When did tire sizes change from outside diameter?

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When did tire sizes change from outside diameter? #388589 05/01/17 03:30 PM
Joined: Apr 2006 Posts: 3,511 Likes: 48 San Leandro, CA Rustoholic OP ChatMaster - 3,000
OP Rustoholic ChatMaster - 3,000 Joined: Apr 2006 Posts: 3,511 Likes: 48 San Leandro, CA	When did tire manufacturers stop using the outside diameter and tire height as the tire size (for example, 30x5)? I know that there are newly made reproductions with these size designations, but when did the original sizes change? That info can help me identify the age of my ancient tires on Lurch. Thanks, Dean Last edited by Rustoholic; 05/01/17 03:31 PM. Dean 'Rustoholic' Meltz old and ugly is beautiful! Lurch (1927 LM 1 ton truck) Lurch's Gallery Forum Justin (1928 AB Canopy Express) Justin's Stovebolt Gallery

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Re: When did tire sizes change from outside diameter? Rustoholic #388591 05/01/17 04:34 PM
Joined: Jan 2002 Posts: 30,701 Likes: 141 West Allis,Wi. Chev Nut ChatMaster - 25,000
Chev Nut ChatMaster - 25,000 Joined: Jan 2002 Posts: 30,701 Likes: 141 West Allis,Wi.	From what I find 1929 was the last year for the old measurements. Last edited by Chev Nut; 05/01/17 04:36 PM. Gene Schneider

Re: When did tire sizes change from outside diameter? Rustoholic #388603 05/01/17 09:13 PM
Joined: Nov 2001 Posts: 29,863 Eagle Point, Oregon Junkyard Dog Tech Advisor ChatMaster - 25,000
Junkyard Dog Tech Advisor ChatMaster - 25,000 Joined: Nov 2001 Posts: 29,863 Eagle Point, Oregon	Quote When did tire manufacturers stop using the outside diameter and tire height as the tire size (for example, 30x5)? Tire sizes like your 30x5 example above were still used on the trucks thru at least 1933. The Mangy Old Mutt "If It's Not Junk.....It's Not Treasure!"

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