nevermore1701

yesterday i blew out 2 tubes on my rear tire.on the third one i noticed i had a bubble in the tire. these tires are less than a month old. they are kenda black belts. do i try to make the bike shop replace or should i just suck it up and buy another tire? on a positive note.....my pump was worthless as i discovered on side of road so i did purchase a new topeak mountain morph pump and it is bad ass

10 Wheels

You can asked the bike shop.

Homebrew01

Hard to judge without pictures. What do you mean by "bubble" ? Is there a cut in the tire that the tube poked through and popped ?

nevermore1701

looks like a 1/4 inch slice in side of tire right by the rim and this caused some of the tube to stick out. i didnt hit anything so i do not know what may have caused it

cny-bikeman

The fact that you are not aware of hitting anything does not mean you didn't encounter a road hazard. For example you could get a cut by running over a curved piece of broken bottle, which could flip up and cut the sidewall. That's just an example of something I can picture happening - the possibilities are endless. I can't count the number of flats I found caused by unused staples. Yet to be answered is how a staple could get into a vertical position, braced sufficiently to penetrate a tire - but it happens. A cut is not any kind of tire defect but conceivably could be caused by a bike shop person carelessly cutting open a bundle of tires.

10 Wheels

Sounds like a glass cut.

FBinNY 

This is classic. Happens all the time.

Take a careful look at the brake shoes. Odds are one is a bit high and worn so it overhangs the rim and rubs the tire. The other possibility is that riding under-inflated flexed the tire wall against flexed against the edge of the rim where imbedded dirt abraded it enough to make a cut.

As far as a defect goes, my basic rule is cuts, gouges, grooves, etc. along the rim line aren't defects, they're caused by something. Ragged tears along the fabric ply lines (45° bias) are probably defects, unless there's an obvious outside cause.

nevermore1701

i appreciate all your answers. and most of the things actually happened yesterday when i blew my first tube on my morning ride. i will just buy a new tire and be happy i can ride again. thank you all for the input \m/\m/

FBinNY 

Don't forget to track down and fix the cause. You'd hate to do this to a new tire.

lunacycle

Also, feel around the inside of the tire for bits of wire, or other sharp objects. Neglecting to remove those will result in multiple punctures in the same location. I use my bare fingers to do this, although others advise against it. Really small bits of wire may go unnoticed with a gloved hand. The downside is that you tend to cut yourself when you find the little bugger!

bikeman715

use a cotton ball to find the item(s) embed in the tire . that way you don't cut your fingers .

FBinNY 

I guess you didn't read the OP's last post. He's buying a new tire, so I doubt he'll find it contaminated with road debris (yet). In any case, the OP saw the immediate cause of his flats, a cut in the wall of the tire.