4x4 Glossary
From A-Z: All you need to know about 4x4 cars, tyres and beyond.
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The RTM (Replacement Tyre Monitor) provides the user with a warning when the tyre is worn and has to be replaced. The inscription “Replacement Tyre Monitor” shows three times on the circumferential rib of the new tyre. Just before the tread reaches the minimum tread depth indicated by the TWI (Tread Wear Indicator bars), the inscription will change to “Replace Tyre”.