You can participate with any type of bicycle, the first to arrive will win. We recommend a Gravel, Off-Road or MTB bike with 700x33c to 700x45c cyclocross tires, since not all sections are in optimal condition. We also recommend a 1 to 1 ratio, for example 50-34 forward and 34-11 reverse. As for the equipment, we can recommend a front bag and a rear bag at least.
You can see the mandatory material in the race regulations.