Well, just in case anyone else needs this info I thought I'd save you all some money for phone calls. Out of the 14 shops I called, 2 rent road bikes (as opposed to mountain or hybrid/comfort). They're supposed to get back to me on whether they have anything in my size.
Here are the shops:
Tahoe Sports Ltd.
4008 Lake Tahoe Blvd.
South Lake Tahoe, CA 96150
530-542-4000
Olympic Bike Shop
620 North Lake Tahoe
Tahoe City, CA
530-581-2500



but I'd like to get something halfway decent. Preferably a place that rents both road and mountain bikes, as my hubby will want a mountain bike. Unfortunately, we don't have a way to get our bikes up there, unless we ride all the way! 
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