serious yall, bicycling is not only a great workout for the muscles in your legs, core, grip/forearm grip, cardiovascular..etc. but it's also great for recovery.. I not saying that bicycling could completely take over running recovery days, because those days are still vital but maybe if you're running basically every single day or almost maybe for one of your easy days you could integrate a good cycling session in place or on top of your other run (but that run split in half)..
even on your easy days you still pound your legs more than you would cycling, if you cycle there's no pounding for that day at all so your legs can heal even more but the cycling is way better than just sittin/layin around because it gets the blood moving so much in your legs so your legs heal way faster than if you were doin just a recovery run..
i wouldn't say you have to do anything too crazy idk i guess it depends on how much cycling experience you have, around 15-20 miles would be a good start.