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jmz jmz is offline
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what are you guys that race vintage using for tires?

I'm curious what tires those of you that run 15x8 or 15x9 wheels are using for tires and what you might use next year in SVRA with the new rules coming into effect.


SVRA RULES:

Group 8 - Molded Treaded Tires
Minimum aspect ratio of 45, except
certain car Make and Models, which
have specific tire requirements listed
in their Supplemental Regulations,
tread depth—no less than 2/32”
remaining, at all times, over 75% of
the tire.
Wheels may be of an alternate
material but must be of period
design. They must be the correct
diameter and width as specified
within the Supplemental Regulations
of the Make and Model.
Tires may not extend beyond the
fender opening at the highest point
of the tire.
Approved tires:

There are no specific sizes listed because of the large diversity of Group 8 cars.
All Group 8 cars must use similar sized tires to what was used in the day, which is pre 1973.
Using oversized tires is unacceptable and when in question, SVRA’s determination shall be
the final word.

Avon: ACB9, ACB10, CR6Z
Goodyear Eagle: 5.50/15 G12 or G12A
Hoosier: Street TD & Speedster
Any Treaded, DOT approved Tires with a UTQG of 100 or greater with appropriate
Speed Rating and a minimum Aspect Ratio of 45
Note: Group 8 must use approved full molded treaded tires, regardless of what
specification tires a car may have competed with in a prior race series.
For Toyo RA1’s and Nitto NT01’s, please see page 6 of this documen

Thanks in advance.
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Last edited by jmz; 09-07-2017 at 04:03 PM..
Old 09-07-2017, 03:26 PM
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jmz jmz is offline
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circling back on my own post. It sounds like Hoosier TDs will be the tire of choice for SVRA. If anyone else has any other thoughts please share.
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'74 Mexico Blue 911 3.0 EFI (Fast and Loud)
'70 914/6 Race Car (Faster and Louder)
'71 Alden Caravelle 42'(Slow and Quiet)
Old 09-08-2017, 07:56 AM
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Vintage tires

You will need to look at page 6 to see the reference, but I would look seriously at the NT01 or RA1 in the 225/45/15 size or 225/50/15.

Not sure of the grip of Hoosier TD but the RA1 and Nitto have very good grip and last well and likely cheaper than the Hoosiers

Greg
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Quote:
Originally Posted by phigreg View Post
You will need to look at page 6 to see the reference, but I would look seriously at the NT01 or RA1 in the 225/45/15 size or 225/50/15.

Not sure of the grip of Hoosier TD but the RA1 and Nitto have very good grip and last well and likely cheaper than the Hoosiers

Greg
I read over page 6 and RA-1 and the Nittos are not going to be allowed at all in 2018 which is causing my problems. I think Hoosier TD and Michelin TB series are possible options (The TB are like $400.00/ tire) but require a retune of my suspension. Looking for a radial that would work.
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'74 Mexico Blue 911 3.0 EFI (Fast and Loud)
'70 914/6 Race Car (Faster and Louder)
'71 Alden Caravelle 42'(Slow and Quiet)

Last edited by jmz; 09-13-2017 at 07:19 AM..
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I had some correspondance with Rick at SVRA and so far the R888R is not on the endangered list so I think I'll try them for the end of the year and next Spring.
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Jay
'74 Mexico Blue 911 3.0 EFI (Fast and Loud)
'70 914/6 Race Car (Faster and Louder)
'71 Alden Caravelle 42'(Slow and Quiet)
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I used the TD's back in my vintage days in a 70 ST replica. They required fairly soft spring rates because of the amount of sidewall flex. That said - the slip angles they can run at were fun.

They were a competitive tire so long as everyone was on vintage specs.

No idea if they are faster/slower than the RA1s though... As a bias ply its a very different world.
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following this thread, I've been debating the same dilemma for months now

I'm thinking about buying a set of TD tires over the winter

I hate to make that jump, because of the completely different set up required
I don't want to switch set ups depending on which group I am running with
so considered going both feet in with a bias ply at my home race organization too.

brant
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What do you recommend for tire pressures for the Hoosier TD's ?
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http://www.bobwoodmantires.com/wp-content/uploads/2014/10/Hoosier-pressures.pdf
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RA1's were the goto when at COTA with SVRA a few years ago. Not sure if they nixed them. I could not run them on my car becasue they were not wide enough.
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