Mountain bike size

[merc-c]

I am looking to buy a mountain bike,
I have seen various websites stating different sizes recommended
for my inside leg 32"
most say 18 or 20 frame size.
I am looking for a hardtail bike.

 

[74merc]

What height are you? Length of frame may be an issue too. Best to try a few for fit.

 

[Stratman]

Generally speaking you're better off with a slightly smaller MB frame than you would need for a road/racer style bike, assuming you'll be taking it off road. You'll be dabbing your feet far more often so you don't want to be stretching for the ground. It will also give you more clearance over the top tube, very useful for avoiding crushing in the gentlemen's area.