I find that easiest and fastest way to determine if a tire can continue to be used is to look at depth of the pattern.
As a result, many speculators recut retreaded old tires and continue to sell them as used tyres.
Also a little knowledge for everyone. Used old tires are actually not unusable at all, and can continue to be used after special treatment.
Of course, technology and processing techniques are definitely not as simple as engraving patterns, but very specific! Retreaded tires must be clearly marked and rarely appear on family car market.
In fact, there are many fillers under crown of tire that support tire. For a tire that has been scrapped, rubber pattern at top is almost worn out, and cutting pattern downwards may cause damage to filler, and tire will become very brittle, and danger is obvious.
However, height of road is one foot, and height of dash is one foot. Now, retread craftsmanship can indeed be confused with real thing, so way to stop everyone from buying retreaded tires is to buy them through regular channels, and don't be greedy on cheap! I have summarized 3 ways to define "plain retreaded tires" for reference.
The first step is to look at production date
You can find these four numbers on side of tire. Among them, last two digits represent year, and first two digits represent week of year. For example, 0610 in figure below represents sixth week of 2010.
Second step: look at wear indicator
Under tire design, there will be an indicator showing degree of wear. If this tire is repaired by speculators according to method indicated at beginning, then this indicator will definitely not be. The pattern is very deep, but it is not visible. According to indicator, it should be restored rubber.
Third step - look at color
Many manufacturers of retreaded tires wax their tires to make them look shiny. On these tires you can see fingerprints when you touch them with your hands, but this does not happen on regular new tires. In addition, pattern will not be uneven and workmanship is very poor, at this time you need to keep your eyes open to distinguish it.