Suzuki · 2006 and later
Suzuki Boulevard M109R darkside tire sizes
Stock rear on the Suzuki Boulevard M109R (2006 and later) is 240/40R18. This bike has a darkside following, but I haven't collected rider reports I'd trust yet.
Stock front130/70R18
Stock rear240/40R18
No rider reports yet. If you run a car tire on a Suzuki Boulevard M109R, tell me what fits.
Car sizes close to stock, on paper
These car tire sizes come within 3 percent of the stock 240/40R18 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.
Before you buy
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.