Guys,
The term *cupping* is widely used - and misused. Technically, the cause is out of balance or a bad shock - BUT - it has been used so often to refer to other forms of irregular wear, that the term is used interchangeably for diagnonal wear, one sided wear, feathering, etc. Besides, it's kind of hard to distinguish between the various types of irregular wear.
Since most people are amatuers when it comes to identifying irregular tire wear - including many who work at tire shops - I think we need to cut these people some slack about what words they use.
