>>1319191You sell it and get the right size.
But if you insist, assuming you can pedal the thing, you buy a longer stem and possibly a longer seatpost. The bike is usually lighter, stiffer, more agile, but is less stable.
In severe cases you look like a bear on a clown bike. Pic generally related.
>>1319206Always check the manufacturer. And trust your ass. If going in blind, start with L frames.
