Just following up on Edulis's comment - please note that men should not cycle until at least they have had their 6/8 week post-op review with the surgeon. Even then, it may be wise to delay getting back on a bike - my husband (a keen cyclist) was told by his surgeon not to cycle for 6 months - he said "what is the point of me taking care to preserve the nerves if you are not going to give yourself the best chance of nerve recovery.
I am aware that not all urologists agree that cycling too soon can prevent recovery from ED but in our case, J decided that if he ignored the surgeon's advice and was left with permanent ED he would always wonder whether it was his own fault. As a wife, I am fairly certain that if he had got on his bike before the 6 month mark, I would have been very resentful all these years since.