These are the ones from the official server.
sync_radius 500
sync_min_interval 250
sync_full_interval 30
The full interval is set to 30ms because while 25ms causes slightly smoother sync, it also uses quite a lot more bandwidth.
These settings should only really be changed if you have a lot of BW to spare and want slightly smoother sync, your running a LAN server, or your running a low bandwidth server so you want to squeeze more slots out of it.