2 Pieces Inner Tube 4.10/3.50-4 with Tire Lever，Valve Stem for Wheelbarrow Lawnmower Stroller Generator Garden Cart

Universal causes of tire and tube failures:

A single puncture or small hole usually comes from a thorn, wire, or small nail. These may be repairable. Check the tire as well for thorn etc. then remove it.

Double slots are usually the result of rim pinching. The tube was pinched between the rim and an object in the road/trail. Increase air pressure or use wider tires.

Eruption causing a large ragged hole. These are generally not repairable. Also check for damage to tires and rims.

A long-term cut or tear can also indicate a tire explosion. Typically, this is not repairable. Use caution when sitting in a tire during installation.

Inspect Before Installation

Inspect the outside of the tread for nails, pieces of glass, thorns or other protruding objects.

Visually inspect the inside of the tire casing for nails, glass or debris. Wipe the inside of the case with a cloth, then carefully feel the inside with your fingers.

Be careful if you use a tire lever. The tire lever is very easy to punch a hole in your inner tube.

Inspect both sides of the tire for the bead seat and for any signs of tube release. Reinstall if necessary.

How to inspect the hole on the inner tube?

Inspect for air leaks by holding the inner tube close to the sensitive skin of your lips or near your ear. Move the tube around its circumference.

If these steps don't work, push the inner tube into the water and watch for bubbles in the hole.