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Old 03-08-2009, 03:10 PM   #1
operating engineer
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Default Too cold for R compound?

First event is coming up next Sat. Forcast is 44 degrees high, what you guys think? I'm running Hankook Z214 245/40/18 (c70), which I gotta scub in Tuesday. Should I just stick with the stock Dunlop in this temp.
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Old 03-08-2009, 03:18 PM   #2
sachilles
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You'll have a tough time getting those up to temp, I'd skip using them this time around.
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Old 03-09-2009, 07:42 AM   #3
Craigs
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In the dry, R compounds will always be softer and thus faster than street tires.
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Old 03-09-2009, 07:53 AM   #4
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Start with high air pressures to help get the tires up to temp.
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Old 03-09-2009, 09:26 AM   #5
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High pressures will get a single area on the tire up to temp, but will be harder to build the temp up across and through the tire. Lower pressures give less air to heat up heating up a tire faster (then there is also more flex which heats up the tire faster)

I would leave the pressures alone - maybe drop them a pound or two, and just give the first run extra caution.

I have run R-comps when it was as low as 29' outside and that was for a roadrace. For an autocross, I would probably abandon them below 35' but above that I would take my chances.


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Old 03-09-2009, 09:46 AM   #6
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I'll problably run them, I'm sure I won't be the only nut out there with them on
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Old 03-09-2009, 10:56 AM   #7
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you'll be just fine.
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