How is the start order decided in a mountain bike race, and how is the race started?
I · Intermediate · The cross-country race · 1 of 6By ranking. Riders are called to the line in the order of the UCI cross-country ranking, with unranked riders drawn by lot behind them. The commissaire announces three, two and one minute and 30 seconds to go, then that the start will come within 15 seconds, and fires a pistol.
How it works
- The order: "As per the last published UCI XCO individual ranking", then unclassified riders by drawing lots.
- The call-up: no earlier than 20 minutes before the start. Riders line up in the order in which they are called.
- Rows: the president of the commissaires' panel decides how many riders stand on each line.
- Choosing a place: "The rider himself decides which position on the line to take."
- No warming up on the grid: once riders are lined up, rollers and trainers are not allowed.
- The warnings: three minutes, two minutes, one minute and 30 seconds before the start.
- The last call: an announcement that the start will be given within the next 15 seconds.
- The signal: a starting pistol or start lights. If there is neither, a whistle.
- The start zone: at least 6 metres wide for 50 metres before the line and 100 metres after it, and 8 metres wide at world championships and World Cups.
- Flat or uphill: the start must never be downhill.
The glossary has cross-country and the singletrack.
Tricky cases
Does the best-ranked rider have to stand in the middle of the front row?
No. Each rider chooses their own position on the line when called.
Is the start given exactly on zero?
No. After the 30-second warning the commissaire announces that the start will come within the next 15 seconds, and it may come at any moment in that time.
Can a rider keep warm on a trainer beside the grid?
No. Once the riders are lined up, warm-up on rollers or a trainer is excluded inside or outside the start area.
Is the grid at a World Cup set by the same ranking?
It depends on the World Cup's own rules, which were not read in full. The general rule on these pages excludes world championships and World Cup events.
Why the rule exists
On a course that soon narrows to one bike's width, the first hundred metres decide who gets through cleanly. Gridding by ranking puts the fastest riders where they are least likely to be held up or to cause a pile-up, and a start within a 15-second window stops anyone timing a flying start.
Where it differs
| Where | What changes | Source |
|---|---|---|
| Most cross-country events | Grid by the UCI cross-country ranking, then lots | UCI 4.2.061 |
| Marathon | Marathon ranking first, then the cross-country ranking, then lots | UCI 4.2.061 |
| Eliminator heats | Riders choose a place on one line in order of race number | UCI 4.2.013 |
| World championships and World Cup | Their own grid rules, not read | UCI 4.2.061 |
From the rule book
Union Cycliste Internationale, Cycling Regulations, Part 4: Mountain Bike Races (JCF edition 2025, amendments applying 1 January 2026), articles 4.1.030, 4.1.031, 4.2.031 and 4.2.061. Checked 14 October 2026. Official document: UCI Cycling Regulations, Part 4 (PDF).