Rear wheel hardly spins

Sounds to me like he put the HE-Man torque on the sprocket he probably put the He-Man torque on the rear axle too...but to each his own..never posted up that anything else went bad...Hope all is still good!
 
i'm in the same situation. only i had replaced the front previously and the bike worked fine. i recently took off the rear tire and put a new sprocket on. went up 1 tooth. i get a knock when i spin the tire and the tire will not move move revolution when i spin it. i've removed the wheel three times and can't figure out what is wrong.
 
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