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Motorsports & Track Forum
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Old 05-08-2013, 02:20 PM   #21
SK330ci
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GRM just released their tire testing article between the ZII and the Rival, with the Toyo R1R as a benchmark. Summary of it is that the Rival is a BOSS! Great tire at all psi, handles heat well, and they are tolerant of large slip angles. The ZII seems to be a more finicky tire that is more setup and heat dependent.

Now I kind of wish I got the Rivals, but nonetheless I can't wait to run my ZIIs in June

I just went to the GRM site, looks like you need a $20 dollar subscription to see things.

Can you copy and paste this tire test on here, I'd really like to read it.

Thanks.
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Old 05-09-2013, 10:21 AM   #22
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I've given this a lot of thought. I think after researching this, your answer is your 235/40-17. From a weight, gearing & Neg. camber stand point it's a winner over your other size choices. Brand consideration, well that could still go way few different ways; my choice is still the Hankook RS-3.
Thanks for your feedback!
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Old 05-09-2013, 10:33 AM   #23
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Go for the 17s with the 235s. Why do you have to reduce camber if you run a wider tire? Should be the other way around...run more camber with a wide tire
Each 'mod' done to the car increases your base points in the club I run with. If I add more camber or tire width, it would push me to a faster class unless I drop points somewhere else.

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The ZII seems to be a more finicky tire that is more setup and heat dependent.
The reviews seem to support this. I find it difficult to control a slide with the Z1s at different temperatures or pressures sometimes. Back to back runs with the Z1s almost never feel the same.
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Old 05-09-2013, 04:01 PM   #24
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Originally Posted by SK330ci View Post
I just went to the GRM site, looks like you need a $20 dollar subscription to see things.

Can you copy and paste this tire test on here, I'd really like to read it.

Thanks.
Sure, I will do that now

edit: http://www.sendspace.com/file/v22cwv

Sorry about the quality, the way the reader works I couldn't get the typical 1 page/screen
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Old 05-09-2013, 07:13 PM   #25
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Sure, I will do that now

edit: http://www.sendspace.com/file/v22cwv

Sorry about the quality, the way the reader works I couldn't get the typical 1 page/screen
Thanks, it's plenty good enough.

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Old 05-11-2013, 09:46 PM   #26
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I've heard the ZIIs aren't much different than the Z1s. I'm still quite sure that the RS3s > all for warm, dry grip. I think they increased the UTOQ to 200 so you can run them in Chump car now as well. Not sure if that has any affect on your auto-xing.

The downer with the RS3s is they are noisy, not so good wet grip, terrible in cold weather.
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Old 09-18-2013, 10:17 AM   #27
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How about cold weather grip? Which of the tires mentioned above will grip best around 50 degrees F?

I have two more autox at the end of October when it starts to get pretty chilly in NE.

I have a set of 235/40/17 AD08's that I can use....bad choice for a colder race?

Last edited by Kubica; 09-18-2013 at 12:40 PM.
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