FACT-CHECKEDWritten in-house from a primary official source. No copied article and no outbound detour.

One straight, two hard limits

The FIM circuit standard does not leave the opening run completely to chance. From the starting gate to the inside of the first turn, an MXGP start straight must measure at least 80 metres and no more than 125 metres. That fixed window is the frame for every launch, drag race and braking decision that follows.

Why the measurement ends at the inside

The rule uses the inside of the first turn as the reference point. That gives organisers and officials one consistent place from which to measure even when the corner opens out across a much wider racing line. The shape, surface and radius can still give a circuit its own character; the approach distance cannot simply be stretched without limit.

The rider problem begins before the corner

Within 80–125 metres, a rider has to turn the launch into track position. Reaction, drive and the choice of when to stop accelerating all matter before the bike reaches lean angle. A shorter approach compresses those decisions; a longer one gives the field more time to build speed, but also makes braking and line commitment more important.

A small rule with a large spectator effect

The first-turn rush looks spontaneous from the fence, yet its scale sits inside a deliberate circuit standard. The rule creates room for a meaningful start without allowing an unlimited high-speed run into the opening corner. It is one example of how track culture is shaped by technical dimensions that most spectators never see on a map.

What this explainer does not claim

The 80–125 metre window does not predict who will take the holeshot, nor does it make every first turn identical. Gradient, soil, preparation, weather and corner design still change the challenge. Euro MX Community is recording the confirmed FIM dimension and separating it from rider-specific setup or unverified circuit measurements.

Editorial note
Facts are frozen to the verification date shown above. Any later correction will be added visibly.
Primary source checked internally: FIM 2026 Motocross World Championships Regulations.