Honda Valkyrie GL1500C darkside tire sizes
Stock rear on the Honda Valkyrie GL1500C (1997 to 2003) is 180/70-16. Riders report running 205/60R16, 205/55R16, 205/65R16 and others as a car tire on the rear.
What riders report
Called the most popular size. About stock height. May need the nut cage mod.
Shorter than stock, so it may not need the nut cage mod.
Taller than stock and likely needs the nut cage mod.
A little smaller in diameter than stock.
Riders report a rear tire near the stock front size. One reports a 130/70-17 rear.
Car sizes close to stock, on paper
These car tire sizes come within 3 percent of the stock 180/70-16 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.