How To Fix A Flat Tyre – Fix A Road Bike Puncture
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How To Fix A Flat Tyre – Fix A Road Bike Puncture

October 19, 2019


Getting a puncture whilst you’re out
riding is an inconvenience. However, it will happen to all of us that
ride regularly at some point. You can reduce your chances of getting one
by making sure that you replace tires when they start to wear out. But even then it
only takes a sharp piece of glass or thorn and you’ll have a flat tire. We always
recommend at a minimum that you take out a multitool, along with a pump a couple of
spare inner tubes and a couple of tire levers. And it’s those last three which
we’ll need today to fix this flat tire. Easiest way to get the back wheel out is
to firstly put your chain down to one of the smallest sprockets here on the back.
So just click believer down, give it a few turns until it’s on to that
smallest sprocket, put the wheel on the floor. Don’t be tempted to turn your bike
upside down and rest it on the levers because you can potentially scratch them.
Just gently put it down on the non-drive side, preferably on a bit of grass. It’s
time to remove one side of the tire. You don’t need to take it off completely.
Firstly, make sure that any air is completely out . Take one of your tire
levers, get in underneath the beading on one side of the tire. Put your other one a
few inches further around, basically where you can get some grip
underneath the bead. Some kinds of tires, you can just start to slip your tire lever
around like this and it will fairly easily come off all the way around. So one side
of the tire bead is completely off. Pull it all the way out until you get up
here to the valve, lift the tire over to reveal the inner tube and you’ll just be
able to pull that inner tube out. Put it to one side on your bike and you’ll
know that that’s the punctured one. Right before we go and put the brand-new
inner tube in, we want to check what has caused this puncture in the first place.
If it’s been a pinch puncture and you just hit a pothole very hard, that will be
very, very obvious. However, it’s gone down slowly and didn’t really
notice until it began to go soft. You’ll want to go around the inside of the
tire carefully with your hands. I say carefully because of course
whatever’s penetrated through your tire into the tube is likely to be very sharp,
so it could penetrate through your skin as well. So in this case, the offending
article is just a sharp thorn which I’ve just been able to get out using my
thumbnail. So once you’re satisfied that you’ve got
the offending item out of the tire, it’s time to put the new inner tube in.
And that is much more easily done if the tube has got some shape
to and it’s not just flat like this. So you’ve got a couple of options, you can
simply undo the valve again here and blow it up yourself. Or if you don’t want to do that,
you can simply attach a pump and do the same thing with that. It doesn’t
need to be too pumped up, just to give it a bit of roundness so it
fits inside the tire a bit easier. So once you’ve got the shape in the tube,
do the valve back up here. Find the valve hole on the wheel, which in
this case is here. And then simply drop the valve through it after you’ve bent the
tire backwards. Then you want to get the bead over the inner tube there at the
valve to start with, and you can start to tuck the inner tube in all the way around.
So once the tube’s bedded in, it’s time to start putting the bead back
over onto the rim. In some instances, I think possibly like on this one you can
do the whole thing by hand. However, if it’s not that easy, it’s a bit
too tight, you can simply put the tire levers up and use them to bend the bead of
the tire back on. But just be careful again that you don’t pinch the
inner tube with your tire lever . Once you’ve got it seated back on the rim
like this, we want to go around it step by step, pulling it over on the side that you
put it back on. Just to make sure that you can’t see the inner tube protruding
underneath the rim of the tire. Because if you do and you start pumping it
back up to a higher pressure it can actually explode again. So I’ve just got a
bit here where you can see the inner tube underneath the tire. So before we start to
pump it up, we want to make sure that that inner tube is firmly inside the tire.
There’s no specific technique to this . It’s just simply a case of I try to roll
it around until you can’t see the inner tube anymore on both sides. Once you’re
happy with that we can begin pumping. Right, that’s pretty hard and I reckon
that must be somewhere up towards a 100 PSI and there’s one last check that it’s
seated properly. Give the wheel a quick spin and make sure that it’s fairly smooth
all the way around. If you get any big bubbles up and down the
tire, it generally means that you’ve got your tube snagged underneath. Okay, ready
to put that in. Just do the valve up here again and we’re ready to put
the wheel back into the bike. So almost in the same way that you’ve put
it in, push the rear mech down, the cage part at the back to make sure
that’s the case. And as we’ve already put it into the smallest cog, that’s where you
want to rest the top jockey wheel. It should just slip in. Okay, before you
set off just give a quick bit of peddling, making sure that the chain’s still seated
properly on both the chain ring and the cogs at the back. You might even want to
put it up a few cogs if you’re starting back on a climb like I am before we get
going. Then it’s just a case of clearing your rubbish and your tools up. One last thing, though, before you get on
your way, if you have loosened your cante lever brake off to get your wheel out,
make sure that you do it back up.

