National Geographic : 1973 Aug
Radial Tire steel-belted radial can. protect you 5 ways. Guard 4: Against Loss of Road Contact on Curves. Two special outer grooves help the tread and the sidewall to work independently for firm tread contact on curves. Guard 5: Against Sluggish Handling. Two special stabilizers stiffen the lower sidewall and help allow recovery on sudden swerves.