Hi there Nevtrik
We have bought some of our bikes online. I recommend you write down what you want from a bike and then from your "wish-list" find that type of bike online. Research the bikes on your short-list specifically... sometimes there will be recommendations for rider weight and rider height.
You could also email the manufacturors or retailers of the bikes you like best and tell them you are contemplating purchasing one of this style, and what do they recommend regarding frame size and your height.
If you get abroad, Tulip's idea is a very sensible one too. Try bikes out whenever you get he opportunity and if you can, note the frame size (usually listed at the base of the tube that is topped by the seat.
Good luck in your shopping



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