Bias vs Radial Slick

Chris1529 · 04-14-2017, 07:58 AM

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?

J.R. Haddad · 04-14-2017, 08:15 AM

Chris, what size rim?

Chris1529 · 04-14-2017, 08:20 AM

8"

J.R. Haddad · 04-14-2017, 08:34 AM

Chris, with an 8" rim you're getting reasonable growth with the Bias
tire. You will get next to no growth with the radial tire. That should result
in 3-400 more finish line RPM. J.R.

Rory McNeil · 04-14-2017, 10:12 AM

Quote:

Originally Posted by J.R. Haddad

Chris, with an 8" rim you're getting reasonable growth with the Bias
tire. You will get next to no growth with the radial tire. That should result
in 3-400 more finish line RPM. J.R.

.........Except unless M/T has recently changed this, the 9X28 bias slick is actually less than 27 1/2 inches tall. So the finish line RPM may be fairly close.

Chris1529 · 04-14-2017, 11:48 AM

27.3" dia with 86" circumference for the bias, 28"dia with 87.8 circumference for the pro-bracket radial.

Dan Fahey · 04-14-2017, 12:48 PM

Run 28x9 M/T Bias and Radial ProBracket...
Only noticed a bit more stability at 100-105 mph with the Radial

Saw some ET improvement. Not much.

MR DERBY CITY · 04-14-2017, 06:04 PM

Quote:

Originally Posted by Chris1529

27.3" dia with 86" circumference for the bias, 28"dia with 87.8 circumference for the pro-bracket radial.

Chris, you will notice around 200 rpm difference.....possibly a little less

04-14-2017, 07:58 AM	#1
Chris1529 VIP Member Join Date: Dec 2006 Location: West Virginia Posts: 1,366 Likes: 6 Liked 70 Times in 29 Posts	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? __________________ Chris Bowman The Mountain State Mustang 1984 Mustang GT350

04-14-2017, 08:15 AM	#2
J.R. Haddad Senior Member Join Date: Jun 2012 Posts: 780 Likes: 920 Liked 1,453 Times in 306 Posts	Re: Bias vs Radial Slick Chris, what size rim?

04-14-2017, 08:20 AM	#3
Chris1529 VIP Member Join Date: Dec 2006 Location: West Virginia Posts: 1,366 Likes: 6 Liked 70 Times in 29 Posts	Re: Bias vs Radial Slick 8" __________________ Chris Bowman The Mountain State Mustang 1984 Mustang GT350

04-14-2017, 08:34 AM	#4
J.R. Haddad Senior Member Join Date: Jun 2012 Posts: 780 Likes: 920 Liked 1,453 Times in 306 Posts	Re: Bias vs Radial Slick Chris, with an 8" rim you're getting reasonable growth with the Bias tire. You will get next to no growth with the radial tire. That should result in 3-400 more finish line RPM. J.R.

04-14-2017, 11:48 AM	#6
Chris1529 VIP Member Join Date: Dec 2006 Location: West Virginia Posts: 1,366 Likes: 6 Liked 70 Times in 29 Posts	Re: Bias vs Radial Slick 27.3" dia with 86" circumference for the bias, 28"dia with 87.8 circumference for the pro-bracket radial. __________________ Chris Bowman The Mountain State Mustang 1984 Mustang GT350

04-14-2017, 12:48 PM	#7
Dan Fahey VIP Member Join Date: Oct 2008 Posts: 2,127 Likes: 1,084 Liked 184 Times in 113 Posts	Re: Bias vs Radial Slick Run 28x9 M/T Bias and Radial ProBracket... Only noticed a bit more stability at 100-105 mph with the Radial Saw some ET improvement. Not much.