I wheeled alot with an undersized spare. But, it is definately out of the question with any new traction control system, as the binding just multiplys.

Also depends on the wheeling. For the long, Sierra Challenge you are planning to attend a full size spare makes far more sense due to likely hood of tire failure.

Also, if you wheel the Sierras alot, buy that free replacement warranty as it will pay dividends!

1996 SR From the Area 51 Skunk Works. 37"BFG Tires, 5" lift, Rock Track 4:1 Case, Tom Woods Drive Shafts, Oasis Air, Front ARB, lifted gas tank, T-max winch and lots of stuff that cost too much.