DNA Shred Stix/Star Racing/Yamahas Ryan Sipes will miss Round 4 of the upcoming Lucas Oil AMA Pro Motocross Championship at Budds Creek. According to a team report, "Ryan was checked out and diagnosed with a concussion. At this time he’ll sit the next round but is confident that he’ll be racing the Thunder Valley race in Colorado coming in two weeks." Stay tuned to Racer X Online for more information.