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Roller Derby Jams are what the periods of a bout are split into.
So in a Bout you have 2 periods, each are 30 minutes long.
During the periods, you have what we call Jams, which last either 2 minutes or until the Lead Jammer ends the Jam by "calling it off".
Since not every jam is 2 minutes there is no specified number of jams in one period.
hope this helps. =)
What else can I help you with?
When was Humboldt Roller Derby created?
Humboldt Roller Derby was created in 2007.
When was Houston Roller Derby created?
Houston Roller Derby was created in 2005.
When was Helsinki Roller Derby created?
Helsinki Roller Derby was created in 2009.
When was Pacific Roller Derby created?
Pacific Roller Derby was created in 2008.
When was Wasatch Roller Derby created?
Wasatch Roller Derby was created in 2008.
When was Tucson Roller Derby created?
Tucson Roller Derby was created in 2003.
When was Junior roller derby created?
Junior roller derby was created in 2007.
When was Roller Derby Toulouse created?
Roller Derby Toulouse was created in 2010.
When was NEO Roller Derby created?
NEO Roller Derby was created in 2007.
When was Toronto Roller Derby created?
Toronto Roller Derby was created in 2006.
When was Arizona Roller Derby created?
Arizona Roller Derby was created in 2003.
When was Roller Derby - brand - created?
Roller Derby - brand - was created in 1936.
