Yes, it’s possible to have a cycling tour in Iran. As the above ABC group cannot travel to Iran individually and they should book a tour accompanied by a guide and according to their travel itinerary they can travel to Iran for cycling. For more information, please check this link https://www.adventureiran.com/about-iran/iran-travel-visa/american-british-canadian/
Note: Getting a visa for American cyclists is the hardest among the mentioned three. They have some restrictions for traveling in remote areas or mountains. Their travel itinerary should consist of cycling through cities or urban destinations. If you have any questions or inquiries, please don’t hesitate to contact us.