Only registered users can comment.

  1. GCN videos, always interesting, informative, and usually funny! Thank you guys. I always look forward to your next video.

  2. 3:20 You should NEVER use a tyre lever to get the tyre back on the rim. It is all to easy to simply pinch puncture the new inner tube with the lever. I worked in a bike shop with Cytech qualified mechanics and they were adamant about this.
    The real solution:
    If you are struggling to get the last section of tyre back on the rim, go to the opposite side of the wheel and make sure that the bead is seated as deep into the rim as it will go. The extra 1mm provided will give you the freedom to push the remainder of the tyre on to the rim with your thumbs.

  3. I have an idea for video! I belong to the kind of people that almost exclusively ride tubulars. I have many reasons: comfort, security, weight, performance, its cool, I like the smell of glue, some tubular wheels are cheaper, etc.. So, why don't do a vid on puncture repair for the tub-folks? (I don't find them to be particularly cumbersome but nonetheless, I might have missed some tips and tricks.)

  4. Ran over a bloody pothole while I was looking back at my friend. Blew out my inner tubes and I had to walk all the way back home. Luckily it was just 10 km.

  5. Not likely (or fun) with a small hand pump, but when using a floor pump, it helps if you pump the new tube (inside the tire/tyre) up halfway and then deflate it before pumping to full pressure. This allows the tube to even itself out lengthwise and will pull itself out from under the bead if it caught.

  6. When replacing the tyre leave the bead at the valve stem till last as this will avoid the tube being pinched push valve stem in but not all the way through so that you can reseat the bead without pinching tube at stem fixing.

  7. Love your videos, lots of good tips for a 59 year old hobby cyclist.
    I have taken part in Nordsjøritt in Norway twice (2013 & 2014) and plan to do so again this year and am always on the look out for a good small pump to have with me on training runs and in the nordsjøritt. I see you have a BikeHut Travelling Track Bike Pump in the video and was wondering if you recommend it?  

  8. Showing in this video very obviously; The bold and cap on the valve are not installed. In case you have a blowout, your inner tube will be able to detach from the rim, preventing a nasty crash (if avoidable at all).

  9. Man, i hate buying tubes. Does anyone have suggestions for a good, reliable tube?
    Was looking for a Conti Race 28 Light, but im not really sure because it recieved some really bad reviews. :/

  10. what pressure should a 23-622 road tire have ? i manage to get it pretty hard with my hand pump, but i can still push 3mm inwards with my thumb afterwards…

  11. These videos make it look so easy, but I've gone through two tubes already trying to replace the last one. I'm embarrassed to go back to the bike shop because I've been there once a week lately it seems. Frequent flat syndrome. But no one can ever figure out why it happens. I ride partially in the city where there is a lot of construction debris and I'm just unlucky I guess.

  12. I must say thanks to this gcn maintenance video i was able to kom my flat repair! i had alot of practice today with two flats within 5 miles!

  13. i forgot on what gear i removed the bike tire. can i just put it back gain anywhere? newbie here hope someone can help.

  14. Hey guys great video just wanna ask something about my Maxxis MTB tyre.I just got a new inner tube but the tyre itelf has a couple of holes,so I be concerned I'd yes I m buying a new tyre( ^ω^)

  15. my tires held up for 3 years, and had my first flat today.. and thanks to your videos i was able to change it quickly and get back on the road. <3 GCN

  16. My back tire held up for 10 years I finally got a flat last Saturday. I was going to take it to the shop to get it changed but watching this video I see it is not hard to change the tire, I already got the tube out need to buy a new one.

  17. I KEEP destroying my inner tunes because my tire is SO tight, wth can i do? Impossible to do with just hands

  18. Thanks for this video! I had a puncture on the way home last night which I fixed in 5 minutes, but then spent the best part of an hour trying to balance the tyre to no avail. Watched this video when I got home then fixed it properly in 5 mins 🙂

  19. I need help with a problem. I've got a HopRider 300, I found a little tear on the outer back tire, probably going over glass. I can't take off the tire because it's part of the bike, any advice?

  20. The only part I struggle with is putting the tyre back on. Although I have only been riding for about 7-8 months.

    (I'm 14 and 5th at national level. So I'm not a scrub if your wondering)

  21. Helpful video as always.

    I'm told that not keeping/using the dust cap falls into Matt's unwritten rules, but I also get a nut on the thread of the valve of the inner tubes that I buy.

