Although the list of wheels supported for the PC version of Forza Horizon 3 is not yet finalised, the discussion on the game's forum states that it will not only be the the Xbox branded ones that are compatible with Playground's open-world racer.
The discussion is being backed up by Microsoft's own web site where we find that force feedback will be supported for the following steering wheels:
• Logitech
• G25
• G27
• G29
• G920
• MOMO Force Feedback Racing Wheel
• Thrustmaster
• T300RS
• T500RS
• RGT Force Feedback
• T150
• TX
• TMX
• Fanatec
• CSR
• HID-mode for the Xbox One
Forza Horizon 3 will be released for PC and Xbox One September 27, and we'll keep you updated about other wheels that might get support.