BikerBoy from Maryville, IL on 6/12/2020 10:38:29 AM:
The surface is crushed limestone, but very packed. It's actually smoother than a road that has recently been oil-and-chipped. However, you are pedaling the entire time (hardly any coasting) and therefore you want to be comfortable. Personally, I use a Giant hybrid bike with a standard seat (saddle) and 700x38C Schwalbe Marathon Plus tires. And I have thorn-resistant tubes. I HATE getting flats! Padded bike shorts make a big difference because the Katy is more about endurance than speed. I agree with the others that slower is more enjoyable on the Katy.