Stanford is their biggest rival. The other California Pac 10 schools are next, followed by the other Pac 10 schools.l
The 49ers have had many rivals throughout their history. In the 1970's and the early 1980's their biggest rival was the Dallas Cowboys. Throughout the 1980's and early 1990's their chief rival was the New York Giants who they played in the playoffs numerous times. Then, in the early 1990's Dallas became great again, and the Cowboy-49ers rivalry renewed in a big way. After that, in the mid 1990's the Green Bay Packers with Bret Favre emerged as a big rival. Today, the 49ers biggest rival is fellow NFC West team, and recent Super Bowl Champion, the Seattle Seahawks.
Sebulba. He was a former slave, pulled from obscurity because of his amazing pod-racing skills.
One of his rivals is Draco Malfoy, and two of his friends. His only real rival, I believe, is Draco Malfoy. I'm not quite sure about the two friends mentioned above since I have no idea who those are supposed to be.
A rival is someone or a group who are your competition.
Comcast is their biggest rival.
The UNITED KINGDOM was Napoleon's biggest national rival.
Ben Johnsons biggest rival was Carl Lewis
UVA
roma
Mercedes
Minnesota Vikings
Texas tech
Pat Boone
France!
Pabst
Probably the Boston Red Sox are the Yankees biggest rival.