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Old 09-29-2004, 06:01 AM   #1
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Default Scrub Radius

Hello Setup Gurus:

What is scrub radius?

How does it affect steering?

Last edited by rough512; 09-29-2004 at 07:45 AM.
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Old 09-29-2004, 06:51 AM   #2
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i think its when when the tire flubs over ie:it rolls over itself italso might be when the tire scrapes on the bumper/chassis/bodie once again im not sure
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Old 09-29-2004, 07:03 AM   #3
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It has something to do with the distance from the kingpin to the hex hub... but I'm not sure...

I'm wondering about it's effect on steering. I'm using the original Xray T1 where the front pivot balls are very near the center of the contact patch of the front tires.

When the T1 first came out, people were saying that the steering is very aggressive.

Now that most people are using the C-Hubs, the general consensus is that the C-Hubs are better than the Pivot Balls.

Just wondering whether the tire scrub has anything to do with it.



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Old 09-29-2004, 07:10 AM   #4
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i also use an xray but i use the c hubs sorry i couldent help
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Old 09-29-2004, 07:42 AM   #5
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the scrub radius is defined as the distance from the kingpin axis to the center plane of the wheel. as the steering is turned, the wheel swings about from the kingpin axis. the scrub radius quantifies how far from the pivot the arc that it makes is located. i have not played with this, but i would suspect the result or feel is very similar to castor changes. a larger scrub radius will eccentuate what castor is in the car, since the wheel will lift or sink more due to the greater arc it makes. ie. - large scrub radius will give the car better high speed steering, but might unsettle the car during quicker switchbacks? i really don't know.

talk to some karting gurus, as i understand that is a method of tuning that come into play there.
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Old 09-29-2004, 07:45 AM   #6
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I'm googling up the term now...

Yes I'm actuall referring to scrub radius. Thanks.



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