tires size questions

#1
I have 3.00-10 tires on my alexander reynolds mini-bike. these are wire rims also. The tires need to be replace and i was wondering if i 3.50-10 tires would if the 10 inch rims. i going to go with scooter tires. either 3.50-10 or 2.00-10 tire. i want the back tire wider than the front tire. Also does anybody know where i can get a brake drum for the rear wheel.
 
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