Re: chain and tire problem!
This gave me clearance to spare and can run wide tires. Ate one tire up though before the spacing, I would change out the stock tube for a heavy duty tube while the wheel is off, Plus maybe change the bearings out for loose bearings if it is a Walmart bike. Bearing can be found at ACE Hardware as well as bike shops. Kind of a pain learning how coaster brakes go back together and keeping the bearings in place with grease while you assemble, Maybe it is just that I weight over 230lb and ride rough roads. But those washers are easy to do.
Always do a pre-ride check. Make it a habit, and ride safe.