We've got a couple of very nice bike with skinny tires here on consignment.
First off, a 2006 or so Schwinn Fastback. Medium, 51.5 c-t seat tube and about a 54cm effective top tube. Aluminum frame and fork with 8sp Shimano Tiagra triple. Looking for $300 on this one. This Fastback would be a great starter bike for a smaller person. It has barely been ridden and is in great shape.
Next up is a 2007 Specialized S-Works cross bike. 54.5cm aluminum frame with carbon fork. It's build is very nice - SRAM Rival group, Thomson post, Ritchey WCS stem, Salsa Bell Lap Bars. This bike is super clean. $1300.