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CAinCA
CAinCA GRM+ Memberand HalfDork
6/3/22 1:34 p.m.

On my way home from the track the other day I noticed that there was a bit of vibration coming through the steering wheel. I took it as the tell tale sign that my tires had picked up some clag on my cool down lap. This morning I put the street pads back on the car and sure enough there were a couple big patches of clag stuck to the front tires. One patch was at least 2" x 3" and roughly 3/16" thick. I tried using a gasket scraper big it was hard to keep it from digging into the tire itself. Then I remembered that I had a spokeshave that I inherited from my grandfather. I rolled the tire up against my workbench, held the shave at a 45 degree angle and carefully shaved off the chunks of rubber.

 

One of the smaller bits of clag.

 

Hold the shave at a 45 degree angle and push AWAY from yourself.

 

All done.

stafford1500
stafford1500 GRM+ Memberand Dork
6/3/22 1:47 p.m.

Why do pit crews take a blowtorch and scraper to tires that come off of  stock cars? - Quora

dps214
dps214 Dork
6/3/22 2:20 p.m.

Oscillating multitool, sometimes I forget they have uses other than rubber buildup removal.

Alternativelyt, if you notice it when the tire/rubber are hot (like right after coming off track) you can usually just peel it off by hand.

codrus (Forum Supporter)
codrus (Forum Supporter) GRM+ Memberand PowerDork
6/3/22 4:02 p.m.

I have used a curry comb for this in the past.

https://www.amazon.com/gp/product/B000HHODD6/

Entropyman
Entropyman GRM+ Memberand Reader
6/3/22 4:28 p.m.

I used a heat gun and painter's tool with good results.

CAinCA
CAinCA GRM+ Memberand HalfDork
6/3/22 5:16 p.m.

I didn't think about heating it up. I'll have to try that next time.

Sonic
Sonic UberDork
6/3/22 5:31 p.m.

How about an old fashioned burnout?

dannyzabolotny
dannyzabolotny Reader
6/3/22 5:44 p.m.

With my A052's I just leave it on and it all scrubs off after a few hot laps.

Appleseed
Appleseed MegaDork
6/3/22 9:20 p.m.

TIL that clag isn't a word made up on the spot

Floating Doc (Forum Supporter)
Floating Doc (Forum Supporter) GRM+ Memberand PowerDork
6/3/22 9:31 p.m.
Appleseed said:

TIL that clag isn't a word made up on the spot

It's a new one to me. I've always heard it referred to as OPR, or other people's rubber. 

Cactus
Cactus HalfDork
6/3/22 10:50 p.m.
Appleseed said:

TIL that clag isn't a word made up on the spot

Those bloody F1 tea-sippers call them marbles, but it's clag here in freedom land.

 

I've never had any that didn't just come off when driving normally. It's pretty cool that they make street tires that'll pick that stuff up now.

CAinCA
CAinCA GRM+ Memberand HalfDork
6/4/22 2:11 a.m.
Entropyman said:

I used a heat gun and painter's tool with good results.

I cleaned up the rear tires using this method this afternoon. It works really well. 

CAinCA
CAinCA GRM+ Memberand HalfDork
6/4/22 2:14 a.m.
Appleseed said:

TIL that clag isn't a word made up on the spot

David Hobbs used it on the F1 broadcasts all of the time. 

GCrites80s
GCrites80s Dork
6/5/22 8:34 p.m.
Cactus said:
Appleseed said:

TIL that clag isn't a word made up on the spot

Those bloody F1 tea-sippers call them marbles, but it's clag here in freedom land.

NASCAR calls them marbles too.

jwagner (Forum Supporter)
jwagner (Forum Supporter) GRM+ Memberand Reader
6/5/22 11:09 p.m.

At my first and only AX nationals, I had the lofty job of spraying the circle where people would scrub off OPR.  Doing a couple of loops on a really wet surface seemed to clean most of the junk off that was picked up during a run.  Not sure how well this works once the OPR is baked into the tire though.

stuart in mn
stuart in mn MegaDork
6/5/22 11:25 p.m.

Strictly speaking that's a drawknife, not a spokeshave.

dean1484
dean1484 GRM+ Memberand MegaDork
6/6/22 7:11 a.m.
GCrites80s said:
Cactus said:
Appleseed said:

TIL that clag isn't a word made up on the spot

Those bloody F1 tea-sippers call them marbles, but it's clag here in freedom land.

NASCAR calls them marbles too.

Never heard that term. Still going to call them marbles but kind of cool. 

David S. Wallens
David S. Wallens Editorial Director
6/8/22 10:53 a.m.

I recently learned that tight loops around a cul-de-sac won't really remove clag. 

hunter47
hunter47 Reader
6/8/22 11:24 a.m.

In reply to dannyzabolotny :

Same here, never had an issue just burning it off from driving. 

Sonic said:

How about an old fashioned burnout?

That's the key to this

Tom1200
Tom1200 UltraDork
6/8/22 1:28 p.m.

Things one shouldn't admit; when I tracked a street car, the first on ramp usually cleaned off the tires

Pete. (l33t FS)
Pete. (l33t FS) GRM+ Memberand MegaDork
6/8/22 1:44 p.m.
GCrites80s said:
Cactus said:
Appleseed said:

TIL that clag isn't a word made up on the spot

Those bloody F1 tea-sippers call them marbles, but it's clag here in freedom land.

NASCAR calls them marbles too.

On the track, not the tire, right?

kevinatfms
kevinatfms GRM+ Memberand HalfDork
6/8/22 2:40 p.m.

Everyone calling it "clag" and "marbles".....while im over here calling it OPR(other peoples rubber). 

GCrites80s
GCrites80s Dork
6/8/22 3:57 p.m.
Pete. (l33t FS) said:
GCrites80s said:
Cactus said:
Appleseed said:

TIL that clag isn't a word made up on the spot

Those bloody F1 tea-sippers call them marbles, but it's clag here in freedom land.

NASCAR calls them marbles too.

On the track, not the tire, right?

I would say more on the track, yes.

Pete. (l33t FS)
Pete. (l33t FS) GRM+ Memberand MegaDork
6/8/22 9:22 p.m.
kevinatfms said:

Everyone calling it "clag" and "marbles".....while im over here calling it OPR(other peoples rubber). 

Gotta get some pics of the tires we got from an autocrosser moving away from 13" wheels on his Miata.  They have asphalt stuck to them.  Big sheets of asphalt, across most of the width.

 

It's an Ohio Valley region thing.  One of the lots they (used to?) use was bad for that.

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