My son has a bike that was given to him by a close friend who said it
was very expensive, custom built. I sent pics to a bike shop in town and
they replied that it was a "Walmart knockoff, worth no more than $50."

Bike says Acer Shimano brake system, it's a 21 speed (needs chain), 26" wheels,
alloy frame (says Shimano), also says "TANK in a couple of places and has a "Rocky Style"
decal. I have the serial number and patent number. I still cannot seem to identify this
bike! Help, please!

If I should decide to sell it, I don't want to make a fool of myself, and I should
know a starting price point, and also how to create a description including all info
important to a prospective buyer.

Please only respond if you actually know. Thanks!

Yes, I'm a newbie, I don't know anything about bikes, and I am relying completely on
you!