Since the tubeless tires and especially cast alloy wheels are used, the air tightness\nof wheels is an important factor of the automobiles quality. Based on\nspecification of the car industry that up to 10% decrease of the prescribed\nnominal tire pressure during a time of six-month is allowed, the requirements\npresented in specifications and norms are treated and validated. The practical\nexperience and influences on the wheel tightness control are discussed and the\ndata presented in a report of a wheel manufacturer, concerning the replacements\nof wheels in service due to air leakage are evaluated. Summarizing the\nresults of analyses, a proposal is made for the testing of the cast aluminum car\nwheels to meet the requirements for a reliable and economical air tightness\ncontrol in modern test facilities.
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