Keep getting flat with road bike tires

Question

I keep getting punctures with road bike tires riding the street in Baltimore. I know they are not the cleanest but I should not be getting a flat every single time. Using Continental Gator Skin and Continental 28mm tubes on my Trek hybrid, which I converted to dropbars to make as many improvements without blowing the bank on a road bike.
I typically keep the PSI around 80-90. These are new tubes and tires as I thought the first flat was related to having tubes and tires that hadn't been replaced in 5 years. However, that was not the issue. I was able to identify one cause being a 3-4mm glass shard that punctured the tire and tube. This most recent puncture shows no sign of puncture on the tire for a very tiny circular puncture on the tube.
Can anyone suggest a couple reasons why I would be consistently getting flats other than road conditions?
Should I consider getting some commuter tires instead?

Argenti Apparatus · Accepted Answer

First thing to check for is sharp foreign objects embedded in the tire that poke through to the inside. These can be small enough or not protrude enough to be invisible, but can poke a small hole in the tube over time.
As this has become a chronic problem I'd thoroughly inspect the insides of your tires. Remove tires from the rims and turn them inside out. Use bright light and run your fingertips along the interior surface feeling for small sharp objects in the rubber. Run your fingers both directions to catch objects embedded at an angle.

Benisacat · Answer

I kept getting punctures. Now I fit my bikes with good 'puncture resistant' tyres and inflate the tires to the pressure marked on the tyre walls. I haven't had a puncture in three years of bicycling 80km a week in and around Oxford, Britain. So this works for me.

Answered by Benisacat on January 20, 2021

Keep getting flat with road bike tires

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