How Roller Derby Works:
Derby 101 in 60 Seconds
Flat-track roller derby is full-contact strategy on eight wheels. There is no ball, puck, or separate offense and defense: both teams attack and defend at the same time.
The Anatomy of a 2-Minute Jam
Click through the five steps, or select Auto-Play, to follow a sample jam from the opening whistle to a call-off.
Roller Derby Track Simulator
Step through a typical 2-minute jam to see how the pack works, who scores, and how jams are called off.
The Pack & The Starting Lineup
Unlike most sports, roller derby has no ball or puck! Both teams share the track simultaneously. The 4 blockers from each team line up between the Pivot Line and the Jammer Line to form The Pack. The two Jammers (wearing the star covers) line up 30 feet behind the pack.
Key Rule Takeaway
✔Pack Definition: Largest group of in-bounds blockers skating within 10 feet of each other.
✔Skater Count: 5 skaters per team on the track (1 Jammer + 4 Blockers).
Who's Who on the Track
A team may field up to five skaters in a jam: one Jammer and up to four Blockers. One Blocker may be designated as the Pivot.
The Jammer
Helmet Cover: Star (⭐)
The only skater who can score points. Jammers begin behind the pack, then work through it with speed, footwork, and teamwork.
Mission: Lap opposing blockers to score points.
Superpower: Earning "Lead Jammer" to end the jam early.
The Pivot
Helmet Cover: Solid Stripe (▌)
The pack's on-track organizer. Pivots line up at the Pivot Line, help direct the wall and pack speed, and may receive a Star Pass.
Mission: Direct the blockers and control the tempo.
Superpower: Can take the jammer helmet cover and become the new Jammer!
The Blockers
Helmet Cover: Plain / League Helmet
The defensive anchors and path-makers. Blockers play offense and defense at the same time: forming walls to contain the opposing Jammer while creating space for their own.
Mission: Hold the opposing jammer back, plow paths for their own.
Superpower: Seamless triangular "tripod" walls and hip checks.
Timing, Jams & Scoring
How points are earned and why the clock is the most strategic weapon on the track.
Match Duration
A game has two 30-minute periods with a halftime between them.
Jam Duration
The game is divided into jams lasting up to two minutes. Teams get at least 30 seconds between jams to line up and substitute.
Per Opposing Blocker
The initial trip through the pack sets up scoring. After that, a Jammer earns one point for each opposing Blocker they legally lap.
Full Scoring Pass
Passing all four opposing Blockers on an earned scoring trip is worth four points. Only Blockers can be scored upon.
Why Do Jams End Early? (Momentum, Defense & The Hip-Tap)
A jam can end before the two-minute limit. The Lead Jammer may call it off by repeatedly tapping both hands against their hips.
Why it matters: A call-off is a tactical choice. A Lead Jammer may end a jam to protect a scoring advantage before the opposing Jammer can answer.
Contact Rules & The Penalty Box
Roller derby is full-contact, but contact is tightly regulated for fairness and safety.
Legal Target & Blocking Zones
Skaters may initiate contact only with legal blocking zones against legal target zones. Common legal zones include:
- ✔Hips & buttocks: Used for controlled positional blocking.
- ✔Torso & chest: Used for bracing and positional blocking.
- ✔Upper arms & shoulders: Legal when controlled and within the rules.
- ✔Thighs: Used to maintain position and move an opponent off a line.
Illegal Contact & Major Penalties
These actions can result in a 30-second penalty, measured in jam time:
- ✕No Elbows or Forearms: Pushing, hooking, or chicken-winging with arms.
- ✕No head, neck, or back hits: Those areas are illegal target zones.
- ✕No Tripping or Low Blocks: Sliding into legs or using skates to trip.
- ✕No Track Cuts: Going out of bounds and re-entering ahead of an opponent.
- ✕No clockwise blocking: Blocking while moving in the opposite direction is unsafe and illegal.
What is a "Power Jam"?
When one team's Jammer is serving a penalty, the other team has a Power Jam: its Jammer can keep working through the pack without an opposing Jammer scoring at the same time.
Deciphering the Whistles
A few common whistle signals help spectators follow the action:
The jam starts and the skaters are released to play.
Lead Jammer is awarded. Other whistle patterns may signal officiating instructions.
The jam is over—either called off by the Lead Jammer or ended by the clock.
Derby Lingo Cheat Sheet
Hear something yelled from the bench or announcers? Here's what they mean:
Apex Jump
A Jammer jumps over the inside track boundary around a turn and lands in bounds without touching the out-of-bounds floor.
Star Pass
A Jammer may transfer the star helmet cover to their Pivot. After a legal pass, the Pivot becomes the Jammer and continues the scoring effort.
The Goat
A strategy that isolates an opposing Blocker near the front of a wall while controlling the pack's speed. It can create space for a team's Jammer, but the pack still must remain legally defined.
No Pack!
Called when no legally defined pack exists. Blockers must reform the pack promptly and avoid illegal engagement while doing so.
Track Cut
Re-entering the track ahead of an opponent who was ahead of you after going out of bounds. A track cut can result in a 30-second penalty.
Fresh Meat
A traditional nickname for new skaters learning basic skating, safe falls, and pack dynamics. Some leagues simply say "new skater" or "rookie."
Now You're Ready to Watch Live!
See the strategy, athleticism, and teamwork up close at a Brookings Area Roller Derby event.