part worn tyres

nobbysn*ts

Iceweasel wrote: »

Too many people fail to differentiate between remoulds which are perfectly legal on cars and re-treads which are legal only on goods vehicles.

Back in the day there were lots of small 'factory in a shed' type of places which produced dodgy retreads for cars which 'unpeeled' and the public became rightly cautious, and re-treads got a bad name.

Nowadays there is great confusion between the two and there are even remoulds wrongly advertised as re-treads, by dealers who haven't a clue what they are selling.

And some people swear blind that they are one and the same thing.

A car tyre can have 2 lives - but an HGV tyre can have up to 4 lives - one from new, then the tread is re-cut, next the carcass is re-treaded, and lastly the re-tread is recut.

What do you think a re-tread is?

colino

Iceweasel, I would count myself in the group then that is confused by that terminology if it assumes a difference. I did a bit of work with an Italian based company that rework tyres. Only in the UK do they call them remoulds, everywhere else they are called retreads. After all, the tyres are inspected, tread buffed off a new strip fitted, moulded and cured onto the carcass, the sidewalls and interior are hardly touched.

Iceweasel

A retreaded tyre has the original sidewall markings left untouched and has a hoop or band of new rubber fixed to the buffed down old tread area only. This process is illegal on car tyre sizes.

A remould tyre has fresh rubber applied all over the casing so that the sidewalls also have a new surface and can bear the new brand name.

The clue is in the name - a re-tread has only a new tread.

A remould has a completely new all over covering of rubber applied in a mould.

In theory a remould is as good as a new tyre as before being put into the mould the whole thing (sidewalls and all) is buffed down until it looks just like the original carcase of a first life new tyre.

The above is the difference in English.

In Italian the words Pneumatico Rimodellare could well be used for either type of re-manufactured tyre.

The German term Runderneuerte Reifen can also be used for both.

I'm sure that in every country the factories that do this work have both types.

If we called them 're-made' or 're-worked' tyres then it might be simpler - but it's probably toolate for that.

A bit like flammable and inflammable - a very confusing language English.

Joe_Horner

colino wrote: »

Iceweasel, I would count myself in the group then that is confused by that terminology if it assumes a difference. I did a bit of work with an Italian based company that rework tyres. Only in the UK do they call them remoulds, everywhere else they are called retreads. After all, the tyres are inspected, tread buffed off a new strip fitted, moulded and cured onto the carcass, the sidewalls and interior are hardly touched.

I hink he's referring to the difference between a remould / retread and a re-cut.

Remoulding and retreading both refer, as you describe, to removing the tread rubber down to the cords and curing a new read to the old carcass.

Recutting is simply carving a worn tread deeper to get extra life from the original rubber. Obviously that requires a certain thickness of rubber to be safe, which is why it's not legal (in the UK at least) on car size tyres. HGV tyres tend to have enough rubber for it to be ok.

The problem with some of the (very) old "retreads" is that instead of curing new tread rubber on in a mould they used the pre-cure process - basically gluing a pre-cured tread strip round the outside using rubber cement. Effectively the new tread was held on like a pushbike puncture repair! That gave rise to the popular distinction between "remould" (done in a mould) and "retread" (stuck on)

Now, anything that's been "retreaded / remoulded" in the UK will have been done in a mould.

nobbysn*ts

Iceweasel wrote: »

A retreaded tyre has the original sidewall markings left untouched and has a hoop or band of new rubber fixed to the buffed down old tread area only. This process is illegal on car tyre sizes.

A remould tyre has fresh rubber applied all over the casing so that the sidewalls also have a new surface and can bear the new brand name.

The clue is in the name - a re-tread has only a new tread.

A remould has a completely new all over covering of rubber applied in a mould.

In theory a remould is as good as a new tyre as before being put into the mould the whole thing (sidewalls and all) is buffed down until it looks just like the original carcase of a first life new tyre.

The above is the difference in English.

In Italian the words Pneumatico Rimodellare could well be used for either type of re-manufactured tyre.

The German term Runderneuerte Reifen can also be used for both.

I'm sure that in every country the factories that do this work have both types.

If we called them 're-made' or 're-worked' tyres then it might be simpler - but it's probably toolate for that.

A bit like flammable and inflammable - a very confusing language English.

Oh dear. http://www.kingpin-tyres.com/ Email them and let them know.

nobbysn*ts

To help you out though, as you're obviously a bit mixed up here, it's the process they use, not what they call it. If it's a retread, or a remould, so long as it's to the correct eu standard, it's legal. I think colino has put you right.

force_ten

Retreaded Tyres

What is a retreaded tyre?

A retreaded tyre – also known as a remould – is made from a used tyre. Old tyres which are not sound should never be used as components for retread tyres. The essential building block for a retreaded tyre is a used tyre whose tread is worn-out but whose carcass (basic structure) is sound. Retreading involves stripping away both the remaining tread and sidewall of the used tyre. The final part of the process moulds new rubber to the old carcass.

What standards govern the production of retreaded tyres?
In the past, retread tyres have been manufactured in accordance with BS AU 44e. However, this standard did not specify a type approval test for retreaded tyres, which would guarantee a standard tyre quality.

On 1st January in 2004, ECE Regulations 108 and 109 came into effect, making it mandatory for retreaded tyres to be subject to a type approval test. This ensures that retread manufacturers must meet a specified basic standard in terms of the tyres’ suitability for retreading prior to the process, and their performance after it. It is now illegal to sell retreaded tyres that that do not have the “e” mark.

Are there any problems with retreaded tyres?
In the majority of cases, retreaded tyres perform satisfactorily provided the manufacturer’s guidance about maximum vehicle loadings and maximum speeds is followed. Like all tyres; overloading, sustained high speeds, and under or over-inflation all contribute to increased tyre wear and/or premature failure.

Never buy a retreaded tyre without the "e" mark.

That quote is from the ROSPA website and they are also calling retreads remoulds

I fully understand what Ice is trying to say and the method he is calling re tread is also called pre cure and it is where the tread is buffed off and a new pre formed section of tread is glued to tyre so your tread actually has a join in it where the pre formed tread meets

with a proper remould the tyre is buffed off then new rubber is built up on the tyre carcass this is then put into a tyre mould and the tread and all the side wall details are formed in the mould rather than being glued on

nobbysn*ts

force_ten wrote: »

That quote is from the ROSPA website and they are also calling retreads remoulds

I fully understand what Ice is trying to say and the method he is calling re tread is also called pre cure and it is where the tread is buffed off and a new pre formed section of tread is glued to tyre so your tread actually has a join in it where the pre formed tread meets

with a proper remould the tyre is buffed off then new rubber is built up on the tyre carcass this is then put into a tyre mould and the tread and all the side wall details are formed in the mould rather than being glued on

But ice is many years out of date. A pre cure isn't a re tread. It's just a process from a bygone age.

force_ten

nobbysn*ts wrote: »

But ice is many years out of date. A pre cure isn't a re tread. It's just a process from a bygone age.

I think you are wrong there

they still use pre cure or cold re treading for truck and bus tyres and you may also find that some aircraft tyres are cold retreaded as well, i dont think you will find a pre cure tyre to fit on a car but it is certainly not a process from a bygone age

nobbysn*ts

force_ten wrote: »

I think you are wrong there

they still use pre cure or cold re treading for truck and bus tyres and you may also find that some aircraft tyres are cold retreaded as well, i dont think you will find a pre cure tyre to fit on a car but it is certainly not a process from a bygone age

In a thread on car tyres, it's a process from a bygone age.