Ask five riders why July wrecks more bike tires than any other month and you'll get five different answers. One might say heat, an other might say road debris, one might have a vendetta against goathead thorns, or maybe it's just bad luck. They're all a right, which is exactly the why July can be brutal on tires. Most flat tire advice picks one villain and ignores the other three standing right behind it.
The short version: hotter tube pressure, softer asphalt, more debris on the road, and more riders putting down more miles, all stacking up in the same four weeks. Here's how each one actually works, and what stops all four at once.
Okay, but is this even real?
Yes, it is. One bike shop owner in Brooklyn reported ordering 50% more replacement tubes than the same stretch the year before, during an especially hot summer. And to state the obvious, the inner tubes didn't get worse. It was just July getting harder on tires.
Some mechanics will tell you it's not the heat at all, it's just that more people ride more miles in July than they do in March, so of course more flats show up. Which they're not wrong either. Both things are true at the same time, more miles and hotter temps can play the villain. Which is why we wrote this for you to know how to fight back!
Cause #1: Your tire pressure is quietly working against you
Put your lab coat and safety goggles on, because it is time for a science lesson.
Heat expands air, and when air expands, it gets...bigger. That's just physics at play, not a Tannus marketing line. On a 90°F day, the air inside a fully pumped tube is pushing harder against the tire wall than it was that morning in the garage. Top off your pressure right before a long, hot ride and you're setting yourself up for a blowout. So be strategic with that PSI.
Cause #2: The road itself gets sticky
You know when you were a kid out at recess, and you and your friends would walk on the tar patch lines in the asphalt? Yeah, remember how soft those lines would be in the summer heat?
On a hot day, asphalt can run 20 to 30 degrees hotter than the air above it. A 90°F afternoon can push the road surface north of 120°F, right in the range where the binder in asphalt starts to soften. Road crews call it bleeding. For a rider, it means the road is tackier than usual, and glass or debris that would normally kick free under your tire has a better chance of sticking around long enough to work its way in.
Cause #3: There's just more sharp stuff out there
July 4th weekend alone puts more broken glass, bottle caps, and curbside trash on city streets than a normal week. In the Southwest, this is also when goatheads show up in force after the first monsoon rains, and they will find your tire like they have a personal vendetta against it, because they do. More debris on the ground means more chances for any one ride to end early.
Now as the iconic Clint Eastwood once said, "you've gotta ask yourself one question: 'Do I feel lucky?' Well, do ya, punk?"
Cause #4: Everybody's out riding
Bikes that sat in a garage all spring get pulled out for summer. Kids are out of school. Commuters add weekend miles on top of the daily ride. More riders, more miles, more total exposure to everything above. Even if your odds per mile stayed exactly the same, more miles means more rolls of the dice.
So what actually stops this?
You can't control the weather or the asphalt and if you do, please could ya help the rest of us out. As for the rest of us, we can control what's between the road and our tube.
Tannus Armour is a foam liner that sits inside your tire, between the tube and the tread. Glass, goatheads, wire, whatever survives a sticky July road has to get through the liner before it ever reaches your tube. It works with the tube you already have. No tubeless conversion, no sealant to top off every few months. Install it once and stop thinking about it.
Tannus Airless tires remove the air variable completely. No tube and no air pressure to manage means there's nothing for July heat to expand and nothing for a sharp object to puncture. If checking a pressure gauge before every hot-weather ride is the part you're tired of, this is the version of summer where you stop doing that.
Both solve the same problem from a different direction. Armour protects the setup you already have. Airless removes the setup that needed protecting in the first place.
July's going to do what July does. Your tires can keep rolling regardless!
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FAQ On July Cycling
Why do bike tires go flat more in July than other months?
It's not one cause. Hot pavement softens and holds debris longer instead of letting it kick free. Heat also raises the pressure inside your tube. Add more miles on the road and more litter from holiday weekends, and July adds up fast.
Does hot weather actually cause flat tires?
Heat alone won't cause a flat. It just stacks the odds against you. Higher tube pressure, a softer road surface, and more riders out at the same time all push in the same direction.
What's the best way to stop summer flats for good?
Tannus Armour blocks debris before it reaches your tube. Tannus Airless tires remove the tube and the air pressure entirely. Either one solves the problem from a different angle.
Are airless bike tires worth it in summer?
If checking tire pressure before every hot-weather ride is the part you're tired of, airless tires solve that specific problem. No air means nothing for heat to expand and nothing to pinch flat.
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