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G'day, just got a set of second hand internal beadlocks, how do you use them??
Bit confused on air pressures etc. If the tyres are at 30psi, the beadlock is at 30psi, If I drop the tyres down to 10psi the beadlock goes down to about 15psi, do i then have to air up when i air down??
Drop the tyres to zero, and the beadlock goes to about 10psi, so wouldnt hold the bead!!
If i pump the beadlock up to 30psi when the tyres at 10psi do i need to let air out of the beadlock when i pump the tyre up??
On the weekend tested them out, dropped the tyres to 10psi, beadlocks at 15psi and i got crap in the bead so now have a slow leak
Any help appreciated.
Thanks
Leeham.
Bloody IFS bugger who slows down the SAS boys.
www.vickrawlers.com
Leave the beadlockd pumped up to 45-50 psi and do what you like with the other pressure.
The reason a lot of people reckon you get crap in the beads anyway is because of the (now VERY much outdated) idea the beadlocks need to be kept to 5 psi aboube the other pressure. This was the original idea put forward by Staun years ago and is now NOT recommended by them.
Most fitters and Staun themselves now recommend 45-50 psi.
George Carlin, an American Comedian said; "Think of how stupid the average person is, and realise that half of them are stupider than that".
bazooked wrote:the internals have to run at 50 psi, if they r dropping while ur airing down they have not been fitted correctly or they are leaking.
Just to clarify - The internal beadlock pressure and tyre pressure work hand in hand. They affect eachother as the internal beadlock is contained within the air pressure/ volume of the tyre. If you drop the tyre pressure by 20PSI you will notice a large drop on the internal as the tyre pressure is the larger volume of air and impacts ther most.
For this reason, if you wanted to drop your tyre pressure down to 10PSI, drop it a little more initially and pump the internal back up to the 45PSI. You'll find that the tyre pressure will increase a little as you are still putting air into the tyres overall volume, albeit contained within a tube and bag.
Be careful if you have been out playing with 10PSI in the tyre and 45-50PSI in the internal. If you go to blow the tyre back up you'll need to let a little air out of the internal as you are pumping the tyre up.
Ryano wrote:
Just to clarify - The internal beadlock pressure and tyre pressure work hand in hand. They affect eachother as the internal beadlock is contained within the air pressure/ volume of the tyre. If you drop the tyre pressure by 20PSI you will notice a large drop on the internal as the tyre pressure is the larger volume of air and impacts ther most.
For this reason, if you wanted to drop your tyre pressure down to 10PSI, drop it a little more initially and pump the internal back up to the 45PSI. You'll find that the tyre pressure will increase a little as you are still putting air into the tyres overall volume, albeit contained within a tube and bag.
Be careful if you have been out playing with 10PSI in the tyre and 45-50PSI in the internal. If you go to blow the tyre back up you'll need to let a little air out of the internal as you are pumping the tyre up.
Cheers,
Ryano
I figure with 45psi in the beadlock this effect will be lessened as the innertube wil be fairly compressed againt the canvas inner at this pressure, when playing with the lower pressure in the inner i was chasing my tail trying to get the pressures where i wanted. There is definatly a bit of an art to getting these things right.
thanks again, will try procomp to get em checked.
cheers
Leeham
Bloody IFS bugger who slows down the SAS boys.
www.vickrawlers.com
Ryano wrote:
Just to clarify - The internal beadlock pressure and tyre pressure work hand in hand. They affect eachother as the internal beadlock is contained within the air pressure/ volume of the tyre. If you drop the tyre pressure by 20PSI you will notice a large drop on the internal as the tyre pressure is the larger volume of air and impacts ther most.
For this reason, if you wanted to drop your tyre pressure down to 10PSI, drop it a little more initially and pump the internal back up to the 45PSI. You'll find that the tyre pressure will increase a little as you are still putting air into the tyres overall volume, albeit contained within a tube and bag.
Be careful if you have been out playing with 10PSI in the tyre and 45-50PSI in the internal. If you go to blow the tyre back up you'll need to let a little air out of the internal as you are pumping the tyre up.
Cheers,
Ryano
I figure with 45psi in the beadlock this effect will be lessened as the innertube wil be fairly compressed againt the canvas inner at this pressure, when playing with the lower pressure in the inner i was chasing my tail trying to get the pressures where i wanted. There is definatly a bit of an art to getting these things right.
thanks again, will try procomp to get em checked.
cheers
Leeham
Less than about 25 psi in the tyre and there is very little difference made to the beadlock pressure, particularly if the beadlock is at about 45-50 psi, as the beadock tube is pretty much being compressed into all the nooks and crannies of its cover.
Going from 20 to 35 psi in the tyre (airing up) does have an effect, and it is worth checking the beadlock. I've generally found there is about a 3:1 change in pressure (certainly not 1:1 as you would expect...), for every 3 psi in the tyre the beadlock goes up about 1 psi. This ratio may change with different sized tyres.
George Carlin, an American Comedian said; "Think of how stupid the average person is, and realise that half of them are stupider than that".
Used everything from 8 psi up in the tyres with 45 psi in the beadlocks with no issues (mud, sand, and rocks...). Having said that I am probaby not as heavy as a GQ/GU/80/100 fully loaded, and may not have been able to exert the sort of lateral "dislodgement" forces on the tyres as they can.
George Carlin, an American Comedian said; "Think of how stupid the average person is, and realise that half of them are stupider than that".
