How to Patch a Bicycle Inner Tube

How to Patch a Bicycle Inner Tube


In this video, we’re going to show you proper
use of a patch kit on a bicycle inner tube, including pre-glued patches, self-vulcanizing
patches, and emergency tire boots. We’ll also show you things to watch out for to
avoid getting more flats in the future. Hello, Calvin Jones here with Park Tool Company. First, let’s go over the tools and supplies needed. You will need tire levers to remove the tire
and tube, a pump or method to inflate the tire, a marker to mark the hole
and a patch kit. The most reliable fix for a punctured inner tube is to simply replace it with a new one. However, if the hole is smaller than the patch,
it may be possible to repair it. This process begins with the tire and tube
already removed from the rim. If you need help with the removal process, see this video: If you have a flat, knowing the cause can help prevent future flats, so always inspect the components:
the tire, the inner tube, and the rim. When possible, reinflate the inner tube to at least twice its normal width and look for leaks. By over-inflating the tube, you’re allowing any small
pin-holes in the tube to be detectable. Listen and feel for air escaping the inflated
tube. Be sure to inspect the entire tube. In some cases, immersing the inflated tube
underwater will make the hole easier to find. If you plan to repair the tube, mark each
hole, then deflate the tube. The type of hole tells us about how the tube
was punctured, and helps us prevent another flat. A small pin hole in the tube may indicate
a puncture from a thorn or small wire. Feel carefully inside the tire body as you look for thorns, pieces of wire, glass or metal. Remove whatever you find. If there is something stuck in the tire tread
but it has not gone through the casing, the tire is not compromised.
Remove the object from the tread. A single or pair of short cuts along the side
indicate the wheel hit something while riding, such as a pot hole or rock. These are called “snake bites”, and can also
be the result of running too low of air pressure. A blow out often appears as a large shredded hole. The tube may have poked out through
a rip in the tire casing. A blowout can also be caused
by an improperly seated tire. With the tube outside the tire,
it has no support and it blows out. This type of blowout looks like a long horizontal slit. If there’s a rip in the tire’s casing, the
tire should be replaced as soon as possible. As a temporary fix, you can use the
Park Tool TB-2 tire boot. Peel the backing and apply over the damaged area. If you have inspected the tube and find no holes, it is possible the leak was at the valve core. Put some soapy water on the valve
and inspect for any bubbles. Schrader valve cores and removable
Presta cores can be tightened using a valve core remover
such as the Park Tool VC-1. Finally, inspect inside the rim. Look for
problems such as holes or failure of the rim strip. Here the rim strip is damaged at an eyelet, meaning
it will not support the inner tube under pressure. In this wheel, the spoke is a bit too long
and is poking into the inner tube. Once you have located and marked the hole,
it is important to clean the area. One method is to use the sandpaper
that comes with the patch kit to clean by scraping a larger area
than the patch you will use. When possible, wipe the area clean using solvent that doesn’t leave a film, such as alcohol. Allow the area to dry completely. When using pre-glued patches,
such as the Park Tool GP-2, peel off the adhesive backing
and lay the patch squarely over the hole. Apply pressure to the patch to seal the hole. The tube is ready to install inside the tire. Do not test the patch by inflating
the inner tube outside of the tire, as you may stretch the inner tube
beyond what the tire body allows. This pulls on the patch and weakens the bond. If you are using a vulcanizing patch kit such as the Park Tool VP-1, begin by puncturing the tube of fluid. Apply a thin coat of fluid. Use a clean finger or the back of the foil patch to spread the glue evenly around the area of the hole. Don’t be in a hurry to stick on the patch.
Allow the fluid to dry – this may take several minutes. Test by touching the very edge of the fluid. Peel off the foil backing from the patch,
trying not handle the surface. Apply the patch to the tube, centered on the hole. Apply pressure to the patch, especially around the edges. Leave the clear plastic cover on the patch – it reduces the friction and rubbing on the new patch. After a minute or two, inspect the bond of the patch to the tube, seeing that the edges look adhered to the tube surface. The tube is ready to be installed in the tire or packed away as a spare for the next ride. When packing a repaired tube, bleed out the air as you roll it up. This keeps the size to a minimum. If you need help reinstalling the tube, see this video. And that’s the basic process of
how to repair a bicycle inner tube. Thanks for watching, and be sure to subscribe for the latest videos from Park Tool.

Only registered users can comment.

  1. I used to use patches all the time and rarely had a problem. maybe I should do this again, it sure is cheaper and less wasteful. hmmm…

  2. I always thought u where supposed to put the glue on the patch a just put it on the tube this video actually helped

  3. I've returned several times to this video – it's been of much aid in dispiriting moments. Thank you, and my compliments to your magnificent mustache.

  4. Wait what? You guys throw away the tube when it's punctured?!!!! My tube has 6 patches on it and it's still running strong.

