An improved automobile tire that incorporates studs for engaging a roadway surface during times when covered by snow and especially by ice; the studs protruding from a narrow area around the tire which during normal use in non-icy weather is concave so to form an annular recess in order that the studs do not engage the roadway; the tire having a separate air cell just behind the annular recess which is inflatable during icy weather by a separate valve so to push outwardly the recess thus exposing the studs beyond the remainder of the tire outer periphery.