Sore quads question

I recently bought a new used bike that has a 53/39 172.5mm crank. My old bike had 50/34 170mm. I had my new bike professional fit at LBS. I did a 60 mile ride today at the same pace (19.5mph) I normally do. Now my quads are really sore compared to the old set up. I do plan on getting a new compact...