Tireless In Tulsa- Need Advice From Early Porsche Folks
02-14-2002 | 11:31 AM
#1
Thread Starter
Intermediate
Joined: Dec 2001
Posts: 26
Likes: 0
From: Owasso, OK (Tulsa area)
Tireless In Tulsa- Need Advice From Early Porsche Folks
I brought a 72T out of a 15 year garage nap. The Michelins on it have great tread but I don't trust the rubber. The Manual says I need 185/70VR/15 tires. Guess what- nobody in Tulsa can get them (except one company with a price tag of almost $1K for 4 V rated tires-Ouch) Local tire dealers suggest running 195/65V/15 's on the car. Local Porsche dealer service guys say sorry, no clue. (typical)
Any input from you experienced owners of early cars would be appreciated. Do you guys have any suggestions for sizes and brands?
Thanks
Ron Horton
72T
RL#020223-3475
Any input from you experienced owners of early cars would be appreciated. Do you guys have any suggestions for sizes and brands?
Thanks
Ron Horton
72T
RL#020223-3475
02-14-2002 | 11:54 AM
#2
Instructor
Joined: Jun 2001
Posts: 220
Likes: 0
From: New Jersey
You should have no problem running 195s on you 72.
When I had my 71T I was running 205s and the only problems I had was some rubbing on the front inner wheel well when making REALLY sharp turns and it throws the speedo off a few miles but you could always have it recalibrated if it bothers you.As far as running the 185s try Tire Track they are a very good source for tires at good prices.They have a good web page checked it out.
When I had my 71T I was running 205s and the only problems I had was some rubbing on the front inner wheel well when making REALLY sharp turns and it throws the speedo off a few miles but you could always have it recalibrated if it bothers you.As far as running the 185s try Tire Track they are a very good source for tires at good prices.They have a good web page checked it out.
02-14-2002 | 01:08 PM
#3
Intermediate
Joined: Aug 2001
Posts: 27
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From: NYC
I got a set of Yokohama AVS Intermediates in 205/60/15 from Tire Rack. They handle great, look good and fit my stock '73 coupe. Even with the bigger tires, the motor still turns at pretty high RPMs at highway speeds. See if they still have that size available..
02-15-2002 | 10:48 PM
#4
Instructor
Joined: Aug 2001
Posts: 164
Likes: 0
From: Agoura, CA
I was lucky and grabbed one of the last sets of Yokohama A008 185/70R15's from Tire Rack a while ago. Apparently only the vintage guys like Coker Tire can still get 185's anymore.
I would suggest the 205/60's. They will handle somewhat better, fill out your wheel wells a bit for a more aggressive look, and are very close to stock diameter/circumference for minimal impact on gearing and speedo calibration.
Another option is to switch to 16" wheels and run 205/55R16's. When I drove my 70E a lot more often, I used 16x6's for street & track wheels and saved the original restored 15x6's in storage.
I would suggest the 205/60's. They will handle somewhat better, fill out your wheel wells a bit for a more aggressive look, and are very close to stock diameter/circumference for minimal impact on gearing and speedo calibration.
Another option is to switch to 16" wheels and run 205/55R16's. When I drove my 70E a lot more often, I used 16x6's for street & track wheels and saved the original restored 15x6's in storage.
02-17-2002 | 02:10 AM
#5
Addict
Rennlist Member
Rennlist Member
Joined: Jun 2001
Posts: 577
Likes: 3
From: Stuttgart FRG
Hello
195/65/15 are a Porsche approved direct fit.
This size was standard on all post 85 911/924.
However they are not allowed with 4,5" rims and on SWB cars the steering might need a stop to avoid wheelweelcontact.
The 185/70/15 are still aviable for people who like the original look.
AFIK the Michelin MXW and a Yokohama all weather are aviable. In germany we can have some Fulda Y2000 and some Avon Race tires
In HR version are more brands aviable. A T will not need the VR type ( 210 km/h ).
Static Rolldiameter according to DIN are 1935 (195/65) to 1975 (185/70).
Thats some 2% and under the 3% rule to recalibrate the speedo for accuracy. However depending on rimwith and tire brand the static rolldiameter differs, also the dynamic rolldiameter changes in different behaviours.
Most tire manufactors try to have the best accuracy at the city speeds.
205/60/15 have a 1910 mm rolldiameter and in germany you must use the suiting speedometer.
The 205/65/15 with 1975 mm Rolldiameter suits perfect but is rare ( Audi, Mercedes, BMW ) and can have clearance problems. Also they are mostly designed for heavy limousines and not sportcars.
Said that most tires are heavier then the original ones adding unsprung wight.
Grüsse
195/65/15 are a Porsche approved direct fit.
This size was standard on all post 85 911/924.
However they are not allowed with 4,5" rims and on SWB cars the steering might need a stop to avoid wheelweelcontact.
The 185/70/15 are still aviable for people who like the original look.
AFIK the Michelin MXW and a Yokohama all weather are aviable. In germany we can have some Fulda Y2000 and some Avon Race tires
In HR version are more brands aviable. A T will not need the VR type ( 210 km/h ).
Static Rolldiameter according to DIN are 1935 (195/65) to 1975 (185/70).
Thats some 2% and under the 3% rule to recalibrate the speedo for accuracy. However depending on rimwith and tire brand the static rolldiameter differs, also the dynamic rolldiameter changes in different behaviours.
Most tire manufactors try to have the best accuracy at the city speeds.
205/60/15 have a 1910 mm rolldiameter and in germany you must use the suiting speedometer.
The 205/65/15 with 1975 mm Rolldiameter suits perfect but is rare ( Audi, Mercedes, BMW ) and can have clearance problems. Also they are mostly designed for heavy limousines and not sportcars.
Said that most tires are heavier then the original ones adding unsprung wight.
Grüsse