  5. Those patch never work….Just take a old inner tube …cut a piece… scratch it with a sandpaper and glue that with a glue gun after you did scratch the inner tube with sandpaper ( to get a better grip for the glue)

  6. Hello, inside puncture repair kits here in uk they have small rubber tubes called valve stems. What are they and what are they used for please?

  7. Thorne Resistant tubes are the answer and sure some complain about the weight but its a bicycle and its all about fun and exercise so what a little extra weight.

  8. i repair sidewall tears by bracing the tear with a piece of sidewall cut from an old tire, and then put gorrila tape over it to make sure it doesnt move

  9. Wow I did not come here expecting to learn something. I never let the rubber cement dry a little bit before putting on the patch.

  10. WARNING: NEVER RUN YOUR HAND ON THE INSIDE OF THE TUBE TO FIND THE THORN. I found this out the hard way, not only did I have a puncture, I also had a thorn in my finger that only goes in deeper as you try to pull it out. Use a rag and run it around the inside of the tube and it will snag on it.

  11. I repair my cycle rubber tube punture at home , I use rubber solution ready-made patch but problem is that my rubber solution solution tube is become hard unuseful in short time, pl give me some tips how the rubber solution keep ok long time.

  12. Very informative video, loved it. I have always had problems patching a tube when the pin hole is close to the seams on the tube. Tried removing the seam with sandpaper, but it is very difficult. Any suggestions on how to seal these leaks.

  13. Thank you sir helping repair my snake bite. After watching I am sure it was from the tube not having enough air. I tried to follow the directions from the repair kit purchased a few days ago but the rubber didn't stick leaking air because I did not know I needed to apply the glue on the surface instead of the patch. Your instructions suggest to allow the glue to dry for a few minutes. After following your advice the tube is good as new.

  14. question … is it better to inflate to place the repair patch ? because when tube get inflate the patch scratch ?

  15. Calvin, what would you do if you discovered the patch had not adhered along part of the edge, as shown at 5:55? Would you add glue to the non-adhered portion, or would you remove the patch and start over?

  16. I was helping my freind patching his tube and he didn't check the tire for thorns so I told him he needs to check the tire and he found a big thorn inside

  17. I prefer to use the stick on patches. Just peel off from the backing and apply to the tube. No messing around with glue and waiting for it to go off. Works very well.

  18. My dumb ass took the tires off with pliers, then tried to rip the plastic off the new tube with said pliers and accidentally grabbed the tube with them ripping a tiny hole in it😒

  19. My husband bought a CCM repair kit. It has been awhile since he has had to buy one, so of course the black patch outlined in orange was new to him. The kit came with absolutely no instructions. Good thing we found your Video which showed which part of the patch should be facing upward. He had it the opposite way. Perhaps CCM didn't include instructions because they just assume that everyone has access to the Internet to look for instructions. My husband commented that if someone got a tire puncture while biking on a trail in the middle of the woods then instructions would come in handy! Mind you, CCM might suggest you use your smart phone to find a video such as yours, but, we are the lonely few that does not have or use a smart phone. Thanks for letting my vent! I plan to write to CCM to ask why instructions weren't included in this repair kit.

  20. Sir can i ask my innertube is loosing air if its inside the wheel but if its not it doesnt and it doesnt have hole and the valve is ok please help me

  21. Thanks I bought a park tool patch kit wasn’t sure how to use it I do now by watching your video 😊👍

  22. You have that marker, you should mark the tire on the drive side to index it to the rim. Make a mark on the tube to indicate drive side also. Then, continue with the dismount and tube repair. When you find the hole in the tube, it’s trivial to find the exact spot on the tire for the object that caused the puncture and remove it.

  23. Thank you!!! A great video. I've been riding for many years but it doesn't hurt to have a refresher course every now and then. 🙂

  24. On the trail or side of the road, reverse the process: Remove the tube but keep in in the same position in relation to the tire (or mark them both in the same spot). Examine the tire for the foreign object and once you found it you'll know where to look on the tube for the puncture. Remove the object and patch the tube.
    When partially inflating the tube to reinstall, use your mouth to blow air into it rather than use the pump. That will prevent over-inflating and popping the patch.

  25. 5:00 – Yup, you always have to pop open a new tube of glue, since the one you used last time a month ago will be completely dried up.

  26. I found Flex Tape works great. Clean and roughen like usual, then partially inflate the tube and quickly apply the tape. This tape isn't flexible as the name implies. It's just the trade name. I cut little squares for my repair kit.

  27. I had to do this today with my mtb. Pinhole in the tube and could not find a hole in the tire at all! Pain in the butt.

  28. . . . . . I had a tube of glue and it actually said : "step 5 DO NOT LIGHT THE GLUE ON FIRE !" they Must be referring to my older Brother ! LOL

  29. If in using a vulcanizing patch do I need to let the fluid dry completely or do i have to put on the patch when it is not completely dry

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