Join Date: Mar 2014
Location: North Dakota
Bikes: DK cygnus, Trek Bruiser, no-name single speed roadie
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well first off, what kind of MTB do you have? dirt jump parks are a TON of fun on a mountain bike. Good parks will have beginner sections where you can learn to pump and roll and work your way to more advanced stuff. The cool part is if you do it right, there really won't be much wear and tear on your bike.
Now, if you REALLY want a bmx bike, at 6'1", you'll want an XL sized frame, which basically means it has a 21" top tube, and a chainstay length of about 13.75". This sounds complex, but it's really not. jrbicycles.com or danscomp.com will have these specs. So I'd say go on those sites, find a bike you like with those specs, and then look for one used on craigslist, ebay, or a local paper. Hope that helps. Get out there and shred.