I found out the hard way that those cheap Bell brand tires from Walmart don't seat well on old 27 in wheels. I pumped up the tire then developed a cyst after 5 mins on the road. It felt weird, so I looked back at the tire and it popped as I was coming to a stop.
So, I replaced the Wally world rubber with this...

https://www.biketiresdirect.com/prod...FVI2aQodsJIFnw