You could, but you may end up isolating your wireless hosts from the wired side. That may not be a bad thing if you're concerned about security.
If you use static IPs, you could set the WAN side of the wireless router to use, say 192.168.1.x (or whatever IP range your wired router uses on its LAN side), and then set the wireless DHCP to use the 192.168.2.x range.