Yes, you can hire pushbikes (bicycles) at Le Mans during the 24 Hours of Le Mans and LeMans Classic, and there are various options for doing so, including bike rentals in the city and services that offer transport within the circuit, please check the map here for details.
Check for Specific Event Restrictions: During the 24 Hours of Le Mans, there may be additional restrictions on bike access to certain areas, so it's best to check with the organizers or local bike rental services.
Helmets: Helmets are mandatory for children under 12 using bicycles.