Does anyone know if one can switch from one group to another? Say you are pre-registered in Group B but then decide you want to ride a Special bike and ride in Group F or maybe, you decide you want to do the 84H Monday morning. If this is possible to switch, is there a deadline? Maybe before you complete registration, enter your SR ride numbers and pay up? (I know I can do PBP on a recumbent but would like to do it once more on an upright bike, but am not feeling confident)