I started with 32s on my Aurora, switched to 28s and loved the difference in the amount of effort that it took to pedal. I didn't really notice much at first until I had a problem with a 28 and put one of the 32s on and it felt like I was struggling to pedal. I got a fixed gear bike with 25s on it. It felt even better. Then got my roadie bike with 23s... Now I hate fat tires. Unless it's the beer..