Kumho Ecsta MX, only make a 205 - 15
http://www.tirerack.com/tires/Sizes....model=Ecsta+MX
BFG TA KD start at 17" rim size:
http://www.tirerack.com/tires/Sizes....e+T%2FA+KD
Bridgestone Potenza 195 15 only:
http://www.tirerack.com/tires/Sizes....Potenza+RE-01R
Hancook make a 225 15
http://www.tirerack.com/tires/Sizes....el=Ventus+R-S2
I'm not finding any good 15" tires on tire rack, - unless you want to run a 225 tire.
David