I ran a 120 80 16 on my ‘76CH. I had short shocks and the 130 interfered at the sides. The 120 was just the right size to avoid problems while riding 2up. It was a Challenger by Kenda and I went through 3 on the CH before I sold it. (24 yrs).Great tire. I have the 130 size on a rim for my KHK chop project.
Slight increase in cruising RPM due to smaller profile but not enough to bother me running a 22 tooth front sprocket,
A pic for reference…