All the gear, no idea.......new tubs.

San Marzano

I am very lucky to have been a donated a carbon wheel-set.

The only pitfall is that they are tubs. The thought of puncturing in the peaks on my own, late night on a summer ride is a bit intimidating to say the least.

From what I’ve been told you need to take an ‘old’ pre-glued tub as your spare, carefully peel off the glued tyre once flat and then put the ‘old’ tub on, inflate and you’re away.

Is this correct? How come the replacement tyre doesn’t need to be glued on like the flat one was? The one at the moment seems very secure around the rim.

Does that make sense?

Thanks in anticipation.

drlodge

The "dried" glue on the replacement tub will stick enough to the old glue already on the rim. You can decide whether it is worth removing and re-gluing the replacement tub once you get home depending on how hard you ride.

San Marzano

Thanks mate, appreciate that.

Pumpkin Positive

also less likely to puncture in the first place as I understand.

earth

There are various tyre sealants that you can take as well. You might be limited by whether your tyres have removable valve cores.

napoleond

They're arguably easier to change than a clincher.

Pross

You could always take some tub tape with you too. It doesn't stick a tub as well as glue but will give a bit more security for getting you home.

JayKosta

With tubs (sew-ups), I carry 2 spares - 'just in case..'

New tubs can be very difficult to mount on a rim. BEFORE using any glue or tape, mount the new tub on a rim to get it stretched a little - then center the tread / base tape on the rim and inflate to full pressure - let it standard that way over night.
With the new tubs that I use, I need to moisten the base tape with water to allow it to stretch enough to mount. And be VERY careful to keep the valve stem straight in the rim when mounting - if the stem gets pulled too much the innertube can be damaged.

A fully inflated tub is quite tight on a rim even without glue, just don't attempt extreme turns, etc.

Jay Kosta
Endwell NY USA

bernithebiker

earth wrote:

There are various tyre sealants that you can take as well. You might be limited by whether your tyres have removable valve cores.

I use Decathlon's sealant - 3 Euros a can, and you don't need removable valve cores. You just screw the can's nozzle end onto the valve (having undone the valve's little nipple of course!) then squirt away. Good for 100psi.

I ride about 12000km a year, all on tubs, and my puncture rate is currently 1 per year, (which the sealant sealed perfectly anyway).

San Marzano

Hi Bernie - sounds like a plan - is this just a temp' fix to get you home?
Cheers Jon

ugo.santalucia

Take a pre-glued spare, remove the punctured one, fit the good one... end of the story, the rest is nonsense and scaremongery.
If you want to use sealant, fine, but it won't fix 100% of the punctures, so to be on the safe side you do need a spare tub anyway

San Marzano

When I get home do I need to do anything with the pre-used one (now on the wheel). Does it need to be glued on any further?

Thanks

ugo.santalucia

San Marzano wrote:

When I get home do I need to do anything with the pre-used one (now on the wheel). Does it need to be glued on any further?

Thanks

typically not. Try to displace it with your thumbs when still inflated... if it doesn't bulge, leave it alone

bernithebiker

San Marzano wrote:

Hi Bernie - sounds like a plan - is this just a temp' fix to get you home?
Cheers Jon

No, it's a proper fix that lasts the lifetime of the tyre.

You just need to top the pressure up when you get home.

And, the icing on the cake, you are henceforth protected* against future punctures because you now have latex in your tub!

*not 100%!

sancho_panza

bernithebiker wrote:

I use Decathlon's sealant - 3 Euros a can, and you don't need removable valve cores. You just screw the can's nozzle end onto the valve (having undone the valve's little nipple of course!) then squirt away. Good for 100psi.

I ride about 12000km a year, all on tubs, and my puncture rate is currently 1 per year, (which the sealant sealed perfectly anyway).

you're my inspiration - gonna do the same. Works on latex inners? Riding in France and Switzerland I think the puncture hazards are fewer anyway.

I ride the same distance, have just switched to tubs and will be on them full time - I have a spare but if there's a simpler solution then I'll use it.

FSR_XC

I carry this with me just in case:
http://www.tufo.com/tufo-tyre-sealant/

Never had to use it in anger yet.

drlodge

bernithebiker wrote:

earth wrote:

There are various tyre sealants that you can take as well. You might be limited by whether your tyres have removable valve cores.

