Welcome to the Dark Side? Are Car Tires Safe to Use on Your Motorcycle?

The term “the Dark Side” in motorcycling refers to when a rider mounts a car tire on the rear wheel of a motorcycle. It started in online motorcycle forums (especially among touring and cruiser riders) where riders who experimented with car tires were often criticized. Using a car tire on a motorcycle is unconventional and controversial, so those who did it jokingly called themselves part of the “Dark Side” — as if they were rebels or outsiders going against the norm. It plays on the Star Wars reference: leaving the accepted “light side” of standard motorcycle tires and crossing into the “dark side” of nontraditional tire use.

The Dark Side

Why Riders Do It?

• Longevity: Car tires generally last much longer than motorcycle tires.

• Cost: They’re usually cheaper for the mileage you get.

• Load capacity: Some touring riders (especially Gold Wing and big cruiser owners) like car tires for long-distance two-up riding because of the heavier weight rating.

Motorcycle Tire vs Car Tire

Why It’s Controversial

• Tire profile: Motorcycle tires are rounded for leaning into turns; car tires are flat, so handling in corners can feel awkward or unpredictable.

• Fitment: Car tires aren’t designed for motorcycle rims, so seating and bead sealing can be an issue.

• Liability: Tire and bike manufacturers don’t recommend it, so it’s considered “unsafe” by many in the industry.

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