Im 5' 8" which size toptube is right for me? Right now i ride a 20.75 bmx

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bike, but im gettin a mountain soon? right now i ride a 20.75" toptube bmx bike, but im gonna be gettin a blk mrkt mountain bike, and im 5'8" which size toptube is better for me? the wheels are 26" and which is better for me? 21.5" or 22"
 
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