what frame size????

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I want to buy a Giant Yukon mtb bike. I m going to use it both on and off road (both pavement and cros-country). I need help on the frame size. Got really confused when I checked on the internet about all those frame size theories. Im 182 cm (5.11 ft) tall. Should I go for a 19 or 21 inch bike? Also got confused because in my country the Giant Yukon comes in sizes of s,m,l,xl. Really confusing guys.
Please help..............!!!!!!:eek::eek::eek::eek::eek:

Go for the 19" with the shorter top tube if road riding. ;)

See "Geometry" on this page: http://www.giant-bicycles.com/en-AU/bikes/mountain/169/22446/

Go for the 19" with the shorter top tube if road riding. ;)

See "Geometry" on this page: http://www.giant-bicycles.com/en-AU/bikes/mountain/169/22446/

I'm 178cm and chose the 19" or 19.5" can't remember, My brother is like 185 and has a 21". I could have chosen the 17" or 17.5" but I felt the bigger bike more comfortable.
If you can test them it will be easier to make the decision.

I'm 178cm and chose the 19" or 19.5" can't remember, My brother is like 185 and has a 21". I could have chosen the 17" or 17.5" but I felt the bigger bike more comfortable.
If you can test them it will be easier to make the decision.

Size M (19") for riders between 5'8" to 5'11". If closer to 6', the L (21") frame. Because GIANT (and many other) MTBs have a steeply sloping downtube, the old 'rule of thumb' of straddling the frame with 1" spare of crotch is difficult to apply. Any shop will almost instantly fit a bike to you based on taking a shoes-on height measurement.

Thank you all for the advices. I did try them both and the 21 inch felt better and more comfortable. By the way giant yukon seems very nice.