 Curiosity Kill The Cat, Why Tubes? |
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| JawjaPorsche |
 Nov 29 2018, 04:37 PM
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#1
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Advanced Member  Group: Members Posts: 3,463 Joined: 23-July 11 From: Clayton, Georgia Member No.: 13,351 Region Association: South East States  |
Someone posted this 1971 spec page.
I noticed the four had tubeless tires but the six had tubed tires. Can someone please share why they were different.. Attached image(s) 
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Replies(1 - 5)
| wndsrfr |
Nov 29 2018, 04:43 PM
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#2
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Senior Member Group: Members Posts: 1,454 Joined: 30-April 09 From: Rescue, Virginia Member No.: 10,318 Region Association: MidAtlantic Region 
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I'm going to guess it's the speed rating available with the skinny tire/wheel combo?
Weights seem low. |
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| Tom_T |
Nov 29 2018, 04:43 PM
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#3
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TMI.... Group: Members Posts: 8,321 Joined: 19-March 09 From: Orange, CA Member No.: 10,181 Region Association: Southern California
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IIRC the 5-lug steel wheel was a carry over from the 911/912 in the non-tubeless type steel wheels - so a tube was required; but I also think that the -6's optional Mahle & Fuchs 5-lug alloys were tube type wheel.
So they actually came in both tube & tubeless flavors. (IMG:style_emoticons/default/beerchug.gif) Tom /////// |
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| fixer34 |
Nov 29 2018, 07:52 PM
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#4
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Senior Member Group: Members Posts: 1,303 Joined: 16-September 14 From: Chicago area Member No.: 17,908 Region Association: Upper MidWest
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If I recall, when I got my -6 with steelies and 185/70-15 tires many years ago, they all had tubes. Kept them that way until I had to have a tire removed/reinstalled for some reason and the kid at the tire shop had no idea what to do with a tube tire (apparently). Got about 5 miles away and a rear tire blew out at about 50. Shredded the sidewall so had to get new tires (the shop of course said it wasn't their fault..).
Put in new stems and been running as tubeless the last 30+ years without a problem. |
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| johnhora |
Nov 30 2018, 08:31 AM
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#5
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Senior Member Group: Members Posts: 888 Joined: 7-January 03 From: Derby City KY Member No.: 107 Region Association: None
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Early 911 wheels like the deep 6" Fuchs didn't have the tubeless "hump" formed on the inside of the rim. Supposedly this keeps the tire bead from slipping to the inside of the rim and sudden loss of pressure. This could happen with low pressures and severe cornering. So they used tubes like most early cars.
go hear for all you want on the patent https://patents.google.com/patent/US4606390A/en  |
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| Mark Henry |
Nov 30 2018, 09:59 AM
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#6
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
QUOTE(johnhora @ Nov 30 2018, 09:31 AM)  Early 911 wheels like the deep 6" Fuchs didn't have the tubeless "hump" formed on the inside of the rim. Supposedly this keeps the tire bead from slipping to the inside of the rim and sudden loss of pressure. This could happen with low pressures and severe cornering. So they used tubes like most early cars. (IMG:style_emoticons/default/agree.gif) All rims without an inner bead should have tubes. Yes you can get away without tubes but you're definitely taking a gamble. |
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