fix a flat
Flat tires in cycling are nearly inevitable. The advent of tubeless technology has lessened the problem significantly, but it still happens and you need to be prepared to fix a flat.
If you're running traditional inner tubes, you can patch the puncture or simply install a new tube and patch the other one later.
If you're running tubeless and the tire will not hold air, install a tube to get you home and find the problem with the tire later.
what you need to carry
patch kit
Modern patch kits come with pre-glued patches so you're not cussing that dried up tube of cement you found in your tool kit.
co2 & inflator head
CO2 cartridges are the lightest weight and easiest way to carry inflation power. You can also opt for a mini-pump if you prefer.
How to do it
Step 1: Pull the wheel off the bike.
Step 2: If all the air is not yet out, let it all out via the valve and by pressing the tire to push out all remaining air.
Step 3: Insert your tire lever under the bead at the inner edge of the tire and pry, lifting the tire over the edge of the rim.
Step 4: Remove the tube (if you have one installed.)
Step 5: Find the cause of the flat. Lightly run your fingers around the inside of the tire to locate the offending material. LIGHTLY. Could be glass or something else sharp that will damage your finger like it did your tire!
Step 6: Patch existing tube or add a new tube (also if you’re running tubeless.)
Step 7: Re-install the wheel.