IanM wrote: ↑Thu Jan 19, 2023 5:17 pm
Dougal Cawley wrote: ↑Thu Jan 19, 2023 4:19 pm
no not in CN36.
That is the wrong size for Porsche anyway. What car is it for?
1970 Porsche 911.
Can 215/60 R15 be fitted with an inner tube?
Hmm
1970 911 fittted 185/70VR15 CN36 front and rear.
https://www.longstonetyres.co.uk/classi ... e/911.html
I would continue with that.
I think your car will handle better with 185/70VR15 front and rear. fitting 215/60 rear will not handle as nicely. (but it will diminish wheel spin) I think cars that had 215/60 rear had their geometry changed to try to maintain progressive handling. yet they still didnt handle as progressively as the cars with 185/70 rear. however the RS and Carera of that period were more of a handful alround.
I think this was the period where these cars got a bit of a reputation for their handling where apparently the Porsche 911 let go on the back end very suddenly and just changed ends, but i think that was driven by people over tyreing the rear and, worse still, putting unsuitable squarer shouldered tyres on their car.
I was talking to Pirelli yesterday trying to push the 215/60VR15 CN36 towards the front of the list of tyres we are trying to get made, currently i have July which isnt ideal. If i make any progress i will be straight on here to let you know. but your car will be nicer on standard tyres as a road car.
Inner tubes
this page i hope explains it nicely
https://www.longstonetyres.co.uk/classi ... tubes.html
basically you should not fit an inner tube in a 60% profile tyre. the current production of 215/60R15 CN36 are tubeless tyres.
Oh wouldnt it be nice if everything were that simple:
yes the first RS and Carrera originally fitted 215/60R15 Cinturato CN36 tyres that were tube type tyres on a trube type wheel rims. not ideal
yes these early rims were tube type rims that do not have the safety rib that makes them safe as a tubeless wheel, so you should really use a tube on that wheel.
yes the original CN36 were tube type tyres, but the current tyres must be run tubeless. because current ethos says dont fit tubes in low profilt tyres.
point in fact:
i only know of these early Porsche fitting a 60 profile tyre with inner tubes. and i also know they didnt do it for long. that soon stopped.
yes there were wheels described as tubeless without the safety rib, but again that soon stopped and i dont think they did it on fast cars.
i think the tube type 215/60r15 tyres and wheels were a mistake that Porsche and Pirelli pretty much immediately nipped in the bud.