Inner tubes

[leedurrant73]

Hello,

Will be buying tyres soon and probably going for a set of blockley 185/70/15s. The website says check if inner tubes are required.
I have no idea if a 69t had inner tubes fitted. I think my fuch wheels are actually 72?

Can anyone advise?

Thanks Lee

[hot66]

Do you fave flat 6’s then ?

[leedurrant73]

Hello, these are my actual wheels. How do I tell the difference?

Thanks for the help



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[hot66]

Look like flat 6’s to me (72 onwards) and if so They have a safety lip so can run Tubless .

More info

https://forums.pelicanparts.com/porsche ... e-pic.html

[leedurrant73]

Thanks for all the help


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[Dougal Cawley]

I would say make sure you buy the best tyres. there are good tyres and bad tyres.

here is an independent back to back classic tyre test done by a German magazine

this is the rest of the test

https://www.longstonetyres.co.uk/pub/me ... -fFbPjJ9p2

So standard Fusch wheels needed inner tubes up until about 1974. you can tell by the profile of the wheel, and if it has a safety hump on it, becuase i think repro wheels tend to be tubeless now

If you watch the film on here hopefully it explains it as clearly as possible.

https://www.longstonetyres.co.uk/classi ... tubes.html

[camperco]

I've got 5 bobs worth...

Many of our customers are running on the Blockleys and many also running the CN36. All of them very happy for as many different reasons as why they chose what they chose in the first place.

I've driven many of their cars fitted with both tyres and there's not much difference between them. The CN36 is simply the right tyre for the car but its not the only tyre for the car.

The Blockleys do take a couple of heat cycles before they really start to work so if the German magazine testers didn't do that they would have got compromised results.

Once they are bedded in they are great especially the 165x15 on the 356. One customer hits some savage rocks doing a rally in Morocco in his speedster. Bad enough to stop and check for damage. Two bent wheels but no visible damage to his tyres & no pressure loss.

[Dougal Cawley]

I'm sorry about this

why would a road tyre need to be warmed up?

"In braking every centimeter
counts. With an additional braking
distance of 16 meters (almost 4 car
lengths) the Blockleys are definitely
out of the running. Modern
standards are clearly missing here -
our verdict: steer clear! But the
remaining candidates prove that
classic profiles can also be effective -
especially the Pirelli CN36 which is
unequaled on water"

"Of course it's not usual to take a
classic car to full speed on the road
at the weekend; Nevertheless, lap
time is a good reference for the
dynamic qualities and safety
limits of the vehicle. The
Blockleys surprise with sudden
kicking out of the rear axle while
Vredesteins lack crisp turning.
Pirelli and Michelin are much more
harmonious through the bends"

"On the almost
3km long Tazio Nuvolari
circuit south of Milan, the test
driver had ample opportunity
to test this, especially when the
tyres from Blockley were
straining for a connection
between the car and the road;
with a lack of lateral guidance
and a swerving back axle the
driver experienced a rollercoaster ride."

It is interesting to note in this test, the Michelin and Pirelli are proper genuine classic tyres, made by top end tyre manufacturers. the other tyres in this test have had the benefit of modern modelling technology with computer design, which should help move water better, but they just don't the Pirelli does. that modern computer design should dramatically improve rolling resistence and noise and unsuprisijngly the Pirelli looses out a bit there, but it clearly blows the other tyres into the weeds.

On a 356 you would just fit a Cinturato CA67. Why would you fit anything else? its a 1952 tyre, made by pirelli. Its fabulous, and looks good too. It is just a better tyre. the Pirellis are just better tyres all the tests prove that. i get that credit card bill is something to consider, but the modern budget tyres are nowhere near as good.

however here is some good news. i have been working with pirelli to get a 5.00/5.25V16 Stella Bianca cross ply tyres made for 550 Spyder, Pre A 356 and very early Beetles (among other things like pre war BMW). I have had the first pre production tyres made and sold them, but i hope to be receiving a proper batch, hopefully going into production this month, so i might get them in November

[Nine One One]

Fully agree with Angus, there are plenty of tyre choices out there, and not everybody has the budget to run £1200 worth of tyres for all four corners. Modern tyre technology has moved on leaps and bounds, with various compounds, and better stopping distances than old style tyres. Yes the CN36 may have a different carcass, to give old style handling, but on today’s crappy roads, are you ever going to know the difference?

Explanation of Flat 6’s with pictures..........

https://forums.pelicanparts.com/porsche ... e-pic.html

https://forums.pelicanparts.com/porsche ... -pics.html

https://forums.pelicanparts.com/porsche ... -deep.html

[Dougal Cawley]

Fully agree with Angus, there are plenty of tyre choices out there, and not everybody has the budget to run £1200 worth of tyres for all four corners.

