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Thread: Early 911 tyres film

  1. #11
    Quote Originally Posted by doigthom View Post
    Why no recommendation for Pirelli CA67? Because they require a tube?
    There is. that is the first tyre we recommend. We list it on our 911 page as well http://www.longstonetyres.co.uk/page/porsche-911

    One of the best options and certainly the most correct for early cars. the CA67 is currently the only pre 1965 tyre made in 165R15. then the XAS came out in 1965. then the Cinturato CN36 in 68.

    Because of a request on another site i have made a short film about tubeless tyres and wheels https://www.youtube.com/watch?v=kWJ-tWP3iU0&t=58s it might be interesting.

    However to summarize
    if it says tube type on the tyre fit a tube.
    If you have tube type wheels fit a tube.
    if it is a 70% (eg 185/70VR15) or full profile (eg 165R15 or 165/80R15 (same tyre)) you can fit a tube, even if it is a tubeless tyre. (you can also fit tubes on tubeless wheels)
    If in doubt fit a tube except if the tyre is 65% profile or lower (eg 195/65R15) do not fit a tube, do not fit 65% or lower tyres to a tubeless wheel.

  2. #12
    Registry member# 206 fourteenten's Avatar
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    Just a couple more Cees and Kees's here
    Question Doug, my RS came from the factory with Dunlop tires, 185/70 front and 215/60 rear, what type Dunlop was that? SP57? Is there a tyre that is similar nowadys?

    Kind regards,

    Cees

  3. #13
    Vintageracer John Straub's Avatar
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    Good stuff...

    John
    1965 911 #301111, Red Book Vol 1 "Cover Car," owned 53 years.
    1967 911 #307347, bare-bones, some road wear, a little surface rust, and a few dents..., owned 13 years.
    1970 914/6GT, (Sold - ran the last three Rennsports)owned 30 years.


    Photography Site: JohnStraubImageWorks.com

    Registry #983
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  4. #14
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    Doug Cawley says: "If you have tube type wheels fit a tube."

    I strongly disagree! There are 100s of thousands of "tube type" wheels running tubeless tires with no issues.
    Do you also think we should all have ringer washing machines and black and white TVs, too?

    Regards

    Jim
    Last edited by Jim Breazeale; 08-02-2017 at 10:12 AM.

  5. #15
    Quote Originally Posted by Jim Breazeale View Post
    Doug Cawley says: "If you have tube type wheels fit a tube."

    I strongly disagree! There are 100s of thousands of "tube type" wheels running tubeless tires with no issues.
    Do you also think we should all have ringer washing machines and black and white TVs, too?

    Regards

    Jim
    Ha Ha!

    I just think if a wheel was developed to be run with an inner tube, fit an inner tube. Don't take the risk.

    I would be very interested to know where this fact came from:
    Quote Originally Posted by Jim Breazeale View Post
    There are 100s of thousands of "tube type" wheels running tubeless tires with no issues.
    You've just made that up.

  6. #16
    Quote Originally Posted by fourteenten View Post
    Just a couple more Cees and Kees's here
    Question Doug, my RS came from the factory with Dunlop tires, 185/70 front and 215/60 rear, what type Dunlop was that? SP57? Is there a tyre that is similar nowadys?

    Kind regards,

    Cees
    Dunlop sadly don't make any historic road tyres any more. since the Dunlop Fort factory in Birmingham closed. which is a shame because their crossply tyre for pre war sports cars were fantastic

    Well for full monty tarmac rally there is http://www.longstonetyres.co.uk/page...-classic-tyres these are great. but a bit full on for road use. I nailed a set in an hour or so's track use on Wednesday. But they are just epic. If you are going rallying or sprinting they are fantastic.

    there are only 2 really good road tyre options:-

    Avon make the CR6ZZ which is a great road legal race tyre http://www.longstonetyres.co.uk/page...von-cr6zz.html & http://www.longstonetyres.co.uk/page...von-cr6zz.html these have a very robust carcass designed for track use. they don't look right because they aren't a period tyre, and the tread design is nothing like they did in the day, but importantly the cacass is designed to suit a classic car, so they have more rounded shoulders than a modern tyre and handle much better on a car like yours .

    The one i would fit would be the Pirelli Cinturato CN36 N4 http://www.longstonetyres.co.uk/page...o-cn36-n4.html & http://www.longstonetyres.co.uk/page...o-cn36-n4.html these are the best road tyres for a car like yours. handling wise and ride quality they are superb. and they look right with the correct OE CN36 tread pattern. Oh yes and Porsche say they are right as well hence the N4 designation.

    Pirelli also make a P6000 which although it is a great tyre, it will look completely wrong on your car, but more importantly to me they won't handle as well on your car, because the carcass is designed to suit a later car.

    The Avon CR6ZZ is a track tyre, but it is much heavvier than the CN36 N4 so i wonder what would return the best lap times because unsprung weight is critical and the difference is big.

    If it is road use then it's easy CN36

  7. #17
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    Quote Originally Posted by Dougal Cawley View Post
    Ha Ha!

    I just think if a wheel was developed to be run with an inner tube, fit an inner tube. Don't take the risk.

    I would be very interested to know where this fact came from:

    You've just made that up.
    Dougal

    Yes, I made it up. I'm pretty confident that my "made up" number is extremely conservative, though.
    I understand why you are following "the company line", you are in the tire business and you don't want to say something that could be used in a court of law.
    In the real world, though, countless numbers of cars are running tubeless tires on rims not specifically designed for them. I stand by me statement.
    I guess we need to establish what a "tubeless" rim is.
    I am under the assumption that a rim designed for tubeless tire has a "safety bead" built into the rim. Porsche didn't put a "safety bead" on their steel wheels until the 1968 YM cars.
    I'm sure you have seen plenty of 67 and earlier Porsches with tubeless tires on their original wheels and no one that I have ever heard of has ever had an issue.

    Regards

    Jim
    PS: I actually enjoyed your video and look forward to more.

  8. #18
    Hi Jim

    Thank you for your comment on the film. you might like this one too.


    I'm not just following the company line though i just think it is safer to use a tube if you don't have the safety bead. And it is no real hardship to have a tube. http://www.longstonetyres.co.uk/page...be-15e-13.html they are only £ 12 (+VAT) each for a Michelin tube. I can see no reason to fit a tube in any pre 68 wheel. I'm sure there are lots of pre 68 wheels that are fitting "tubeless" type tyres, but they do have a tube in. why wouldn't you. (obviously if you had a 195/65 tyre or lower. You should not fit a tube, but it would be wrong to fit them on a pre 68 car.)

    As an aside we would fit them for free if you were near here http://www.longstonetyres.co.uk/page...c-tyres-poster

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