Dunlop D803 Trials Tire WILL fit, just barely
FYI you CAN put a D803 trials tire onto the 230L.
The only two gear ratios that I KNOW will work are 13/48 (106 links) and 13/51 (108 links).
13/46 won't fit
13/47 - unknown didn't have one
13/48 FITS, but the rear tire barely clears the mud flap
13/49 won't fit
13/50 won't fit
13/51 FITS, but the axle is at the very back of the swingarm slot with only 1 or 2 adjustments left for chain wear on the snail adjustors.
13/52 - unknown didn't have one
Hope this helps.