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It will be kids-sized yet somehow still weigh 50 pounds, the tires will be made of plastic, the single-wall rims will explode the first time you hit a pothole (or foolishly let yourself believe it's really a "mountain bike" and take it offroad), the cranks will be a plastic shell hiding a hilariously thin metal arm that would probably snap if there weren't five other weaker parts in the chain, the brakes will be borderline non-functional, and there's at least a 50% chance the 12 year old chinese kids and walmart wagies who assembled it forgot to put grease in fucking anything.
On the plus side it's got a shimano rear derailleur (the absolute cheapest, shittiest one they make) so at least 3 or 4 of the 18 gears might actually work, and you won't have to worry about the tiny frame size destroying your knees because the welds will fail long before then.