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Tech Page -How to install tubeless tyres and fix them.

How to install tubeless tyres and fix them.

Easy really. 2 layers of tubeless rim tape need to be fitted. Some rims require more so the chosen tyre is a tight fit. Tape must be fitted with no kinks or bubbles.

Install valve and tap it home with a rubber mallet. Secure the valve collar with pillars if you have too. A common source of leaks is the collar working loose with time. 

Using a sponge to coat the base tape with soapy water helps (liquid detergent and water mix) the tyre inflate easily. applying this is not shown in the current video.

Install tyre. If you are not me you might need tyre levers. Flat one's must be used. IRC (these are the best ones), VAR RP42500, Park Tool TL4.2 or Campagnolo tyres levers are all suitable. Metal levers or traditionally shaped lever should not be used or damage to the tyre or rim may result.

Remove valve core and drain/inject 30ml of latex sealant through an open syringe.

This video shows it all. 

Fixing tubeless tyres.

There is alot of fear about tubeless tyres but in reality, they are the easiest tyres to live with.  As not all tyres are created equal, tubeless tyre choice is important but the majority of tubeless issues, are user error - simple as that. Below is a guide to avoid user error. I have worked this all out by trail and error (alot of error on my part as well). 

First of tubeless tyres should be run with sealant. Some insist on riding without sealant. Riding without sealant can be done on proper UST rims and with a few tubeless tyres, but I would not do it, too much flint in Suffolk to take that risk. There are many brands of sealant, Orange Seal, Stan's no tubes, Effetto mariposo, Zefal, DT Swiss, Schwable even IRC do one. They all work in similar way. The latex is in solution and mixed in are particulates so when you puncture the sealant is forced into the hole and and the particulates fill the hole that the latex sticks to causing a plug to form. Using CO2 on your tubeless tyre with sealant in can cause problems though.

Stans for example will turn in a white watery liquid when CO2 is used which is about as useful as chocolate teapot, in fact less useful, I can eat a chocolate teapot. If you use CO2 to inflate tyre just mounted and there was sealant already present, add more sealant through the valve core, the tyre should remain locked to the rim so you can then inflate with a track pump.

Most brands of sealant I have tried do not mix well with CO2 a few claim to though. 

Of course, because CO2 causes the sealant to separate it can actually help seal a hole that won't seal. I have used this trick before then added more sealant when I get back home.

Sealant dries out slowly. It needs to be topped up. I use Effetto Mariposo or MaXalami MaXSeal sealant now mainly because with CO2 it does not turn into a watery liquid, and both these sealants don't ball up like Stans's and are reasonably durable. I top up my IRC tyres every 3 months or so, or when I feel it needs it. If I am being honest I normally find out I need to add sealant if I get a puncture that seals only at low pressure. That is the sign I have left it too long. 30ml in a road tyre is sufficient. I drain sealant through the valve core through an open syringe with gravity or inject. I don't bother checking how much sealant is in the tyre normally, I just pour some in because I normally leave it long enough there is little in the tyre. You can't overfill the tyre, don't worry about that and there is no need to clean old sealant out with either of these two brands (same applies to oranage seal I believe).

If you keep the sealant topped up you will find it will seal most punctures (if not all) pretty quickly. You can get a fair bit of air loss but even if you drop to 30 psi you can still ride on that. So you can stop and faff with a small pump or continue riding and use a track pump at home. I have done the latter as I don't often have a pump with me, I'll come to that later. This is the problem with 23mm tubeless tyres. The air volume is small and therefore the pressure drop is large before the tyre seals. Bigger tyres can seal at a higher pressure due to the larger air volume. This make larger tubeless tyres more practical. I consider 25mm the minimum size for a tubeless tyre for this reason alone. 

Sometimes, however, the sealant just can't seal the hole. Most of the time that is because there is insufficient sealant in the tyre but sometimes it is because the hole is too big. 

There are a few reasons why the sealant does not always work. One is using compressed air to inflate the tyre when there is sealant inside. This causes the fluid too begin seperating sooner than you would like. 

At the point of the sealant not working many people get out that spare tube and faff trying to get the tyre off, fit a tube while getting sealant every. Then swear alot and ruin their thumbs trying to get the tyre back on again. No wonder some give up on tubeless tyres after that. There is a solution though. In my back pocket is Loctite flexible superglue and normally Maxalami tyre worms (there are other brands too). The worms are fibrous strings with tacky butyl rubber that come with an applicator. Before the tyre goes flat you place the worm with the middle in the applicator and shove it into the hole. The Maxalami kits offer two sizes of worms for different size holes. Make sure the worm is properly inserted and watch the video showing you how. This will plug the hole and the excess worm does not have to be trimmed. The excess will flatten off and disappear into the road with in a few km. Sometimes a worm by itself is not always enough to seal at high pressures (this has been the case when using small worms in big holes). If this is the case get the flexible superglue out. Smear that over the worm and hole. Let it set then inflate. I would be wary about inflating to very high pressure straight away. I would put enough air in to get me home and no more. When you get home you will want to trim the worm if the excess has not gone gone already and you can then make sure there is enough glue covering the hole before trying higher pressures. Remember a 25mm tubeless tyre is run at not more than 90 psi anyway.

Worms csn be a permanent fix. I have ridden for 1000's of km on tyres fixed with them. 

Sidewall cuts can be dealt with using the flexible superglue or worms. I would try the flexible superglue first on small cuts/holes.  you may not be able to hold high pressures but you can get the tyre to hold enough air to get you home. One sidewall cut I got when riding my IRC's off road on a damp dark night (asking for trouble) was fixed this way. Initially it could only hold air for a couple of hours at 60 psi but I kept on applying the glue and after a week  it could hold 80 psi indefinatley and the tyre did another 3000km without issue. As it was a 28mm tyre, 80psi was more than enough as I run those at 70 psi. If the flexible superglue does not work then try the worm. 

Tubeless tyres can be repaired if they have a butyl or latex lining. IRC's tyres do, many other do not though. If you have a proper lining then you use a inner tube patch and vulcanising rubber glue to seal the inside of the tyre. For tyres without a lining you may need your superglue again to get the patch to stick. You can do this if your plug/superglue fix starts leaking air. There are tubeless patches too. these are often too big for road tyres but are thicker and will reinforce the tyre casing. The tyre has to be removed though so see if the external fix works first.

So what you dont do is fit a tube to fix a puncture issue with tubeless tyres. If you carry a tube ask your self why, the hint is in the name TUBELESS!!!!!

What I carry;

When I am commuting on the commuter bike with two big panniers I have tyre worms, flexible superglue, a pump, CO2, valve core remover and a 2oz bottle of sealant. 

When riding my race bikes I just carry flexible superglue, worms and CO2 and that's for 200+ mile rides as well. For long TT's I carry nothing mainly because my skin suit has no pockets. To deal with a puncture on the race bike I would first see if it seals, if it does even at a low pressure I wont stop and top up with air. I will only get the worms out and CO2 if I loose so much air that I simply cannot continue. 30 psi for a 82kg rider is enough. I have ridden 100 miles like that and simply inflated with a track pump when I found a bike shop. 

The thing is even if I carry what I do on the commuter bike it still takes up less space than tubes and levers. I do not carry a tube or tyre levers. As far as I am concerned my tubeless tyres once fitted will remain on the wheel until they are worn out, unless I have to patch it which thankfully I have had to do only once. 

So I hope that helps answer questions about riding with tubeless tyres. I have given up on clinchers with tubes and won't be switching back.