Two engines, two minimum weights
The 2026 FIM Motocross Technical Regulations set the MXGP minimum at 98kg for two-stroke motorcycles from 175cc up to 250cc and 99kg for four-strokes from 290cc up to 450cc. The rider is not included, but all operational fluids are.
Fuel is controlled before the race
When a motorcycle is weighed before a race, its fuel tank may contain no more than 0.5 litres. This prevents a large fuel load from masking an underweight motorcycle at the technical check. The pre-race limits are absolute and carry no tolerance.
Post-race checks recognise changing conditions
The verified motorcycle must not fall below its required minimum at any time. During or after the race, however, the FIM accepts a one-percent tolerance to account for variable test conditions. The scale used must read in steps of no more than 100 grams.
Ballast cannot be the easy answer
A team may not bolt on a component whose primary purpose is simply to add weight. The rules define that as forbidden ballast. Normal components must be firmly fixed to the machine, so making weight has to remain part of the motorcycle’s genuine technical package.
What scrutineers are actually protecting
Minimum weight is therefore more than a headline number. Capacity, engine type, fuel state, timing of the check and the function of every added component all matter. Euro MX Community’s explanation follows the official 2026 FIM wording and does not infer a team’s compliance from published specification sheets.
Facts are frozen to the verification date shown above. Any later correction will be added visibly.
Primary source checked internally: FIM 2026 Motocross Technical Regulations, articles 01.19 and 01.19.02.
