Honda Gold Wing GL1800 darkside tire sizes
Stock rear on the Honda Gold Wing GL1800 (2001 to 2017) is 180/60R16. Riders report running 195/55R16 as a car tire on the rear.
What riders report
This is the car tire on my own Gold Wing, run double dark with a Bridgestone BT46 up front. I bought it from SimpleTire and mounted it myself, and I've been very happy with it.
The most commonly reported choice. Some riders run 60-series or 205 widths. Stiff run-flat sidewalls are a big part of the appeal.
A rider liked it until a nail split a belt, then found it's no longer made.
Car sizes close to stock, on paper
These car tire sizes come within 3 percent of the stock 180/60R16 rear in overall height, by the math alone. They are not rider-tested. Width, rim fit and clearance on your bike still decide what actually works.
Stock sizes come from published fitment listings and owner forums. Check the size on your current tire or the label on your bike, then read the big questions and the mounting guide.