(I made an earlier post about this, but deleted it due to improper terminology, so here’s the fixed version)
Pic 1: old tube
Pic 2: new tube
Pic 3: tire
I went to replace the rear tube on my bike that I use to commute, but the new tube ended up popping while inflating.
It looked normal at first when I inflated it to 20psi, but when I went to 30psi the tube began bulging out from the sides of the wheel. The recommended psi on the tire is 40-60psi.
At first I thought the issue was that the tube was not the right fit for my bike. My front tire is at 60psi but it looks normal and doesn’t bulge. Where did I go wrong? The tire would have been severely below pressure without more air.
Also, any recommendations on new tubes would be greatly suggested.
by VinceTheVibeGuy
6 Comments
Likely the new tube wasn’t seated properly, most of us probably had that happen at least once. Check for bulges as you inflate, deflate if you see (unless you like hearing loss), restart and try again.
It’s not your tube.
Assuming you are using the correct size tire for that rim, it looks like the bead of your tire isn’t seated on the rim properly.
Air it up just enough to give some firmness to the tire then work your way around the rim flexing the tire back and forth to make sure the bead of the is properly set against the lip of the rim. Use the guide line on the side of the tire to do that, it should be parallel with the rim and the same distance all the way around.
Then once you are sure the tire it seated properly, continue filling it up.
There are probably a bazillion YouTube videos showing how to properly fit a tire on the rim. Here is one that is good: [https://youtu.be/eqR6nlZNeU8?si=ZrzcCYDzPbBQHtc3](https://youtu.be/eqR6nlZNeU8?si=ZrzcCYDzPbBQHtc3)
You caught your tube between the tire and the rim, I guess. That’s one of my bigger nightmares when changing tube in the middle of the road, tired and in the hurry. Next time make sure that you can’t see your tube anywhere, drag your finger over rim on both sides, make sure tube isn’t pressed by the tire, push her deeper up into the tire if visible.
Agreed. If the tube bulged OUT of the tire, then the tire wasn’t on the rim correctly.
Browns rule of tire sizing. “If two tires are mathematically the same size but one is expressed as a decimal and the other as a fraction they are not compatible.”
I almost had it happen once before I caught it. I find my tire not sitting right on the rim after I give it around 15psi, the bead of my tire is slightly off the rim. I let out all the pressure, push the tube around inside to make sure it’s fully in, line up the valve correctly and air it up. Glad I caught it before airing up.