![]() The shaft with the measurement markings will slide upward as you push the “foot” down and show you the depth of the tread. Then push down the “foot” of the gauge until it firmly rests on two elevated ribs of the tread on either side of the groove. To use the gauge, fully extend the rod and insert it into one of the grooves. The graduated probe has a thin, retractable rod, a perpendicular “foot” and a cylinder with measurements marked on it. The most common model of this tool is a graduated probe, which can be found at car parts stores. If your tyre has worn down until flush with any of the tread wear indicator bars, it’s time to replace it, even if the tread is still higher than the indicator bars elsewhere on the tyre.Īnother way to check your tread depth is to use a tyre tread depth gauge. The height of the bars is set at 1.6mm above the lowest point of the groove, which is the legal depth at which a tyre must be replaced in the UK. “Tread wear indicator” bars normally have an indicator on the sidewall of the tyre, for example the abbreviation “TWI” or a similar indicating symbol would be stamped in the sidewall in-line with the bars for easy reference. These bars are chunks of rubber that span the longitudinal grooves in the tread usually at every 60 degrees around the circumference of the tyre. Maybe the easiest way to check tread depth is to examine the tread wear indicator bars. You should use the smallest measurement as the basis for your decisions about replacing tyres. ![]() Whichever method you use, you need to check the tread depth at various points around the tyre’s circumference. The most common of several methods for taking this measurement are: checking tread wear indicator bars, using the “penny” test or measuring with a tyre tread depth gauge.
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