The No Brakes crew has done it a few times. Shouldn't be a big deal keeping up on the ride in. There is usually a group riding on Unicycles in. Was a guy on a Panny Farthing one year as well.
No chance of Keeping up with Mayor Wood on the way back if thats what you are talking about LOL. The Bike Cobb crew usually comes back via Northside dr back roads in that area then over to Columns drive once they clear 285. Gets pretty hilly.
If you are starting in Roswell its a bit hilly till you get down to Glendridge area. Decatur ride in is pretty flat.