Emily, I think you might find that a 25 on the rear is not so standard anymore. I've gone from a 25 to 27, then a 28 on my triple. My other bike has a compact, with a 34 small ring and an 11-34 on the back. It's a mountain rear derailleur, but it's already 3 years old and there's newer technology. My friend just got a Trek Project One bike with a road derailleur and a compact set up that has a 32 on the back. As we all age, there's just a bigger demand for these types of set ups.