New tubes and tyres rules out the possibility of a sharp thing embedded in the rubber.
Look closely at the hole and figure out what side its on.
Hole location |
Likely causes |
Remedy |
The same side as the valve |
Spoke/nipple poking through rim tape
Rim tape moved off spoke-hole |
Remove tape and file point smooth
Slide rimtape back into place, or replace. |
Outer rolling surface |
Sharp thing embedded in tyre |
Invert tyre and look in that quadrant. Use a bright light and a pick |
Small twin holes about 10mm apart |
Snake bite - riding at too low pressure |
Increase tyre's air pressure |
Ragged flappy exploded look |
Hernia - tyre has a large hole/cut, tube pokes out |
Install boot inside the tyre, and buy a new tyre soon. |
Within 10mm of valve |
Sharp edges in rim |
Deburr rim's valve hole |
Single cut on "side" |
Pinched tube during installation |
Work on your technique |
Seams in tube peel apart |
Perished rubber, old age, poor storage |
Replace tube |
There is also a possibility of tube having a manufacturing defect too.
Aside - some technique here can help too. Always put the tyre on in the same place, with the logo at the valve stem, and correctly matching any rotation markers. This helps a lot with isolating the area causing the puncture, gives you less tyre to search.