Show AUTO SHIMMY LAID TO TIRES Engineers Tackle Vexing l Problem Concerning l Front Wheels i Ada l C By Oy X NA A SOUTH BEND Ind Jan 25 20 2 Balloon tires and wheel four tour brakes brake which brought Increased comfort and to motorists presented new problems problem to auto auto- automotive motive engineers n The These two Innovations cause CAUSO what t Is la known to as 08 shimmy tramp or gal lop eal al- al lop bouncing of the front wheels ot of the car Each car seems to present an Individual problem In shimmy shimmy tag Ing says K Ii J lowell labora labora- laboratory laboratory tory engineer of ot the th Studebaker corporation Howell says that thero ther are arthree three distinct phases phase which my mayb be used as an Index to shimmy Inc shimmy shimmy- shimmyIng Ing cars CI II lie He list lists them as aa fol follows fol- fol follows lows 1 Occurrences i-Occurrences Occurrences at low speeds somewhat below 21 26 mlle miles an hour which register while driving OV over rough roads as i wheel steering 2 Wheel 2 at speeds up to 40 or 01 45 41 miles an hour lour prin prin- prin principally principally while driving over rough roads and registering as obvious wheel front wheel and steering steering- st wheel wheel el kickback 3 3 speed shimmy at speeds usually lIy above a o bo 40 miles an hour and by the entire car with different dere do- do grees ot of violence Different types type ot of tires seen seem to have hav vastly different characteristics Howell points point out The Th round caress toun found found- tread round l- l tread lire Ure Ir generally has ha the tho th worst shimmy char characteristics Usually the tho th moro more mor rigid the tire Uro Is the tho th less the tho th shimmy How However ever er the tho th more mor rigid the th tiro tir Is th the Ie less leu th the tir tire Uro serve serves ewes th the tho funda funda- fundamental fundamental mental purpose p of a II a cushion While Howell lay lays some lome ot of lh the blame blamo for shimmying on th the wheel four brake ho he h says that carl care equipped with these the brake and ind pressure high tires tiro seldom show a tendency to wheel front front wheel vibration proving that the tir real cure for shimmying must come CODIO from tire Ure tir construction |