NO!
You can remove bearings from a BMX frame with a 'mid' bottom bracket without damaging them using a 3/8s rachet extension.
Check the frame bit beneath the bottom bracket
Yes, if you can find the correct bottom bracket for the frame.
The frame number can usually be found on the underside of the bottom bracket. With that you might be able to track down the year-if you find someone who can tell you how to decode the frame number.
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Installing a mid bottom bracket is very simple. All you do is tap both bearings into both side of the frame evenly, they do not have threads or anything like that its just simple pressure, don't hit it to hard though because you could crush the bearings.
The most common shape for a bicycle frame is pretty much triangular. One main triangle with the bottom bracket, fork and seat post at separate corners. Then there is the rear triangle, with rear Wheel, seat post and bottom bracket at the separate corners.
It's a bike frame that measures 18" from center of bottom bracket to top of seat tube. 18" would be just a tad shy of mid-sized.
Never heard of either a mid or a spanish BB. Here's a link that might either answer your question or let you re-post it in a format that makes sense: http://www.sheldonbrown.com/gloss_bo-z.html#bottom
Unfortunately not, or at least not in any reasonable manner... It's one thing to get a spacer made for the tube welded to the frame which would allow you to use a smaller-than-stock bottom bracket but to go larger you'd literally have to cut the bottom bracket housing off of your current frame, grind the connecting pipes to a larger radius and then weld a larger bottom bracket housing in place of the original small diameter housing. Keep in mind that if you decide to try this, the frame MUST be made of steel. Carbon fiber or Aluminum will be a disaster. However, as I mentioned earlier this will NOT be a fun ordeal and unless you have extensive welding (and cutting) experience it won't go well.
yes... if you have the right bottom bracket... it has to fit the cranks as in 19 20 21 or 22mm most likely......... and it has to be the right size for the frame.. if its bmx it will probably be US size or euro, spanish or standard. if you find the right bottom bracket with the right size bearings then yes..