Pneumatic tire tread

摘要

A pneumatic tire tread has tread elements (10) formed by circumferential and/or lateral grooves. At least one tread element (10) has a sipe that devolves from a constant width sipe having a three dimensional aspect in at least a portion of the radially outer portion of the sipe to a wider width groove at the base of the tread feature. Also a blade (26, 44) to create such a sipe is disclosed.