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Quote: Originally posted by wizard9956 on 30/3/2009

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I posted the pictures to show people what to look for when they check their tyres , who makes them isn't the point i'm trying to get across.

Why does it matter if the tyres are cheap ones ? does this mean that if you have expensive tyres you don't need to check them .

atb

Wizard

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Of course it matters if tyres are cheap ones, budget brands tend to crack up quicker than premium brands, which is the point I was trying to get across.

Obviously people need to check their tyres but it helps if they buy good quailty ones in the first place.

Quote: Originally posted by MartyM on 30/3/2009

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Quote: Originally posted by wizard9956 on 30/3/2009

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I posted the pictures to show people what to look for when they check their tyres , who makes them isn't the point i'm trying to get across.

Why does it matter if the tyres are cheap ones ? does this mean that if you have expensive tyres you don't need to check them .

atb

Wizard

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Of course it matters if tyres are cheap ones, budget brands tend to crack up quicker than premium brands, which is the point I was trying to get across.

Obviously people need to check their tyres but it helps if they buy good quailty ones in the first place.

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Quote: Originally posted by CandP on 30/3/2009

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Why would tyre pressures vary? The only difference between the plys would be the max pressure rating.
Obviously if you take a 8 ply off you should put an 8 ply back on with the same load rating.

or have I just mis-read what you have put?

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Any given weight requires a fixed volume of air to support it, in the case of a tyre, the difference in pressure is directly related to the space or volume within that tyre, the smaller the space the greater the pressure require to get it all in.

A stronger tyre construction allows more volume of air to be forced into the same space without it bursting, the stronger construction though must take space internally as the standard requires the outside dimensions of any particular sized tyre, (with the exception of 'reinforced' tyres), to remain the same

As an example a standard 165/80x13 4ply (car) tyre carries a maximum 487kg at it's max pressure of 35psi, a 6 ply of exactly the same external dimensions carries the same weight at 40psi and an 8ply at 44psi,

The reason is the internal volume of the tyre has reduced to give room for the stronger, (thicker), construction, the volume of air remains the same so requires a little more force to shove it in.

I also agree Wiz was quite right to remind us all another winter has gone by and the vans tyres another 6 month older probably stood idle suffering the elements.

I would add the tyres should be inspected off the van, not only can the inside face be better inspected but both sides seen from above will show up bulges far more clearly.

I might ask though what early year 2000 tyres are still doing on your van Wiz?

Quote: Originally posted by arc systems on 30/3/2009

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Quote: Originally posted by CandP on 30/3/2009

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Why would tyre pressures vary? The only difference between the plys would be the max pressure rating.

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Obviously if you take a 8 ply off you should put an 8 ply back on with the same load rating.

or have I just mis-read what you have put?

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Any given weight requires a fixed volume of air to support it, in the case of a tyre, the difference in pressure is directly related to the space or volume within that tyre, the smaller the space the greater the pressure require to get it all in.

A stronger tyre construction allows more volume of air to be forced into the same space without it bursting, the stronger construction though must take space internally as the standard requires the outside dimensions of any particular sized tyre, (with the exception of 'reinforced' tyres), to remain the same

As an example a standard 165/80x13 4ply (car) tyre carries a maximum 487kg at it's max pressure of 35psi, a 6 ply of exactly the same external dimensions carries the same weight at 40psi and an 8ply at 44psi,

The reason is the internal volume of the tyre has reduced to give room for the stronger, (thicker), construction, the volume of air remains the same so requires a little more force to shove it in.

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I might ask though what early year 2000 tyres are still doing on your van Wiz?

It's not my caravan mate , the owners are having them replaced after i advised them to.
Mine are 2004 tyres and i'll be changing them this year .

atb

Wizard

Quote: Originally posted by CandP on 30/3/2009

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Branded tyres are better as there is more rubber in the rubber. i.e Cheaper tyres have more fillers in them that will break down (Cost Reduction), and give them less strength.
Also branded tyres have a greater wall thickness, given greater stability and less chance of a blowout.
granted all tyres have to pass the safety regs, but why put a tyre on that just pass's? Put a tyre on that can be trusted.

Plus they are on contact with the road...Would you feel confident knowing that a plane you were in had a set of cheap remoulds on it? or would you feel safer knowing it had a nice set of fresh Dunlops on it? I know what I would prefer.

I was at a tyre manufacturer about two weeks ago due a problem with the manufacturing process on what they call the calender. I was asking the same questions to why there is a vast difference in price.

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