I use Decathlon's sealant - 3 Euros a can, and you don't need removable valve cores. You just screw the can's nozzle end onto the valve (having undone the valve's little nipple of course!) then squirt away. Good for 100psi.

I ride about 12000km a year, all on tubs, and my puncture rate is currently 1 per year, (which the sealant sealed perfectly anyway).

What tubs are you using out of interest and are you riding these through the winter months? I'm very wary of my tubs getting cut up, since the Open Paves I tried on my other wheels cut up quite badly on just a few rides. Got Corsa EVO CX IIs on my 50mm carbon wheels and really don't feel like riding them on anything except bone dry and clear roads.

earth

bernithebiker wrote:

San Marzano wrote:

Hi Bernie - sounds like a plan - is this just a temp' fix to get you home?
Cheers Jon

No, it's a proper fix that lasts the lifetime of the tyre.

You just need to top the pressure up when you get home.

And, the icing on the cake, you are henceforth protected* against future punctures because you now have latex in your tub!

*not 100%!

Another benefit I found is that the latex inner tube in the tub holds air for longer after sealant has been used.

cougie

Pumpkin Positive wrote:

also less likely to puncture in the first place as I understand.

Not from my experiences - but I've just been massively unlucky on tubs. Even with sealant.
And massively lucky on normal tyres.

Now this sealant thing - we ride tubs because they're the fastest riding tyres. And then we bung sealant inside them ? Hmmm.

bernithebiker

drlodge wrote:

bernithebiker wrote:

earth wrote:

There are various tyre sealants that you can take as well. You might be limited by whether your tyres have removable valve cores.

I use Decathlon's sealant - 3 Euros a can, and you don't need removable valve cores. You just screw the can's nozzle end onto the valve (having undone the valve's little nipple of course!) then squirt away. Good for 100psi.

I ride about 12000km a year, all on tubs, and my puncture rate is currently 1 per year, (which the sealant sealed perfectly anyway).

What tubs are you using out of interest and are you riding these through the winter months? I'm very wary of my tubs getting cut up, since the Open Paves I tried on my other wheels cut up quite badly on just a few rides. Got Corsa EVO CX IIs on my 50mm carbon wheels and really don't feel like riding them on anything except bone dry and clear roads.

Normally I use Vittoria Corsas (the newer ones aren't called 'EVO' anymore), but I'm trying out some Mavic Griplink/Powerlink (front/rear) at the moment, as hopefully the front will have extra grip in the winter.

I use tubs all year round.

bernithebiker

cougie wrote:

Now this sealant thing - we ride tubs because they're the fastest riding tyres. And then we bung sealant inside them ? Hmmm.

Firstly, I think the jury's out on whether or not tubs are 'faster', as tyres.

I ride them because, a) they are much more comfortable than clinchers, and b) the package, (wheel/tyre) is far lighter than clinchers.

The sealant isn't going to change very much - it just puts a layer a few microns thick inside the tube.

earth

cougie wrote:

Pumpkin Positive wrote:

also less likely to puncture in the first place as I understand.

Not from my experiences - but I've just been massively unlucky on tubs. Even with sealant.
And massively lucky on normal tyres.

Now this sealant thing - we ride tubs because they're the fastest riding tyres. And then we bung sealant inside them ? Hmmm.

I was thinking that as well and there is a weight penalty but I can't tell much difference. But I
it's more that a few microns coating the innertube. With most sealants you put about 30 ml in or more on a 23mm tyre.

bernithebiker

earth wrote:

cougie wrote:

Pumpkin Positive wrote:

also less likely to puncture in the first place as I understand.

Not from my experiences - but I've just been massively unlucky on tubs. Even with sealant.
And massively lucky on normal tyres.

Now this sealant thing - we ride tubs because they're the fastest riding tyres. And then we bung sealant inside them ? Hmmm.

I was thinking that as well and there is a weight penalty but I can't tell much difference. But I
it's more that a few microns coating the innertube. With most sealants you put about 30 ml in or more on a 23mm tyre.

True, but most of that 30ml is water, which will evaporate over time; how about less than a mm?!