Fender clearance?

Kegracing · 06-26-2010, 03:36 PM

What is the minimum clearance on the front and back side of the fender opening you would recommend on a stocker. Would like to hear answers for both radial and bias 9" slicks.

I currently have a tall bias slick on it, and 1/4" of space... not enough... rubbing on the center of the tread face.

This is a 67 Firebird if it matters. Would like to hear the "been there and done that" stories before I start bending and cutting...

Thanks in advance everyone!

Ken

Lew Silverman · 06-26-2010, 04:51 PM

The "book" says you can trim the leading and trailing edges a maximum of 2 inches for clearance. Is your 1/4 inch just in the front of the tire or both sides? You might be able to re-drill the spring perch to center the axle in the wheel well. That's what I had to do on the old Nova.

Good luck!

Lew

Kegracing · 06-26-2010, 06:06 PM

Thanks Lew.
The front fender is at 1/4", rear has about 1 1/2" inches, so centering in wheel well is an option, depending on what the overall need is...

The fenders are stock at this point. Have not cut anything at all yet. Would rather not, but need to be able to safely put the tire in there is the top prioriety.

thanks again,

Ken

Tom keedle · 06-26-2010, 06:49 PM

DOESN'T THAT ALTER THE WHEELBASE ?(sorry bout the caps)?
and is THAT legal?

Alan Roehrich · 06-26-2010, 07:02 PM

Before you move the axle, you better check your wheelbase. There are specs and limits on wheelbase, and they do measure it.

Run to Rund · 06-27-2010, 11:37 AM

I saw some rubbing with 1.25" clearance for Hoosier 30x9 bias, 116 mph, 8" wheels. I hear the tires don't grow as much with 10" wheels.

cad · 06-28-2010, 10:44 AM

We're researching the same to determine if we can run a 30x9.

Steve at Hoosier tire:
The radial does not grow. It is easier to spin if the track is not good.
The Bias tire will grow about 3" in circumference, or about 1" in diameter, on the 8" or 10" wheel at 120MPH. You will get more runs from the bias tire.

They recommend the same burn out for both tires. The 10" wheel will give a slightly flatter footprint meaning a little more rubber on the ground, not a big difference.

Ed Wright · 06-28-2010, 11:45 AM

Cad, that info agrees exactly with my experience.

tom51 · 07-11-2010, 09:13 AM

68 camaro..trimmed quarter panel in front for more clearance. you may need to cut the rear too. i also made steel wedge plates and moved my rear back about 1/4 inch or less..no more rubbing now. or you can make a few runs and watch the smoke fly at the end of the track. tires get smaller with each rub..

Ian Hill · 07-16-2010, 06:17 AM

Not a nova, but on my chevelle i have about a 1/4" of clearance on the front side. i run the 92" roll out 30X9 radials. I can also run 27 pounds of air in them if the track is there, to a .92 under. I currently run 22 pounds of pressure for testing during regular bracket racing days at my track. These are on a 8" rim, running 5.13 gears and 2.75 first gear. I wish they made them in a 30 x 7 radial, i'd probabley mph like crazy! (i/cm).

06-26-2010, 03:36 PM	#1
Kegracing Member Join Date: Jun 2002 Location: Red Oak, TX Posts: 441 Likes: 0 Liked 0 Times in 0 Posts	Fender clearance? What is the minimum clearance on the front and back side of the fender opening you would recommend on a stocker. Would like to hear answers for both radial and bias 9" slicks. I currently have a tall bias slick on it, and 1/4" of space... not enough... rubbing on the center of the tread face. This is a 67 Firebird if it matters. Would like to hear the "been there and done that" stories before I start bending and cutting... Thanks in advance everyone! Ken

06-26-2010, 04:51 PM	#2
Lew Silverman VIP Member Join Date: Mar 2010 Location: Newport News, VA Posts: 1,435 Likes: 371 Liked 129 Times in 59 Posts	Re: Fender clearance? The "book" says you can trim the leading and trailing edges a maximum of 2 inches for clearance. Is your 1/4 inch just in the front of the tire or both sides? You might be able to re-drill the spring perch to center the axle in the wheel well. That's what I had to do on the old Nova. Good luck! Lew __________________ Lew Silverman #2070 "The Wagon Master" N/SA

