"DO AND DON'T"

NZ Truth, Issue 1215, 14 March 1929, Page 18

"DO AND DON'T"

Wear Caused By Slipping Action

"Don't,'" reads the old rule, "reverse the direction of rotation of tyres if you want to get the most mileage from them." DUT times change, and rules change *•* with them. To-day the bureau of standards suggests that it may be desirable to change the direction of rotation of tyres occasionally m order to reduce the wear through "scuffing." The old theory was that when a tyre's tread had become accustomed to taking strain m the one direction it was best to let it go along m the same old rut throughout its entire life. When the garageman changed a tyre many car owners were careful to see that the t3 r re- went back on the wheel m such a way as to roll m its accustomed direction. But the latest tests ahow that much tyre, wear is due to a constant slipping action, known as "scuffing" and suggests that much of the peculiar wear on the treads could be spared by occasionally reversing the direction of rotation of the tyres.