the big advantage to the 13/49 is its easy to change the front to a 15 for the road and back to the 13 for off road
with a 15/49 it sings a bit at 55mph but is ok.
i like the 15/46 for road use
2000 DRZ400e tagged
1980 TS125 project in the corner
2005 zuma 50/70 the wifes bike