Got a 1968 BMW motorcycle in my hangar. Weighs a whopping 416 pounds. Been there for 15 years, and I keep an eye on tire pressures (on everything, not just the bike). Keep about 28 psi in it, check and add a little air as needed - usually 60 to 90 days. I even have a checklist for all the rolling stock so I don't miss anything. (Bikes, mower, tractor, cars (including spare tires), airplane, utility trailer, JD Gator, even a wheelbarrow - OK, I'm a bit retentive . . . )
One fine day, I notice the bike is sitting at an odd angle . . . the entire sidewall of the rear tire had failed, an arc about 8" long.
Interesting thing is that the tire is (or was) a top quality Avon 3.50S by 18, which I bought new and installed myself (had a motorcycle shop in a past life). Fewer than 1,000 miles on it since new, kept out of the weather, no sunshine, etc. and it basically fell apart.
I can take a hint - when that bike goes back on the road, it is going to have BRAND NEW tires and tubes front and rear, period, I don't care how good the existing tires look. I've had flats and blowouts on a motorcycle, front and rear, and it ain't no fun.
Best Regards,
Mike/Florida