I would think that any honda dealer should have something for you. Since you are on the road. All you would need is a similar length.
But until then watch your speedo.
If you have a 78 with 18 inch rim then I think 5200 rpms equals 60mph in fifth gear.
If 16 inch rim 5500 rpms equals 60mph.
So if you want to go 70mph then 6500 rpms will do on the 16 inch rim.
But until then watch your speedo.
If you have a 78 with 18 inch rim then I think 5200 rpms equals 60mph in fifth gear.
If 16 inch rim 5500 rpms equals 60mph.
So if you want to go 70mph then 6500 rpms will do on the 16 inch rim.
