Here are the steps to fix a punctured bicycle tire:
Prepare tools and materials: You will need a tire lever, a new inner tube (if the old one is damaged beyond repair), a patch kit (including patches, glue, and sandpaper or a file), a pump, and possibly some lubricant like soapy water.
Remove the wheel: Use the appropriate wrench to loosen the axle nuts and remove the wheel from the bicycle.
Deflate the tire: Completely release the air from the punctured tyre by opening the valve.
Remove the tire from the rim: Insert a tire lever between the tire and the rim, and pry the tyre bead away from the rim. Use two or three levers to work around the wheel, gradually removing the tyre from the rim. Be careful not to damage the inner tube or the rim.
Locate the puncture: Remove the inner tube from the tire and inflate it slightly. Then, submerge the tube in a bucket of water or run it under a stream of water. Look for the bubbles that indicate the location of the puncture. If there is no water available, you can also feel or listen for the air escaping. Mark the puncture site with a pen or chalk.
Prepare the puncture site: If using a patch kit, clean the area around the puncture with sandpaper or a file to roughen the surface. This helps the patch adhere better. Then, apply a small amount of glue to the punctured area and let it dry until it becomes tacky.
Apply the patch: Peel the backing off the patch and firmly press it onto the punctured area. Make sure there are no air bubbles or wrinkles. Press around the edges of the patch to ensure a good seal. If the puncture is large or the tube is badly damaged, it may be better to replace the inner tube with a new one.
Re-install the inner tube: Before putting the inner tube back into the tyre, check the inside of the tire for any sharp objects that may have caused the puncture and remove them. Then, carefully insert the inner tube into the tyre, making sure it is not twisted or pinched.
Install the tyre on the rim: Start by fitting one side of the tire bead onto the rim. Use your hands to push the tire onto the rim as much as possible. Then, use the tire levers to help pull the other side of the tire onto the rim. Be careful not to trap the inner tube between the tyre and the rim.
Inflate the tire: Use a pump to inflate the tire to the recommended pressure. Check the tire for any signs of leaks or bulges. If everything is okay, re-install the wheel onto the bicycle and tighten the axle nuts.
Final check: Give the tire a final visual check and make sure it is properly seated on the rim and inflated to the correct pressure. Also, check the bicycle's brakes and gears to ensure they are not affected by the tyre repair.
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