I do get that. However the price is reasonable for wht they are. i bought some tyres for the front of my modern BMW the other day and they are over £ 200 each, for modern generic tyres. of course they were a top brand, but they weren't bespoke, small batch, obsolete, performance sports car tyres like these CN36.

However regardless of how reasonable the price is for what they are, we cannot get away from the fact a set of CN36 does make a serious dint in the credit card bill. However, they are just better. In the same way an air cooled Porsche is better than a Beetle!

Modern tyre technology has moved on leaps and bounds, with various compounds, and better stopping distances than old style tyres. Yes the CN36 may have a different carcass, to give old style handling, but on today’s crappy roads, are you ever going to know the difference.

That is just wrong. the Pirelli Cinturato has exceptional compounds and i dont know if anyone is reading this tyre test they would see the exceptional compounds. Look at this wet test.

It took 16 metres, (4 car lengths) longer for the modern budget tyre to stop compared to the Pirelli.

The advantage that modern computer design does give is rolling resistence. When you look at these overall tests, the only test in which the Pirellis performance is not extraordinary is the rolling resistence. But the Pirelli excells over the modern tyres in this test.

When you look at the dry handling test Pirelli knocks everything else into the weeds. even the modern tyres in this test.

The the dry braking. a perfect score.

Modern tyres do not have better compounds
Modern tyres do not have better stopping distances than the CN36.
Pirelli CN36 do give better handling, specially on our modern crappy roads.
yes you are going to notice the difference.

Yes i am labouring this point. However the point is that yes the CN36 is a lot better than modern tyres on a classic car, specially an old Porsche. Its here in black and white (and colour as well actually)

https://www.longstone.com/images/tire-t ... e-test.pdf

Of course buy what ever tyres you want; but don't buy modern tyres under the impression that they are going to be better on an aircolled Porsche road car than the Pirelli Cinturato CN36, because they aren't. This test demonstrates a balanced independent view. You can I hope, make your decision from an informed position and choose weather to make these compromises to save money. But know you are doing it to save money.

[70sThrowback]

It took 16 metres, (4 car lengths) longer for the modern budget tyre to stop compared to the Pirelli.

Hi Dougal, always appreciate your knowledge on this, but I am confused. This test appears to be 4 modern versions of classic tyre profiles in this comparison. Where are you getting the 16 metre longer from to compare against a modern budget? The 16 metres is over the Blockley isn't it? I think the more important question for this group would be how does the wet braking compare to something like a Continetnal Premium Contact 6? Which is a tyre many of us run on our older cars.

[Nine One One]

Always find these reviews from Auto Express very informative for making a choice.

https://www.autoexpress.co.uk/product-g ... es-buy-now

Especially when there are few in there you may not consider?

https://www.tyrereviews.com/Article/202 ... e-Test.htm

[Dougal Cawley]

The Michelin and Pirelli are both proper period tyres with the right carcasses, but modern compounds. However unlike the other tyres in the test they look period and don't have the benefit of having been able to use computer modeling in the design of the tyre.

i don't think Continental make a 185/70VR15 do they?

for a tyre to get a perfect score in dry braking, and a 1- in wet is simply down to it having excellent compounds and a quality carcass.

In all the scores the CN36 scored above average most of them well above average. The period Michelin was second best in the dry, though it did struggle in the wet against the Vredestein. Then Blockley, a completely modern tyre. nothing about that tyre is classic other than the fact it is made in otherwise obsolete sizes.

Making tyres is a balance of features. You can play one feature against another. You would expect a tyre that brakes well in the wet, to maybe not have such good high speed directional stability and longevity for instance. For the CN36 to return such good results in the dry and also perform exceptionally in the wet is an extremely good tyre. And it thrashes to 2 modern tyres in the test.

[Nine One One]

But how are they doing for wear?? Any feedback on how are they actually lasting. You can make any tyre perform brilliantly with the right tread and compound (take rallying or circuit tyres for example) bit shite if you only get 5000 road miles or less out of them, before they need replacing though?

[70sThrowback]

Always find these reviews from Auto Express very informative for making a choice.

https://www.autoexpress.co.uk/product-g ... es-buy-now

Especially when there are few in there you may not consider?

https://www.tyrereviews.com/Article/202 ... e-Test.htm

I tend to go from recommendations from specialist forums (like here), but its good to see that the Conti's I have on my 912 and the Goodyears I have on my Boxster are up there in performance.