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      06-05-2014, 08:17 PM   #1
Wendall
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Square set up and balding pair of tires.

So i got an extra set of track wheels arc 8s 18x10 square. two of my tires are 3.5/32nds and the other two are fresh 6/32nds (all toyo r888s)

I figure the worn tires still have a good track day in them. My question is should i run them in the front or the rear?
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      06-05-2014, 08:37 PM   #2
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My understanding is that the more worn tires should go on the front of the car, as then understeer will occur (vs. oversteer if they were on the rear) at the limit. Now, this is the norm for street tires on normal cars where understeer is a lot safer than oversteer for 95% of drivers.

Would you rather deal with under or over steer is the question I think.
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      06-06-2014, 12:22 AM   #3
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Definitely put the better grip up front where you need it for turn in. You can adjust for the rear but without turn in you've got nothing.
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      06-06-2014, 07:55 AM   #4
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Multiple possibilities here. If the worn tires are well heat cycled, the fresh ones likely have more grip. Then it's your choice which end of the car you want place them based on that steady state grip level. However, note that the new tires (esp 888s compared to other R-comps) will be significantly more "squirmy", hence if you place them on the rear, you will increase transient oversteer. If you want more rotation on turn-in, that will likely achieve it for you...just be careful until you get the sense of how it is handling in transient conditions.
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      06-06-2014, 11:00 AM   #5
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Thanks for all of your responses. Looks like I will try the fresh tires in the rear first. I'll heatcycle the rear until they grip better and then determine if I need to swap them around
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      06-06-2014, 08:47 PM   #6
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Quote:
Originally Posted by okusa View Post
Definitely put the better grip up front where you need it for turn in. You can adjust for the rear but without turn in you've got nothing.
+1
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      06-07-2014, 07:46 AM   #7
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Quote:
Originally Posted by OC3
Quote:
Originally Posted by okusa View Post
Definitely put the better grip up front where you need it for turn in. You can adjust for the rear but without turn in you've got nothing.
+1
+2

Opposite of what you would do with a street car and street tires.
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      06-07-2014, 11:31 PM   #8
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Quote:
Originally Posted by surlynkid View Post
Quote:
Originally Posted by OC3 View Post
Quote:
Originally Posted by okusa View Post
Definitely put the better grip up front where you need it for turn in. You can adjust for the rear but without turn in you've got nothing.
+1
+2

Opposite of what you would do with a street car and street tires.
Yep.
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