I've got Fulcrum Racing 5 wheels recently https://shop.sunrisecyclery.com/item/12841/
I'm having a very hard time putting tyres onto these wheels. I was not able to put my old Conti Gator Skin with wire bead on at all. Foldable Vredestein Fortezza SE were a bit easier and I managed to put them on after breaking a few plastic levers.

What's wrong? Is that wheels, tyres, or I just need to build more muscles?