Note: I was told last year a good way to get around the pits was to buy a used bicycle at Goodwill in SL City and then sell it to someone at the end of Speedweek. You may even break even in price and your feet will thank you.
A bit of personal insight on that. I shipped my bike out last year via UPS, flew into SLC, and took the gambling bus to Wendover, where I had made arrangements to pick it up at a local business. And while it was perfect on groomed surfaces, such as the pit area, when I got off into the crunchies, and on the lesser groomed area between Land's End and the pits, it tended to understeer. I actually flipped once, and while I'm no worse for the wear, I'm certain it provided a degree of entertainment for someone.
A wider tired trail bike would have been a better choice - mine was an older 10 speed with narrow tires.
It's doable - just be careful.