That is a basic math question..you need to know the offset of the OEM rim and I too had a hard time finding that answer. Diameter and bolt pattern are a match..but offset???
If you have an OEM wheel measure the existing front with a tape measure to find it's offset..
Chances are this rim will fit and if the offset isn't right on you could make it up with spacers..I did this same thing with a 11" rim on the front wheel of my 250SX
Find the missing numbers for the OEM and I can help you with the math to find out how much spacer to get it centred between the forks.
Current toys..
1986 Honda 350X..trail bomb!
1985 Honda 250SX..my main mudder
1985 Honda 250ES..Back in Black Trike
Current non-trike toys:
1990 Honda TRX300FW
1995 Seadoo GTX
1998 Polaris Indy Lite 340(Nearly new looking)
1998 Polaris Touring 500
1998 Club Car (electric)