Interesting to note the tyre in this video....
https://www.youtube.com/watch?v=KVU3...ata_playerhttp
Interesting to note the tyre in this video....
https://www.youtube.com/watch?v=KVU3...ata_playerhttp
Yup, and note that was filmed in 1973...Quote:
Originally Posted by Darren65
Thanks for input chaps.
Agree. If it is excerpt from the full “one for the road” P+A corporate video pretty sure that video shows the 73 Daytona RSR winner of feb 73 race already back in Germany and iirc saw a single bolt fan strap so probably spring 73 or later ? I previously posted in forum a snippet from a 73 publication announcing the new film was being shown in U.K. showing date October 1973 having premiered at that year’s the 18th Parade:
Attachment 525007
Steve
Data point - 11/71 Fuchs with 51st week of 71 tire...
NOS Fuch 6x15 with NOS tire
Thanks for the update Arne.
If I’m reading photo correctly another veith pirelli cn72 (not cn36) that might be factory original fitted to a 911 or at least a very early replacement
So far the ( limited) evidence surfacing is pointing more towards CN72 being the type Pirelli used into longhood era on My 72 or later even though cn36 type paralleled the CN72 maybe the former not available in the specific 1857015 VR format and speed rating required for 911?
Clearly cn36 185 70 vr 15 was available for front 6 inch fuchs of every RS by the winter of calendar 72 .. but before that ?
Steve
Steve, using my experience with date codes from my first 20+ year career in tires (in the late '70s through '98), I'd hazard a wager that the tire in quest is original fitment, not an early replacement. The match up of the dates is too close - November 1971 for the Fuchs wheel, and late December 1971 (51st week of 1971) for the Pirelli tire. The wheel has never been bolted on a hub (note the unmarked lug seats), and the wheel weights are typical German weights that were difficult - if not impossible - to come by in the US in those days.Quote:
Originally Posted by 911MRP
So I'd say this is a pretty safe indication that CN36 had not supplanted the CN72 as original fitment through very early '72 built cars. Can't extrapolate farther than that, of course.
I have the original spare for my 72 T and it has a CN36 on it. The build date is 6/72.
Attachment 525253Attachment 525255Attachment 525257
Interesting input Don. Now that seems to be a datapoint giving insight into cn72 /cn36 supercession date. Yours is 13 March 72 tyre if I’m correctly decoding 112 DOT code as week 11 of 1972. Suggests a supply lead circa 2 months to get cover on wheel and a month more for wheel/tyre put as spare of a June 72 produced car.
That is earliest CN36 I’ve seen on 911 so far. I can see from photo it is one of the tube type so does strongly point to that DOT third digit 2 being from 70 decade ( 1972) not decade 80s (1982). Latter I inderstand would be tubeless.
Does your sidewall mention the matierial used in construction of your example — I assume it is fabric not the later steel radial type used by Porsche from December 74?
Incidentally regarding other part of question: timing vis a vis use on RS, your 572? May 72 wheel date stamp on the Fuchs of your model year 72 car and my own model year 73 RS are actually very close indeed! Not sure how well known it is that the earliest genuine RS with the famous coloured 6/7 inch Fuchs have date stamps that are a quite number of months before the car’s date of production — I don’t know when the cn36 tyres got fitted to those rims. Obviously RS had additional loop to swap wheels and tyres post weigh scales visit.
Cheers
Steve
I agree with the tire timeline. Yes it is a 2ply rayon tire and you are correct it is a tube tire.
Found the matching Veith Pirelli booklet with vehicle fitment information being small pocket size it had slipped between two bigger books on my shelf.
It doesn’t shed light on the question at hand as looks backwards to earlier model years:
Attachment 525311
Nevertheless I’m sharing a few snippets from my reference booklet for folks in the ESR community who might be interested in such historical contents from the German Subsidiary of the Pirelli company who were evidently a supplier to the Porsche factory back in the day:
Attachment 525308
Attachment 525309
Attachment 525310
This is for historical interest only it may not represent latest standards and regulations so consult with suitably qualified specialist in your country and region regarding safety critical matters.
There are folks with more experience of selling tyres than I do.
Steve