I live in Iidabashi. Pretty much the center of Tokyo. About 2 mins from the Palace.
Trust me, I've been here for a year and a half and I know that it is really hard to find anything, not only bicycle parts if you're slightly taller than the average Japanese.

To give you an idea. T-shirt sizes in Japan. S, M, L, LL.
LL is equivalent to a US size M.
Shoe size 44 or US 10, is considered huge.
Try to find a store that carries frames in sized for people over 175cm. Not a chance! One out of a 100 customers might buy it. They just don't carry it. I had to order my Cannondale, too. The largest they had in the store was size M.

But yeah, they must have a lot of nice bicycle stores. I haven't discovered many yet. But there are just so many people riding bikes here, those stores gotta be somewhere.
I've only found, two really good ones. W-BASE and ProTech in Harajuku and Omotesando. W-BASE is pretty cool.

Ay, if you get me a WBASE shirt,
I'll get ya something comprable in price here in the states you might be needin.
PM and I can send my trade list as well.

When I was a kid we had bicycle safety courses and proper braking technique was something we were taught early on... my daughters are 9 and 11 and almost never use their rear brakes and can do full on stops.

These braking skills were also pre-requisite for them to be able to come and ride on the road and bike paths with me.

That's a very good idea. In fact, I remember, when I bought my Cannondale Bad Boy with front and rear brakes, the store even told me to be careful with the front brake. Not to pull it when I am at high speed. Very interesting now after reading sheldon brown's site. I am trying that technique today.

Well you can pull it at any speed, just how you pull it is important. Even on my geared bike i used the front brake on fast descents and pretty much ignored the rear. You can just feel the power of the front brake when you use it, the difference is obvious.