Road Journey is the best part of visiting Ladakh. However, bike trips are very common and popular around ladakh, you can easily hire bike and go on a trip from Manali or from J&K both sides.
Ladakh is accessible via both Road and Airways. Airlines such as Indian Airlines and Jet Airways are flying from Delhi to Leh directly.
In other options - Road is accessible from both J&K and Manali, you may plan road trip from any of the destination.