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Old 04-14-2017, 06:56 AM   #1
Chris1529
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Default Bias vs Radial slick

I have 28 x 9 M/T Bias slicks on my car right now. If I switch to a 28" Radial, can I expect much finish line RPM difference? Anyone have any finish line RPM info they can share when switching from Bias to Radial on the same size advertised tire on?
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Last edited by Chris1529; 04-14-2017 at 06:59 AM.
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Old 05-07-2017, 11:15 PM   #2
LemonWedge
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Default Re: Bias vs Radial slick

The 28x9 MT ET Drags measure 27-1/2" according to MT. Depending on how fast you are, it likely grows to 28" or even a little beyond. A radial won't grow. So if the radial you're looking at is exactly 28", you likely won't see much change in stripe RPM.

The key here is that bias tires grow while radials do not.
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Old 05-12-2017, 08:53 PM   #3
Mike Rietow
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Default Re: Bias vs Radial slick

Quote:
Originally Posted by Chris1529 View Post
I have 28 x 9 M/T Bias slicks on my car right now. If I switch to a 28" Radial, can I expect much finish line RPM difference? Anyone have any finish line RPM info they can share when switching from Bias to Radial on the same size advertised tire on?
The bias has high energy losses at all frequencies (deformation). The Radial will have low energy loss at low frequency which means less resistance to roll. Less rolling resistance means more mph. More mph requires more rpm. How much more rpm? ... How much more mph?
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