Glad to hear that you have things sorted out.
I would NOT recommend cycling with a puppy....and a puppy with HD should not be doing any forced running.
A puppy with good hips should not be doing any forced running till 18 months of age...because the growth plates have still not closed.
Cycling usually means running on pavement, and that is terrible for a dog with HD.
Swimming is great for a dog with bad hips, or for any dog. He needs shorter walks that are more frequent...no long hikes.
Let him run and play free in a fenced yard...but do not leash him and force him to bike or run with you.
Did the vet tell you to get him on glucosamine/chondroitin? This is what is recommended for dogs with HD.
Gina