Here's an interesting tidbit: the headset on the Nano is to the old and pretty much obsolete Japanese Industrial Standard (JIS). I decided to change mine out, as the stock headset is of extremely low quality, had non-standard wrench flats, and did not adjust well. Here's what this means:

1) the threading is the same as a standard ISO/Campy headset.

2) the fork crown race is sized 27.0. Standard size for one inch threaded is 26.4.

3) the headset cups are 30.0. Standard size for one inch threaded in 30.2.

In practice, this means you have limited options in replacing the headset. Velo Orange makes a JIS style headset; it is one of the few currently made. Maybe the only decent one. In addition, headset replacement on this bike will befuddle the average shop (seriously). The headtube on the 53 is too long for the headset press most shops use as a shop standard. A competent shop can mill out the headtube and the crown race to the standard sizes, but I'd make darn sure you have a competent shop to do it. I wouldn't trust your average shop on this job.

I had a box of old headset parts and cobbled together a very nice, NOS JIS headset from it and replaced my headset. I've also installed many a headset with no press, so I didn't have a hard time. I would have milled the head tube and crown race, but I only own the tool for the head tube now.

[RANT] Why Bikesdirect decided to make a new bike with an obsolete standard is beyond me. Probably made it a few cents cheaper. But it severely limits headset choices, and JIS headsets may not exist in a couple of years. There are a serious number of choices in the more standard sizing, from Chris King on down. This is just pure stupid-- it's going to cost the customer a lot extra should they choose to replace the crapola stock headset with something decent. Not everyone has a box of old NOS headset parts lying around. Sheesh. [/RANT]

Pics in the next couple of days; I'm also in the process of changing over my shifters fro Sora to 105, a nice upgrade. At this point, the only thing stock above the wheels on my Nano is the seatpost clamp. I may change that on principle.