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Now that I have your attention, what is the physics or chemistry behind tire squeal and chirping? :shrug: I rode on track with someone recently with "street tires". He was driving aggressively, and the squealing was almost constant. R compounds don't seem to make much noise until they are considering breaking loose. Does the rubber just come off more easily with R compounds?
 

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Squealing or chirping is the noise that it makes when the tire is slipping against the asphalt or concrete. In the case of the back tires (assuming it's RWD), it means that he's not able to put 100% of the power down to the pavement. In the case of the front tires, it means he has severe understeer.

R compounds are softer (i.e. lower treadwear rating) so you would definitely leave more rubber on the pavement when driven as compared to tires with a high treadwear rating.
 
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