Accessory for controlling wear and tear on pneumatic tyre has first section resting on surface of tyre, and second section inserted in tread design

摘要

First section (1) rests on surface of pneumatic tyre (P); and second section (2) is slit in first section, and has lower end (2b) inserted until end (51) of tread design (S) of tyre. Marking system on sliding section works with visual reading system of resting section to determine state of wear and tear.