Yellow isnt. It has like 4 hours of use time , while the grey is 1.5hours of use. Some can use them for a longer while but this is what mike swauger says for racing. I hear some people never change them and from what they say on the forum. "Run Fine" But Ive also heard people say that Elvis talks to them in their cereal, so.
The yellow engagement is less snappy. The grey is the most aggressive disc. Definently worth use at a high grip track.
Yellow and Red are about equal. The yellow just came out last year so its the latest disc to come out as well. I dont buy red anymore due to the fact yellow is out.
Last edited by Artificial-I; 04-22-2007 at 05:52 AM.