Wear indicator for tyres

摘要

The tire tread has a wear indicator formed by cavities (101, 102) emerging on a running tread (30). The cavity (101) has a circular trace and the cavity (102) has a ring shaped trace provided with a bump (103). The geometric shape of the traces does not change based on wear of the tire tread, and is an analog expression of the attrition rate. The bump is transformed into another bump (104) when the tire tread arrives at its wear threshold. Independent claims are also included for the following: (1) a tire including a tire tread (2) a casting unit for casting a cavity in a running tread of a tire.