Hey Lonesome,
Measure the diameter of the rim to be sure it's a 10", then measure across the bolt circle(center to center across diagonally, if you can go outside of one hole to inside of the other and that will give you the Center to center in inches), then take your dimension and either divide it by 0.0393700787402 or multiply it by 25.4 and you will get the bolt circle. From there you could probably be able to go to find an atv rim website that you can search by bolt pattern and deduct from there which type of atv it came from or what it will fit. Sorry about the 0.0393700787402, I think its a cruel joke Engineers play on younger aspiring enginers, I have it beaten into my brain to convert from inches to mm
EX: 5-5/16 = 5.312
5.312/0.0393700=134.925mm(135) or 5.312 X 25.4=134.925mm(135)
I know it's more leg work but atleast it would be exact on what it fits rather than assuming, you ask 5 guys to look at it and you might get 5 different answers. Hope this all helps. Oh yeah, I don't know what it fits.
Racerxxx
1985 Honda 125M (My first Trike--Still have it)
1986 Honda 250SX
1981 Honda 110
1982 Honda 110
1986 Yamaha YFM80 (Sons quad)
Past rides: 1983, 1984 200X, 3--1985 Kawasaki T-3
1987 CR-80, 70's vintage XR75, RM 370