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however, due to the fact that there are very few frames that size, and western people willing to pays lots of money for a big frame.... they really dont go for cheap.

Plus alot of Japanese (at least in my part of the country) dont ride Keirin frames, they ride Western Frames... Soma/Surly etc

I got a 56cm square Samson (with Columbus tubing) that was more than the 52 / 53 / 54cm frames in teh same shop. I had a little trouble getting a bigger frame, but big frames weren't any cheaper than smaller frames.