This should help explain them mate
What it means:
Big manufacturers (in particular Michelin and Continental) design their tyres so that the casing (basic infrastructure) can be reused. Worn tyres are collected and taken for a safety check. If they meet the quality requirements (are not damaged, not split, not too old, no puncture and worn evenly across) then they are supplied to third party companies such as Profil.
In the case of Profil, tyres are first quality checked and then the old rubber is buffed off the original casing (basic infrastructure), so new rubber can be fitted. From here onwards retread tyres are made exactly the same as brand new tyres.
In the next step they put a new premium quality rubber on the old casing (beads to beads) and put the tyre straight into a hot oven of 120 degrees for about half an hour.
The result is the retread tyres are capable of high speed ratings and good load index, comfortable thanks to the original casing, good grip from premium rubber, lower road noise due to the pattern engineered by e.g., Michelin. The E20 is the safety standard tyres have to meet to be used in European countries.
And last but not least THE ECO FRIENDLY TYRE.
Just to give you some information about how safe retreaded tyres are: single airplane tyres are retreaded up to 8 times, and single truck tyres are retreaded up to 4 times
Are remoulds same as Retread?
Although remoulds and retread tyres both contain old casing and new rubber, remoulds were made using old school glue and cold rubber on top of the casing. Retread tyres are made using the same procedure as new tyres, specifically, beads to beads moulded and hot oven. Therefore retread tyres are better quality than remoulds tyres: better speed ratings and load index, more comfortable, better grip and lower road noise.
Current car: 2007 BMW 530d touring.
Previous car: 2005 S4 B7.