. So my question is - how do you know when you're ready? Is it realistic to go out and do the TT route on my own and see how fast I can go over a 10km ride or are the conditions/ situation just too different from the actual even to be able to compare? There are not many women my age who race around here so I can't even compare myself with others my age.

My fastest average speed on the flats so far was a 25km ride, averaging 29 km/h (about 18 mph?). (Would have been faster if we hadn't had to slow down on a hwy offramp/overpass ) Downside, I was drafting part of the way - upside, I was on my mountain bike. I have nothing more accurate to use as a comparison...

Anyway, thanks for posting the stats etc!