I replaced my old gum wall tires with a set of 27" x 1.25" Conti Gatorskins. I mounted the new tires (with new tubes and new rim tape), inflated to 90PSI and left the bike in the garage while running some errands. Within a couple of hours my wife heard a loud bang from the garage. The front tire blew off of the front rim splitting the inner tube in the process. I took the wheel down to my IBS where I purchased the tubes assuming the tube had failed. They asked me how old the bike was. When I said around 20 years (I'm being conservative as I purchased it in '81) they kringed and suggested I not inflate the tires over 85PSI. When I asked why they said the newer tires are not going to seat well in my old rims. I asked if I should replace my rims at which point they said "don't put anymore money into a 20 year old bike". My BS meter began to peg on that statement.
Is this going to be a safety issue for me? Should I put new rims on it or ditch the bike? The bike seems to be in perfectly fine shape and rides like a breeze.
My BS meter is still reading high as I suspect the IBS was wanting to sell me one of those "fancy schmanzy" bikes for >$1.5K.