Interpretation ID: nht73-4.29

DATE: 06/26/73

FROM: AUTHOR UNAVAILABLE; Richard B. Dyson; NHTSA

TO: The Southern Connecticut Gas Co.

TITLE: FMVSS INTERPRETATION

TEXT: This is in reply to your letter to Mr. David Snyder of this agency regarding information on tests performed on recapped tires, specifically, data comparing failure characteristics of retreaded tires with those of new tires.

The NHTSA does not presently have test data of the specific type you request. We are attempting to obtain that data through research contracts with outside parties, and results of that research, when they are received, will be placed in the rulemaking docket regarding retreaded tires. Other test data for retreaded tires have been placed in this docket (Docket No. 1-8), which is open for public inspection at NHTSA headquarters, 400 7th Street, S.W., Washington, D.C.

Certain studies have been conducted on the failure rates of tires, and some comparative data have been compiled. One volume with which we are familiar summarizes studies which provided information of this type. It is, Brenner and Harvey, Tire Use Survey, The Physical Condition, Use and Performance of Passenger Car Tires in the United States of America, NBS Technical Note 528, (National Bureau of Standards U.S. Department of Commerce). Copies are available from the Superintendent of Documents, U.S. Government Printing Office, Washington, D.C. 20402. It should be ordered by SD Catalog No. C13.46:528, prepaid, at 60 cents a copy.

Yours Truly

May 29, 1973

David Synder DOT/NHT SA

Mr. Litant suggested I write to you for information on tests performed on recapped tires.

(Illegible Words) interested in the safety-failure characteristics of recaps vs. standard tread(Illegible Word) tires. Any information in this area would be appreciated. The size of your sampling is pertinent and this figure would be helpful.

I wish to thank you in advance for your cooperation.

James W. Livsey Supervisor, Claims, Safety & Security