The flexibility in the tire tread between the surface of the tread and the tire carcass. Snow tires, with their small, deep, unsupported tread blocks, have a large amount of tread squirm. Slick racing tires, which have no tread pattern, have very little squirm.
TREAD SQUIRM
Meaning of TREAD SQUIRM in English
English dictionary of automotive terms. Английский словарь автомобильных терминов. 2012