Cool Mongoose! It looks just like one I keep seeing on the Denver craigslist - the same size as yours, too (my size as well, which is why it keeps showing up when I search 23".)
Check it out:
BMX - Mongoose ATB
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revcp, thanks for the brake info. Looks like vintage-style brakes would be simpler to deal with and less expensive than aero levers too. So much good info in this thread for newbies like me. Thanks to all who participate in this thread.