Instructables
Picture of bike tube repair
Repairing a bike inner tube is not only simple and cheap, but it's also mandatory in respect for the environment. Indeed a punctured tube can be repaired many times before being thrown out. A different matter is when the tube is cut or the valve leaks, since it's more difficult repair the tube. Anyway most of the times the leak is caused by a nail or a thorn, and the hole is very tiny.
Although many of you already know this process, I'll explain how to easy add a patch to a pierced bike inner tube.
 
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Step 1: The necessary

Picture of the necessary
All you need is a pump and a repairing kit. I take for granted you already know how to remove the wheel from the bike and the tube from the wheel, so I don't deal this topic here, ask in comments if you fall in some obstacle.
The repairing kit is composed by some patches (probably of different sizes), some scratch tools (sandpaper or a little metal grater), a little tube of mastic (a type of glue) and maybe some little rubber tubes to spread mastic.

Step 2: Inflate

Picture of inflate
First thing to do: find the hole. This could be simple or pretty long. If you're lucky the hole is big enough to listening the air flowing out when you inflate the tube. But many times the hole is so tiny that air comes out very slow and it's difficult to find, in this case go to next step.

Step 3: Blblblbbl

Picture of blblblbbl
To find the tiny holes inflate the tube. Don't be scared to inflate the tube very much, it could also become double in dimensions without exploding, and this will help you find the hole, since some hole remain closed with low pressure. At this time dip the tube into water, a sector at a time, until you see the bubbles coming out.
sidmarx8 months ago
Great 'ible. May i add that you can detect a leak not only by sound but also by rotating the tube past your nose or corner of the eye, more sensitive to a tiny squirt of air. I've also found it helps the patch stick if you spread the newly patched spot out on a hard surface, then tap it with a hammer, staccato like. My biggest woe has been unreliable or stale glue, so i inflate the repaired tube and let it stand overnight to ensure that the patch bonded.
spiny8 months ago
> Blblblbbl

:D
andrea biffi (author)  spiny8 months ago
ahah! :D
Shiseiji8 months ago
Nice! I teach basic bicycle maintenance at a bicycle coop including hands on tube patching. I use a kit that has instructions to show students the benefit of reading them (former aircraft mechanic where everything was done by the book). To your great 'struable I would like to offer: 
  • Make the mark of the hole twice as big as the patch with an "X" through the center of the hole. Allows for spreading out glue if too much is applied.
  • Don't touch the area that has been roughed up. Oil from your hand will contaminate the surface and impact glue adhesion. 
  • Use a thin layer of glue. More isn't better and if it is cold will take much longer to cure. If too much gets glopped on (technical term :-) ) use the end of the tube to spread it out.
  • If the thin plastic won't release from the top of the patch, leave it be. When 60+ psi push it against the inside of the tire, it isn't going to make any difference.
  • Don't forget to check both the inside of the tire and the tube protector strip on the rim for what caused the hole.
Shiseiji Shiseiji8 months ago
Meant to add a suggestion I read but can't remember where:
Put the tube in an old sock. Makes a great rag and you can put it on your hand if you need to swing a derailleur out of the way to remove the rear wheel.
andrea biffi (author)  Shiseiji8 months ago
Carbon copied to the ible this tip too ;-)
Thanks!
I'm glad you found my suggestions helpful. Looking forward to your next posting.
andrea biffi (author)  Shiseiji8 months ago
that's very useful and funny :-)
andrea biffi (author)  Shiseiji8 months ago
Ouch!! I FORGOT to mention to check the inner of the tire!! Thanks for remembering me that! It's extremely important!
I agree with all your notes and I'll take the opportunity to add them into my instructable. Thanks again.
Don't forget to rub the little block of chalk on the sandpaper over the repair and rub the chalk dust into the excess glue areas around the patch. This stops the tube potentially sticking to the tyre.....
andrea biffi (author)  Polishing Peanuts8 months ago
good to know... thanks!
Uncle Kudzu8 months ago
Well explained and well illustrated! It's been a long time since I've patched a tire, but surely my luck will run out eventually. Thanks, Andrea!

One question, though: when I was a kid it was common to light the adhesive with a match before applying the patch. What was that about? Do people still do that?
... Back in the ' Day ', we used to light the glue on the patch to pre-cure or ' vulcanize ' it. They are now self-vulcanizing and need no fire ...
Shiseiji RikJamez8 months ago
At the bike COOP where I teach basic maintenance, including a hands on tube patch), I offer this opinion:
Chemical engineers are paid a lot to create the adhesive at the lowest cost. I doubt burning off the violates is part of their product engineering or else it would be in the directions. Better, IMHO, to follow the directions.

