Hi.

If what is happening to you is what happened to me, your tire is rotating 
on the rim. 

This sometimes happened when I was using an undersized tube like Patrick M. 
mentioned, but it happened a lot to me when using modern tires on older 
rims, and less when using a tubeless compatible rim. Flats generally 
occurred when riding somewhere that involved heavy braking, and occurred on 
around three different bikes I have or have had. Like the one time I got a 
front flat at this spot 
<https://www.google.com/maps/@37.8275685,-122.5030476,3a,75y,255.79h,85.47t/data=!3m6!1e1!3m4!1sWDi65VsGmuS7PLyVeiu63g!2e0!7i16384!8i8192?entry=ttu>.
  
I sometimes speculate that the rim heating up somehow aids with making the 
tire rotate, which then tears the stem, but that is just a guess.

Moving to a tubeless setup was the only cure I found.

On Thursday, August 3, 2023 at 9:54:21 AM UTC-7 J J wrote:

> Hi, I was inspired by Matthew's "Patch or Replace Tire" thread, but didn't 
> want to usurp it with my question/issue, so I'm starting a new one. 
>
> My tire went flat during a recent ride on my Hunq. Upon inspection I saw 
> that there was a tear near where the valve stem attaches to the inner tube. 
> No biggie. I replaced the tube with a spare, got back to riding, but within 
> 15 minutes, another flat. Same tear in the same location. I replaced the 
> tube with yet another spare. This was starting to feel weird. The same 
> thing happened within a few more miles, another tube gone. 
>
> I had no more spare tubes, but a buddy gave me one that is specced for 
> narrower tires. I managed to get back home without incident.
>
> The attached pic shows where the tear occurred in each instance.
>
> But three flats on a single ride! I replaced the tubes the way I always 
> do. Nothing dramatic about it. I used a pump to inflate two, and a C02 
> cartridge to inflate another. I snugged the valve nut like I always do, not 
> too tight, not too loose. I handled the valve stem carefully, no jerking or 
> bending it. The air pressure was about medium, not too high, not too low. 
>
> I used three different types of tubes, one a Schwalbe, another was a 
> no-name, and the other was a Teravail. I inspected the 50mm Schwalbe 
> Marathon tire carefully and found nothing of concern, no glass, screws, 
> metal, shards, etc. The Lesnik-built wheel itself had run fine for many, 
> many miles with no issues, no flats, nothing, and is in excellent 
> condition. I had been riding on smooth pavement when the flats occurred, 
> and there was nothing remarkable on the road.
>
> But suddenly, on that day, all inner tube hell broke loose. I'm stumped. I 
> don't know what to do differently so I've been thinking about the saying 
> (misattributed to Einstein): "Insanity is doing the same thing over and 
> over again and expecting different results."
>
> I'd be grateful for any ideas you might have or experiences you can share. 
>
> Thanks!!
>
> Jim
>
>
> [image: IMG_8384.jpg]
>

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