As long as your spare doesn't completely obstruct your rearview mirror's field of view you're good to go. But honestly, driving w/o at least a sideview mirror on the driver's side is dangerous. Do yourself and everyone else on the road a favor and pick up a relocation kit or get a harley mirror to put in your door hinge.
2012 Black JKUR. 15" wheels/33"tires, Hurricane Flat fenders, Trailforce HD rear bumper, Spiderwebshades on top and on Rancho tube doors, RR aluminum hood catches, QT tonneau cover, Mopar hood lock, Bestop underseat lock box