Road tubeless tyres, where and how much?

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DKay
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Re: Road tubeless tyres, where and how much?

Postby DKay » Sat Feb 28, 2015 17:57 pm

munkster wrote:
Speaking from personal eperience, fitting tubeless MTB tyres is a doddle compared to to certain combinations of road tubeless tyres and rims. SL23 rims are notorious for being a bugger.


I'm very much looking forward to this battle (NOT!) :cry:


You may find it easier, maybe not. Maybe I'm just crap at fitting tyres, although I've done it plenty of times before without any issues. It probably didn't help that I was fitting the tyres in a cold room.

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thegibdog
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Re: Road tubeless tyres, where and how much?

Postby thegibdog » Tue Mar 03, 2015 13:14 pm

How do Schwalbe Ones size up? Got some Michelin Pro4 SCs in 25mm and they come in at about 27mm on Ultegra wheels and I don't have enough clearance for them.

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ugo.santalucia
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Re: Road tubeless tyres, where and how much?

Postby ugo.santalucia » Tue Mar 03, 2015 13:22 pm

thegibdog wrote:How do Schwalbe Ones size up? Got some Michelin Pro4 SCs in 25mm and they come in at about 27mm on Ultegra wheels and I don't have enough clearance for them.


My ONE 25 on 25 mm wide rims (20 internal) come at 28 wide and 25 high

DKay
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Re: Road tubeless tyres, where and how much?

Postby DKay » Tue Mar 03, 2015 14:23 pm

thegibdog wrote:How do Schwalbe Ones size up? Got some Michelin Pro4 SCs in 25mm and they come in at about 27mm on Ultegra wheels and I don't have enough clearance for them.


Tubeless 23s come up at 24mm wide on my 23mm Archetypes. Tubeless 25s come up at 26mm wide on my 24mm SL23s.

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thegibdog
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Re: Road tubeless tyres, where and how much?

Postby thegibdog » Tue Mar 03, 2015 18:26 pm

Cheers, so I'm guessing they'd come up taller than 25mm on standard rims.


Carbonator

Re: Road tubeless tyres, where and how much?

Postby Carbonator » Mon Mar 09, 2015 09:56 am

^Going to try some of those.

How are tubeless tyres when taking in a plane? Do you have to deflate them fully and then re seal/fill on arrival, or can you keep enough pressure to keep sealed?

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ugo.santalucia
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Re: Road tubeless tyres, where and how much?

Postby ugo.santalucia » Mon Mar 09, 2015 10:42 am

Carbonator wrote:^Going to try some of those.

How are tubeless tyres when taking in a plane? Do you have to deflate them fully and then re seal/fill on arrival, or can you keep enough pressure to keep sealed?


If you keep 20-30 PSI they should stay on the rim no problem

Carbonator

Re: Road tubeless tyres, where and how much?

Postby Carbonator » Mon Mar 09, 2015 11:57 am

Thanks. Thats what I thought/hoped.

Any idea what the max pressure increase would be from say 25psi on a 23mm tyre whilst in the hold of a plane?
Are they likely to get anywhere near 120psi?

Do you run tubeless road tyres at the same pressure you would run tubs and clinchers?

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ugo.santalucia
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Re: Road tubeless tyres, where and how much?

Postby ugo.santalucia » Mon Mar 09, 2015 12:06 pm

Carbonator wrote:Thanks. Thats what I thought/hoped.

Any idea what the max pressure increase would be from say 25psi on a 23mm tyre whilst in the hold of a plane?
Are they likely to get anywhere near 120psi?

Do you run tubeless road tyres at the same pressure you would run tubs and clinchers?


You can probably calculate it, assuming the air pressure in the luggage hall is the same as outside, then look for pressure at 37,000 feet, divide sea leve pressure by that and you get a coefficient to multiply your tyre pressure... should climb up to a 100 PSI equivalent... but I suspect even the luggage area is pressurised to an extent, otherwise all liquids in the bags would pop...

I use much lower pressure. Schwalbe ONE 25 at 75 PSI

cattytown
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Re: Road tubeless tyres, where and how much?

Postby cattytown » Mon Mar 09, 2015 13:14 pm

Think about it. Air pressure at sea level is only about 14 psi. That puts the max relative increase at about 14 psi...

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ddraver
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Re: Road tubeless tyres, where and how much?

Postby ddraver » Mon Mar 09, 2015 15:30 pm

The numbers are so small as to be irrelevant Carb...
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dodgy
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Re: Road tubeless tyres, where and how much?

Postby dodgy » Mon Mar 09, 2015 15:38 pm

Carbonator wrote:Thanks. Thats what I thought/hoped.

Any idea what the max pressure increase would be from say 25psi on a 23mm tyre whilst in the hold of a plane?
Are they likely to get anywhere near 120psi?



Nowhere near. The altitude difference from (say) 0 feet to a cruising altitude of (say) 35000 feet, means that approximately, your tyres will behave like they have an extra 10psi or so in them.

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ugo.santalucia
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Re: Road tubeless tyres, where and how much?

Postby ugo.santalucia » Mon Mar 09, 2015 16:56 pm

I am not sure your maths are correct. Basically what you are saying is that going in the absolute vacuum of space only brings a differential of 14 PSI, which is the difference between zero pressure and 1 Atm... so what's the need for space suits and stuff? A respirator and sun cream would be plenty... :lol:

I think you need to multiply rather than add... :roll:

cattytown
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Re: Road tubeless tyres, where and how much?

Postby cattytown » Mon Mar 09, 2015 17:03 pm

The need for space suits is to make sure you have something to breathe, and that with no pressure your bodily fluids don't boil. Small variations in pressure can make quite a difference to boiling point.
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ugo.santalucia
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Re: Road tubeless tyres, where and how much?

Postby ugo.santalucia » Mon Mar 09, 2015 17:15 pm

cattytown wrote: Small variations in pressure can make quite a difference to boiling point.


And to the volume and pressure of gases. I am not sure measuring the difference between internal and external is the way... I think it is the ratio between internal and external pressure what matters

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dodgy
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Re: Road tubeless tyres, where and how much?

Postby dodgy » Mon Mar 09, 2015 17:21 pm

ugo.santalucia wrote:I am not sure your maths are correct. Basically what you are saying is that going in the absolute vacuum of space only brings a differential of 14 PSI, which is the difference between zero pressure and 1 Atm... so what's the need for space suits and stuff? A respirator and sun cream would be plenty... :lol:

I think you need to multiply rather than add... :roll:


I think he's about right, I made a stab at about 10psi. I think you forget that aircraft, including cargo areas, are pressurised.

If this really was a problem, we'd be adjusting PSI when climbing in Colorado. Because 10000 feet is about the same pressure equivalent in an aircraft cruising at 35000 feet.

cattytown
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Re: Road tubeless tyres, where and how much?

Postby cattytown » Mon Mar 09, 2015 17:29 pm

1ATM <> 14 PSI, the pressure at sea level. Absolute vacuum is 14 psi less (zero). A tyre inflates to 100PSI is app 115PSI above zero.

I think you are overthinking it. It's not a logarithmic scale like sound pressure.

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maddog 2
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Re: Road tubeless tyres, where and how much?

Postby maddog 2 » Wed Mar 11, 2015 07:11 am

just get them to fly low, if you are concerned.


I just knock them down to 50ish psi for flying. They stay seated and never had any issues.
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Carbonator

Re: Road tubeless tyres, where and how much?

Postby Carbonator » Fri Mar 13, 2015 10:10 am

Cheers guys.

Do you have to use mounting fluid or is that just if tyre is difficult to get on the rim?
Could you not just use some of the sealant?


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