Wear on slicks

derek · 02-11-2014, 07:38 PM

I was running with pirelli slicks yesterday that had only done couple of track days. Started to get some vibration and the front left and the outer edge have raised ridges evenly spread around the wheels across approx 2-3 inches of the width of the tyre from the outside. Swapped front around and the ridges developed again on front left. I was running about 28psi and -3.5 degrees camber. Anyone seen this before.

**DazBlackCSL** · 02-11-2014, 08:35 PM

Slicks make you feel every single inch of the road Derek .. Pick up any shit and you'll feel it .. Over brake and flat spot em and you'll feel it.

Wouldn't worry about vibration, difficult to really see in the pics, tyres look a little lumpy and that you've picked up a fair bit of rubber on the shoulders

derek · 02-11-2014, 08:47 PM

It's the two edges in the middle of pics that are the outer edges of the wheels. the ridges are quite big and are equidistant around the edges. It's like mini speed humps all around the outer edge of tyres never seen this before.

**shimmy** · 02-11-2014, 09:30 PM

if i were to guess, and it is a guess, id say you need way more neg camber

Chappers · 02-11-2014, 09:51 PM

I have to say I'm amazed you can use slicks on a standard road car, I'd have thought it's break all sorts of things. Madness.

derek · 02-11-2014, 09:57 PM

Quote:

Originally Posted by shimmy

if i were to guess, and it is a guess, id say you need way more neg camber

Anyone running more than -3.5 car was going well before the vibration started

rstoughy · 02-11-2014, 10:01 PM

What sort of times were you setting with the slicks Derek?
I spent all Tues PM there testing in the rain.

**shimmy** · 02-11-2014, 10:06 PM

Quote:

Originally Posted by derek

Anyone running more than -3.5 car was going well before the vibration started

-3.5 is very low for slicks, more like cup camber

derek · 02-11-2014, 10:08 PM

Best was 60.7 done 60.2 on same tyres last month car is about 5mph slower on main straight than Csl it's just under a sec slower than best Csl time

derek · 02-11-2014, 10:09 PM

Quote:

Originally Posted by shimmy

-3.5 is very low for slicks, more like cup camber

I was using the Simpson setup you gave me several years ago any recommendations for camber on slicks

02-11-2014, 08:35 PM	#2
DazBlackCSL CSL Register Uber-poster! Join Date: Apr 2008 Location: Shaboogling Posts: 7,199 Casino cash: $28478	Slicks make you feel every single inch of the road Derek .. Pick up any shit and you'll feel it .. Over brake and flat spot em and you'll feel it. Wouldn't worry about vibration, difficult to really see in the pics, tyres look a little lumpy and that you've picked up a fair bit of rubber on the shoulders __________________ CSL Register Lifestyle Coach and Social Secretary Last edited by DazBlackCSL; 02-11-2014 at 08:38 PM.

02-11-2014, 09:30 PM	#4
shimmy CSL Register Uber-poster! Join Date: Apr 2008 Location: Uk Posts: 14,646 Casino cash: $43909	if i were to guess, and it is a guess, id say you need way more neg camber __________________ .

02-11-2014, 10:01 PM	#7
rstoughy S6, Sport On, Traction Off Join Date: Jun 2008 Location: Aberdeenshire Posts: 1,947 Casino cash: $25387	What sort of times were you setting with the slicks Derek? I spent all Tues PM there testing in the rain. __________________ Paul. Ooooft!!! 15yrs in the CSL and still loving it "shine on you crazy diamond"

02-11-2014, 08:47 PM	#3
derek S5, Sport On, DSC M-track Join Date: Jun 2008 Location: Scotland Posts: 1,159 Casino cash: $20658	It's the two edges in the middle of pics that are the outer edges of the wheels. the ridges are quite big and are equidistant around the edges. It's like mini speed humps all around the outer edge of tyres never seen this before.

02-11-2014, 09:51 PM	#5
Chappers S5 - Full Throttle Join Date: Apr 2014 Posts: 388 Casino cash: $9894	I have to say I'm amazed you can use slicks on a standard road car, I'd have thought it's break all sorts of things. Madness.

02-11-2014, 10:08 PM	#9
derek S5, Sport On, DSC M-track Join Date: Jun 2008 Location: Scotland Posts: 1,159 Casino cash: $20658	Best was 60.7 done 60.2 on same tyres last month car is about 5mph slower on main straight than Csl it's just under a sec slower than best Csl time