Oh... I guess I didn't post here. Everything is bolted up and it rotates nice and smoothly, with no binding whatsoever. I have to rebuild a caliper and make a brake pedal, but the hard part is done.
View attachment 212119
View attachment 212120
There's plenty of clearance on the sides of the tire to the swingarm, and I'm really happy with how everything fit together and works.
Stock tire is a 130/90/16, and is 25.2 inches in diameter.
The 78 CX had a 18" rim with a 4.00x18 tire, for a diameter of 26 inches.
The 78 rim with a 110/90/18 on it is 25.8".
The 78 rim with a 120/90/18 on it is 26.5".
I'm running a 5.10x17 (stock size for the GL1000 rear), and I've measured it at 25.9" in diameter (well, I measured the circumference at 81.5" and calculated the diameter)
The Goldwing rim with a 130/80/17 it will have a 25.2" diameter, same as the stock 16 incher.
In truth, I was kinda hoping for more wheel-based RPM reduction. But I'll take it.