I have an old Raleigh from the 80s I think. Ive had it about a month and just checked the tire pressure yesterday. I filled them up and about 20 yards down the road, the back tube pops. Then as Im walking it home the front pops. I got new tubes today and the back went fine but as I was filling the front it popped on me at about 60psi. I'm thinking it may be the tire because the metal rim is exposed in a couple spots but I'm not really sure. Any help would be appreciated.