Google "mongoose serial number". That is what anyone here would have to do to answer your question. You may or may not be able to determine the age from serial number, but bike condition is far more important than age..
SOURCE: New Mongoose 700c Men's Paver bike: Mongoose 700
Local bike shop determined that both wheels were defective. I took the junk back to Walmart and got a refund... PROBLEM SOLVED!!
SOURCE: Mongoose Handlebar adjustment
where the bars slide into forks there should be a allen nut on the top undo this slightly and adjust bar height then tighten up allen nut
SOURCE: freewheel spins both ways cant peddle no were how
The freewheel has a ratchet pawl (an internal, spring loaded lever) that would normally engage gear teeth in one direction and click over them in the other direction. This is just like the action of a ratchet wrench. You might have a broken spring or broken pawl - in which case you will have to replace the freewheel---- Or it might just be dirty. Spray some WD 40 inside it (spray through the small gap between the round part that moves and the round part that doesn't. If that doesn't work, you'll have to replace it.
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