Dan, only the 'E' and 'F' SIDs use the RF (radius to fix) path terminator.
(You must be on the 777 or -8?)
If you cancel the speed, the FMS should automatically adjust the bank angle to maintain the radius. Up to a limit of course (23-25 degs from memory).
The other RNAV SIDs do rely on the speed to contain the radius.