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13" tires for autocross/track/street


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I run Hoosier bias ply slicks on my 2000 yellow car.  The ten inch wide ones were THE auto cross tire in the R25B compound.   When I switched to tracking the car I used the same tire and compound but did go with a slightly larger Circumference tire to give me a little higher top end.  Look at my signature pic to get an idea.  
I can run the ten inch wide slicks as they fit easily under the clams.  
 

I run Michelin radial slicks on my Orange car,  and there is a difference to me in feel as the bias ply slicks seem more progressive to me vs the radials.  Then again the Michelin’s aren’t ten inch wide.  Maybe nine at the rear.
 

 

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+1 for Hoosier slicks for the track, the Hoosier Formula 2000 radials 43370/43380 R35 compound are about 5 seconds faster than the ZZRs at Barber. They also started selling R55 compound recently. 

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14 hours ago, Pokey said:

....but researching further it looks like Hoosier bias slicks will retain the same ride height as the ZZS/ZZR.  I find this attractive as switching back and forth won't require suspension changes.  

 

@Pokey  Correct - I selected to continue the same rolling diameter as the Avon ZZR/ZZS as I did not want to have any suspension changes or inadvertant gearing effects.  I could add some negative camber on the front to enhance the way the Hoosiers work but I have not felt the need for that.  

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Just to mix things up: I run 15” wheels in back, (225/45/15) and 13” up front(185/65/13), with Hoosier R7s(in the dry only). Pure track car. It came with the staggered set up from Beachman Racing, which  prepped it for the track.

 

When I bought it in 2012, Goodyear cantilevered slicks were the race tire of choice. My front tire AND wheel combo weighed in around 19lbs. Unfortunately, Goodyear stopped making those tires. The Hoosiers R7s are not as good, but very close.

 

As I recall, the bias ply Hoosiers provided the best grip and were the most forgiving (no sudden break-aways at the limit). And are lighter. But didn’t last as long.  But this was back “ in the day” and radial tires have kept getting better, so?

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image.png.b9b0f200b303eb7e956ea9b096e52df1.png

On 6/30/2021 at 6:22 AM, Kitcat said:

Just to mix things up: I run 15” wheels in back, (225/45/15) and 13” up front(185/65/13), with Hoosier R7s(in the dry only). Pure track car. It came with the staggered set up from Beachman Racing, which  prepped it for the track.

 

@Kitcat, the 15" rears are an interesting idea.  I wonder if Bruce went that way for the selection of tires available or for gearing - my final gear is 3.91 so the 2" increase in diameter over my 215/55x13 rears might be nice for the track.

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Since mine was set up for SCCA racing, he had to comply with their (arbitrary) rules. The Caterham wheels were limited to 13x6” in the rear, 13x5.5 in the front. So clever tire mfgs came up with huge, cantilevered tires that fit on the tiny rims.
 

Unfortunately, they stopped making those tires. So I switched to 15x7 wheels with 225/45-15 tires. This approximated the dimensions of the cantilevered tire. But the replacements were still not as wide as the cantilevered tires. And the new  set up added 10lbs, per corner (24lbs. v. 34  lbs).

 

Here is a side by side shot, with the Goodyear cantilevered slicks on the right, the 15” R7’s on the left. And a shot of the muffin-top style of the Goodyear’s.

74BC585B-1C27-436F-A1F3-D4DBB08FF629.jpeg

AB72F957-7E8F-4731-9EF6-AFA6CC2C8B04.jpeg

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  • 2 weeks later...

Just to tie a bow around this one, I decided on the ZZR.  I had also asked Mr. Beachman his thoughts on tires, and with my relative lack of track experience he suggested I stay away from slicks for now.  Coincidentally, Caterham emailed the same day Bruce responded letting me know the ZZR were finally in stock so I placed an order before they sold out again.

 

 

IMG_6189.JPG

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