cn36 tires

[LongRanger]

Another thread . . . .
http://www.early911sregistry.org/for...150#post786150

[Dougal Cawley]

Hey Up

Yes Pirelli do make the P6000 in the sizes 185/70R15 and 215/60R15. These are fabulous tyres, but they are modern square shouldered tyres tyres. so developed to suit more modern cars. so if you have made other modifictions to your car they are fantastic.

http://www.longstonetyres.co.uk/page...-p6000-n2.html
http://www.longstonetyres.co.uk/page...-p6000-n2.html

If you have a car that is unmodified i would suggest if you want that set up the Avon CR6ZZ http://www.longstonetyres.co.uk/page/avon-cr6zz because they are more suited to over powered rear wheel drive cars and have more rounded shoulders so they will act in a more progressive manner.

http://www.longstonetyres.co.uk/page...von-cr6zz.html
http://www.longstonetyres.co.uk/page...von-cr6zz.html

All things considered they will handle in a more progressive manner if you fit them with the same size tyre front and rear. These Cars did earn themselves a reputation for loosing their rear end and i wonder if part of it is down to over tyreing the car.

I think the road cars were fitted with 185/70VR15 front and rear because it was easier to catch when the back end broke away on a smaller tyre? and therefore it is a bit less crashy, where as a wider tyre will hang on longer, but when it is gone it is more violent and considerably more difficult to catch. (which is why i recomend the Avon CR6ZZ for more racy set up, with wide rears)

Any way; which ever way we look at it; Pirelli have just made the original 185/70VR15 CN36 Cinturato again (weather they make 215/60R15 again we will depend i suppose on how well this tyre sells). Part of what has made it viable is that the 185/70VR15 CN36 can be sold to a wider variety cars. I have a picture of them here fitted onto my mates TR6. (Ha Ha! i don't think he had any idea about all that filler under his head light, however he will do when he sees it in the triumph news!)

https://www.borrani.com/en/pirelli-t...cinturato.html
http://www.cinturato.net/
and for State side: http://www.lucasclassictires.com/185...Pir1857015.htm

[LongRanger]

Glad to see that CN36s are available, at least

I've seen photos of the Michelin XZXs in these sizes, fitted to Early 911s . . . and they look great

Problem is . . . Pirellis are listed on my Kardex, so . . .

[RSTarga]

Having driven on all three types mentioned, Pirelli, Michelin and cn36, my favorite was always the cn36. It came out in 73 and was the class of the field especially in wet conditions where the xwx was pretty scary.
Of course the cn36 is also a Pirelli.

[Dougal Cawley]

Thats good news. I don't think the price is silly either

[gekellogg]

Available on ebay as well, but appears to be an old production run:

http://www.ebay.com/itm/Pirelli-Cint...df2fbf&vxp=mtr

[Dougal Cawley]

Hi

yes the ones on ebay are new old stock over 10 years old. you wouldn't drive on them. these are new manufactured by Pirelli in the 51st week of 2014. and they are made very much with Classic Porsche in mind

[VintageExcellen]

So if COAs are showing Pirelli tires around 1970, 1971 then what model tire would it be, must be the CN36? A couple people are saying they remember that the CN36 came out in 73 but I also run into people who have said they bought the very first 911 when it came out in 67. Not knocking anyone who made a statement but it seems there is little info on the dates these tires were available.

[LongRanger]

. . . So if COAs are showing Pirelli tires around 1970, 1971 then what model tire would it be, must be the CN36? A couple people are saying they remember that the CN36 came out in 73 but I also run into people who have said they bought the very first 911 when it came out in 67. Not knocking anyone who made a statement but it seems there is little info on the dates these tires were available . . .

'. . . Looking forward, looking back
The origin and purpose of the steel-belted radial ‘cap ply’
by Jacques Bajer - Also by this author

Prior to the introduction of the Pirelli CN36 nylon bandage/cap ply in 1969, belt/tread detachments or separations were the most common durability failure mode of the steel cord-belted tubeless radial passenger car tires. This failure mode was due to the effects of a combination of tire design adverse factors on which I shall not elaborate, but which, I can assure you, were well-known to tire designers throughout the world and to me.

I first noticed this typical failure mode while working on tire/vehicle systems at Ford Motor Co. in the early 1960s. Back then, vehicle manufacturers did not really develop vehicle dynamics in consideration of possible radial tire belt/tread detachments or separations. But I was curious and, therefore, I focused on them, including using the tire retreading process to make the point. I concluded at the time that tire belt/tread detachments were, indeed, a serious matter, and I immediately called it to the attention of all the radial-ply tire manufacturers.

At the beginning of the U.S. radialization, most tire producers did not readily recognize the significance of the Pirelli CN36 nylon cord bandage/cap-ply tire, but after a few years of operation under real world road/tire/vehicle system operation, they finally did, since radial-ply tires with the Pirelli CN36 design feature experienced much less tread/belt separations, and were working more coherently, as they should.

The cap-ply tires also contributed to improved vehicle handling, as well as to some aspects of the overall vehicle operating smoothness characteristics, this, however, depending upon the degree of thoroughness achieved by vehicle and tire producers in regards to tire/vehicle system tuning. Tuning is the perfect matching of tires to a vehicle and vice-versa.

The Pirelli CN36 in a nutshell

What is the Pirelli CN36 nylon cord banded/cap-ply tire?

In a nutshell, the 1969 Pirelli CN36 steel cord-belted tubeless rayon cord radial body passenger car tire featured a nylon cord cap ply. The purpose of this cap ply was to “girdle” the tire rayon cord radial body and its two steel cord belt plies underneath the tread. This was achieved by winding circumferentially, and under slight tension, heat-treated nylon cords during the green tire assembling process, and this over the entire width of the tire’s two steel cord belt ply package, plus about 10mm over both steel cord belt edges, and connecting to the radial body ply, as shown on Figure 1. This improved tire structural integrity by preventing the steel cord belts from separating from the tire radial body . . .'


http://www.moderntiredealer.com/chan...ck/page/2.aspx

[Harvey Weidman]

How ironic. The initial CN36s on BMWs separated so much most dealers wouldn't refit them.......So much for "new" technology....
BTY just because the tire was made in 69 doesn't mean that it was made in 185/70X15 or that Porsche used it.
Porsche wasn't known for jumping into new unproven tire technology.
Don't know the exact changeover but we were still selling CN 72s as original replacement for earlier cars in 72.....They were both available.....
All I can say for sure is 73 for the CN36. The earlier cars I just didn't pay that close attention to the original tires.
Original spares are the best bet unless you can find an original order form that mentions the tire....
My very unsubstantiated guess is MY72 for the first year OE CN36.
H