Originally Posted by
Bob Dopolina
The BLACK CHILI compound found in the GP4000s and the BLACK GP4000 is not compatible with the Silica based compounds used to make the coloured versions of these tires.
If you feel that BLACK CHILI is a superior compound to their older silca based tires then your friend is correct (I agree with him).
Is "Black Chili" just a fancy name for the carbon rubber that has been used in bicycle and car tires for 100 years? Carbon rubber (natural rubber mixed with carbon black) is proven to have good wet weather grip and good durability.