Triumph · 2004 to 2017
Triumph Rocket III darkside tire sizes
Stock rear on the Triumph Rocket III (2004 to 2017) is 240/50R16. Riders report running 245/50R16, 225/60R16, 225/55R16 and others as a car tire on the rear.
Stock front150/80R17
Stock rear240/50R16
What riders report
Rear · car tire245/50R16
Federal 595Recommended by a longtime darksider. He says 245 is the widest that fits between the swingarm.
Rear · car tire225/55R16
Cooper CS4Over 1,000 miles, good in wet and dry.
Rear · car tire245/55R16Caution
Avoid: Toyo Proxes T1ROne rider warns the T1R's sidewall is too soft for this bike.
Car sizes close to stock, on paper
These car tire sizes come within 3 percent of the stock 240/50R16 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.