There are a few tricks to keep the chain from rubbing on your tire. You have to have the sprocket installed correctly and you can add some washers along with gently spreading the frame to re-align the tire/wheel. How To Fix Chain Rubbing On Tire Or Fender On Motorized Bicycle Tin Snips – https://ebay.to/35yc2bn
How To Fix Chain Rubbing On Tire Or Fender On Motorized Bicycle 