Also, I suspect some confused the old Camel and Victor hot patches that were lit on fire with glue on patches.
RikJamez Shiseiji8 months ago
As I remember, the instructions said something to the effect of ' Apply glue to patch, let the glue dry until tacky ( allowing the VOCs ( Volatile Organic Compounds ) to evaporate ), apply to prepared tube over puncture, apply pressure to seal .
An older person than I, would set fire to the glue on the patch to speed up the evaporation of aforementioned VOCs. I assume they currently use a faster ' flashing ( evaporation of VOCs ) ' adhesive.
We always lit the glue even though they were supposed to be OK done cold. I still use the same process when patching the tubes on my motorcycles. No sense in buying a new tube if a simple repair can do the job.
andrea biffi (author)  Uncle Kudzu8 months ago
I don't know... I've to ask to my father... how old are you, uncle? ;-)
alzie8 months ago
Great 'able.

The lighting of the applied glue with a flame
is supposed to dry the glue faster and
get you on your way sooner,
especially with in cold weather on the road repair.

Another tip for finding the pin hole
is to run it in front of your lips.
Theyre very sensitive to the puffs of air.
Most of the time you wont need to do immersion.

Or, i like to use light film of soapy water
to find the tiny leaks.
Shiseiji alzie8 months ago
I suggest to my students that on the trail where options may be limited to what they have on hand they:
  • Inflate the tube to at least the size of the tire. The tube isn't going to be hurt, the hole will get bigger, and it will be easier to mark and buff.
  • If it's cold, hold the tube to their cheek. Using both feeling and hearing can often overcome cold numb fingers.
f5mando8 months ago
Well shared! Thanks for breaking it down.
harold Paine8 months ago
Very good, precise and succinct instructable.
®Mar228 months ago
awesome post. there is a much better patch out there. It's made by park tools No glue and the adhesive is instant and about 100x stronger than the glue. It's just a kind if sticker that you Peel off and apply. The patches and box take up about as much space as a stack of a bucks worth of quarters. it will change your life!!
msemtd ®Mar228 months ago
Here in the UK you can get self-adhesive tube repair patches from wilko's (a great UK hacker resource store) for £2.25 (http://www.wilko.com/bike-accessories/wilko-self-seal-repair-patches/invt/0258276). They have worked very well for me as a daily cycle commuter!
toad ®Mar228 months ago
those patches are incredible, I used one to put over a hole in my surfboard for a quick fix ten years ago. Its still there. they also work for protecting your paint where the bike cables touch the frame. They even work damp.
andrea biffi (author)  ®Mar228 months ago
nice! some links for our readers:
standard patch
pre-glued patch
tire patch
tareko8 months ago
Useful instructable. Thanks for sharing.
In my teen years, the bike was actually how you got from A to B. Bought patches were available but a bit expensive.
The next best solution was to have piece of an older inner tube. Cut to size, scraped and with a thin layer of glue it made a good repair and lasted.
Some times, the glue would harden in the dispenser tube and when you needed it, it was useless. The solution was to heat with a match, patch and inner tube. (Lighters were hard to come by and you actually needed a license to carry one). This was not a lasting repair, but most of the times it was enough to get you home.
NB. Then, the inner tubes were orange coloured. If one thing, they stretched more than the black ones of today. I’m not certain if both methods would work on these.
Where did you need a license for a lighter?
Portugal during the dictatorship.
In a way, it was a mean of protecting the newly developed portuguese match industry against imported lighters.
gary5x88 months ago
I use electrical tape and Super Glue. Instant fix, cheap, and has never failed me.
bob30308 months ago
This is good information and would be quite helpful for someone new to patching inner tubes. I've patched many over the years and have passed on these skills to my kids. I agree that it's good (saves money and landfill space) to patch a tube rather than to just throw it out and put in a replacement. When I have a tube with unrepairable damage, I save it to use in other projects where a piece of "rubbery" material might come in handy. One use is to cut the tube into wide heavy duty "rubber bands". Thank you for posting.
andrea biffi (author)  bob30308 months ago
Yes I also make rubber bands, if you cut it in thin slices you'll have almost standard ones (an huge amount from one single tube) and larger slices create very strong bands. Also I noticed that rubber from tubes is very enduring compared to commercial bands.
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