Renting a road bike in Tuscany/Toscana in Florence/Firenze or Siena

[BiggMakk]

I'd like to rent a decent road bike while I'm in Tuscany during the last week of September 2009. I'm staying equidistant from Florence and Siena.

I had originally planned on bringing my bike from New York but the hassles aren't worth it for a week. I do plan on taking my pedals and seat.

Since this forum is an international one, I hope I can get a few recommendations on rental shops.

Thanks,