Historically (the last 5 yrs), the VX has been allowed to run the easier trails (3,3+) with the temp spare wihout issue. On 4 and above rated trails it would not be advised unless enough of your buddies had full sized spares they could loan you if needed. With decent tires (not old and rotted - Larry) you wil be fine and I can only think of a few VX flats over the years.