    It seems like this should go on the outside of the rim, but not really sure?

  22. rite, so off to the bike store i go lol. Great video though, that whole process just seems like a little to much for me 🙁

  23. Hello, what if I just simply bumped on a small speed bump and there was no objects around that could really puncture my tire, but it's still flat should I do this?

  24. getting rid of the flat tire isn't "fixing it". You only showed how to take the tire off, remove the tube (which everyone fuckin knows) & replace it with a new tube. You did NOT show how to fix the flat one. 😬

  25. Wow that's actually very simple. Before watching this video I'd be completely stumped by a flat tyre.
    Cheers GCN!

  26. Best video on youtube! You make me realise how quick and simple it can be when you're half way from work with a puncture praying to God for help. Thanks a lot!

  27. thats not fixing its called replacing 🙂 fixing is something different and its not in this video

  28. I have an invention to make it possible to fix the puncher front or back tyre in 15 sec without any effort. If anyone here is in manufacturing or like to help to promote it then please send me your contact. I also have design for a revolutionary gear system that would change cycling and also a new idea for a mountain bike that has never been thought of even. Manufacturers and companies never ever reply. I have given up.

  29. I swear you are supposed to replace the tire or you will just get a puncture again from friction on the road to the tube

  30. Just had my first flat the other day near the end of a 48 mile ride. Glad I watched this video first. I did everything the way they recommended and was back on my bike in no time flat (pun intended)

  31. You don't have to worry if you have slime in your tyres it can seal punctures to a size of three mm problem solved I had it in my mountain bike and it worked wonders planning on putting it in road bike when I get it too

  32. These videos where they take the tires on and off (partially or fully) make it seem easy enough, and then I'm absolutely never able to do it. My hands get raw really quickly trying to do it. It's a disaster. Dunno if it's me or my gear

  33. How to fix a flat tyre is fine but how about doing a video when you are on a country road it's pitch black and pissing down with rain I would like to see a video on that as this is normally when these punctures happen.

    This happened to me recently and lucky I have a rechargeable mini headlamp in my bike maintenance kit so I was able to do the work on a pitch black road hands free.

  34. I have changed a hell of a lot of tires in my life but these Specialized armadillos have me beat. Theirs no way I can just squeeze it on like he did. They're way to tight. The tire is a 700 size road bike. After an hour I final got it on only to discover I had cut the tube. lol Does anyone know a trick to get the tire on the rim.

  35. Hi Had my first flat today caused by a pot-hole, I got the tube replaced and back in and then made it back home. Looking at the tyre when I got home the tyre does not seem to be sitting central in the rim, the tyre middle line is moving between the left and right side of the wheel.
    Is there an easy way to centralize the tyre on the rim?

  36. Got my first flat today (back wheel, argh), I memorised this and the other GCN puncture vids. Went through every step and completed the task, however my new inner tube got a puncture almost instantly… I forgot the first rule you taught – check for a thorn in the tyre. Post-mortem revealed it was indeed a rather large thorn.

  37. Thanks.  I came off my bike for the first time a couple of weeks ago and enjoyed my first flat around Lake Burley Griffin today.  I should've been more prepared as I had to walk > 5k's back to get home.  Will be better prepared once I fix the flat! 🙂

  38. Now I'm gonna remove the tube inside my bike again, since it's going up and down, the tube was not properly placed, I thought my rims and spokes was misaligned somehow, but it's not. Thank you GCN!

  39. Was having a great ride and 19 miles away from my house and got a flat….wished I watched this video sooner. But will be be prepared if it happens again.

  40. A basic flat tire lesson that is fundamentally correct. Conveniently correct? No. There is one more thing you should have with your tire tools, tube and pump. A pair of 'surgical' style disposable rubber gloves. Few of us mortals have wheels, derailleurs and chains that are clean. The gloves take up virtually no space and will let you continue your ride without greasy grime coating your palms, thumbs, fingers, handlebar tape, and cycling shorts.

  41. Thank you! Got my first flat yesterday, but luckily was able to get back home. Today (at home) I calmly replaced the flat tire with a new inner tube after I watched this video.

  42. I was three minutes off campus when I found that thorn you spoke of and was so glad I'd seen this video. Thanks.

  43. The title is misleading. The video should have been titled ' How to replace a bicycle tire's inner tube' or so, because that's what it does. This does NOT show how one can actually fix a puncture using a puncture kit – this involves patching the punctured tube and there is no need for a new tube.

  44. I noticed that like every other video on YouTube edited the part where you actually put the when back on. You cut the video three times to make it seem easy……….. Be real

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