06-26-2010, 06:06 PM	#3
Kegracing Member Join Date: Jun 2002 Location: Red Oak, TX Posts: 441 Likes: 0 Liked 0 Times in 0 Posts	Re: Fender clearance? Thanks Lew. The front fender is at 1/4", rear has about 1 1/2" inches, so centering in wheel well is an option, depending on what the overall need is... The fenders are stock at this point. Have not cut anything at all yet. Would rather not, but need to be able to safely put the tire in there is the top prioriety. thanks again, Ken

06-26-2010, 06:49 PM	#4
Tom keedle Senior Member Join Date: Dec 2008 Location: Berthoud, Coloraduh Posts: 695 Likes: 13 Liked 8 Times in 7 Posts	Re: Fender clearance? DOESN'T THAT ALTER THE WHEELBASE ?(sorry bout the caps)? and is THAT legal?

06-26-2010, 07:02 PM	#5
Alan Roehrich Veteran Member Join Date: May 2006 Location: Murfreesboro TN Posts: 5,105 Likes: 1,564 Liked 1,789 Times in 408 Posts	Re: Fender clearance? Before you move the axle, you better check your wheelbase. There are specs and limits on wheelbase, and they do measure it. __________________ Alan Roehrich 212A G/S

06-27-2010, 11:37 AM	#6
Run to Rund Senior Member Join Date: Sep 2007 Location: Henderson, NV Posts: 583 Likes: 8 Liked 54 Times in 27 Posts	Re: Fender clearance? I saw some rubbing with 1.25" clearance for Hoosier 30x9 bias, 116 mph, 8" wheels. I hear the tires don't grow as much with 10" wheels.

06-28-2010, 10:44 AM	#7
cad Senior Member Join Date: Apr 2009 Location: Omaha, NE Posts: 701 Likes: 200 Liked 91 Times in 51 Posts	Re: Fender clearance? We're researching the same to determine if we can run a 30x9. Steve at Hoosier tire: The radial does not grow. It is easier to spin if the track is not good. The Bias tire will grow about 3" in circumference, or about 1" in diameter, on the 8" or 10" wheel at 120MPH. You will get more runs from the bias tire. They recommend the same burn out for both tires. The 10" wheel will give a slightly flatter footprint meaning a little more rubber on the ground, not a big difference.

06-28-2010, 11:45 AM	#8
Ed Wright Veteran Member Join Date: Mar 2005 Location: Sand Springs, OK Posts: 8,132 Likes: 896 Liked 390 Times in 170 Posts	Re: Fender clearance? Cad, that info agrees exactly with my experience. __________________ Ed Wright 4156 SS/JA

07-11-2010, 09:13 AM	#9
tom51 Junior Member Join Date: May 2010 Posts: 2 Likes: 0 Liked 0 Times in 0 Posts	Re: Fender clearance? 68 camaro..trimmed quarter panel in front for more clearance. you may need to cut the rear too. i also made steel wedge plates and moved my rear back about 1/4 inch or less..no more rubbing now. or you can make a few runs and watch the smoke fly at the end of the track. tires get smaller with each rub..

07-16-2010, 06:17 AM	#10
Ian Hill Member Join Date: Sep 2008 Posts: 216 Likes: 0 Liked 6 Times in 3 Posts	Re: Fender clearance? Not a nova, but on my chevelle i have about a 1/4" of clearance on the front side. i run the 92" roll out 30X9 radials. I can also run 27 pounds of air in them if the track is there, to a .92 under. I currently run 22 pounds of pressure for testing during regular bracket racing days at my track. These are on a 8" rim, running 5.13 gears and 2.75 first gear. I wish they made them in a 30 x 7 radial, i'd probabley mph like crazy! (i/cm).

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