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Finding something to fit in a shop would be beyond shocking :) it would be like winning the lottery jackpot. Your best bet would be to bring a bike with you. Second, find some high end bike hire service (high end because more likely to have larger bikes for travellers, rather than mama chari types that come in a single small size). Third, if you're in Tokyo perhaps see if anyone has something to sell here. Fourth, if you're near Ashikaga you can buy my bike (a mere 61cm so too small for giants).
Does anyone have experience with buying a second hand bike in Japan. Not to export but to use while I'm there. Are the prices for bikes similar to Europe? Would it be hard to find a big size (I'm 6'5). Cheers!