Home » Blog » How Defective Motorcycle Parts Can Cause Serious Accidents in California
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Last Modified on Sep 08, 2026
Something felt wrong the second before you went down. Maybe the front brake didn’t grab like it should have. Maybe the bike wobbled out of a turn for no reason you could explain, or the throttle stuck open a half second too long. Now you’re staring at a police report that says driver error, and a body that says otherwise.
Not every motorcycle crash in California starts with a distracted driver. Sometimes the machine fails first. A cracked frame weld, a brake line routed too close to a hot component, a tire that never should have left the factory, and a rider pays for someone else’s mistake.
Bentley & More LLP has spent years untangling exactly this kind of crash, the ones where the wreckage tells a different story than the initial report. If a part failed under you, that story is worth telling.
What Makes a Motorcycle Part Defective Under California Law
A part counts as defective if it was unreasonably dangerous when it left the manufacturer’s hands, whether the problem came from how it was designed, how it was built, or a warning nobody included.
California adopted this rule in Greenman v. Yuba Power Products, and the practical effect is significant: you don’t have to prove the manufacturer was careless. You only have to show the caliper, the tire compound, or the triple clamp was more dangerous than a rider would reasonably expect, and that the defect existed before it reached you. Design defects, manufacturing defects, and failure-to-warn claims all fall under this same doctrine, and one crash can involve more than one theory.
Some Parts Often Behind a California Motorcycle Crash
In motorcycle product liability litigation, three core systems regularly emerge as focal points during case reviews:
- Brakes and steering. Line routing failures, caliper seizure, ABS glitches, and fractured triple clamps that let the front end fold or the bike lose stopping power in an instant.
- Tread separation, sidewall contamination, and traction failures that turn a routine lean into a slide.
- Throttle and electronics. Stuck cables and control-unit glitches that deliver power the rider never asked for.
Recent Recalls Show This Isn’t Rare
In April 2026, Harley-Davidson recalled nearly 17,000 Softail motorcycles after a rear brake line wore through against an electrical module, and months earlier, in September 2025, the company pulled Sportster S models over triple clamps that could fracture. Dunlop recalled motorcycle tires in that same year, 2025, for sidewall contamination that cut traction. These weren’t hypothetical risks. Bikes with these exact defects were already on the road.
Who Pays When a Part Fails
Liability rarely lands on one company alone. Figuring out who pays starts with tracing the part back through everyone who touched it.
The Manufacturer’s Liability
The company that designed or built the failed component sits at the center of most claims, and that includes the motorcycle maker, the parts supplier, or both if an aftermarket brake kit played a role.
When a Dealer or Mechanic Shares Blame
A shop that installed a part wrong, torqued a wheel incorrectly, or missed an open recall can carry its own liability alongside the manufacturer’s, and a defective motorcycle parts attorney will often name both in the same suit.
The Clock Starts the Moment You’re Hurt
You generally have two years from the crash to file suit under California’s civil procedure code, and the deadline doesn’t pause while you negotiate with an adjuster. Filing usually happens in Orange County Superior Court or wherever the crash occurred, and missing the window can end a strong case before it starts.
Evidence disappears fast too, since bikes get repaired, sold, or scrapped before anyone thinks to preserve the failed part, check its VIN against open recalls, or run it past an expert. Securing the bike within days matters more here than in most injury cases, because the physical evidence is the case.
Frequently Asked Questions
Q: Can I still file a claim if I wasn’t wearing a helmet?
A: Yes, though comparative fault can reduce what you collect if it made your injuries worse. A jury weighs that against total damages, not against whether you can sue. Bring it up with your attorney early.
Q: What if my motorcycle was recalled before my crash?
A: A live recall on your exact part is strong evidence the defect was already known. NHTSA keeps every open recall searchable by VIN, which can shortcut the proof you’d otherwise need to build. Pull your recall history before calling an adjuster.
Q: Can I still sue if I’d modified the motorcycle myself?
A: You can, as long as the failed part wasn’t the one you changed and the modification didn’t cause the failure. Manufacturers often argue aftermarket changes cut off their liability. Keep records of what you modified and when.
Q: What if a dealer’s mechanic serviced the part before it failed?
A: Then the shop may share liability for a bad install or a missed recall notice. Service records showing who touched the part and when become central evidence. Request your full service history soon.
Q: Do I need to keep the wrecked motorcycle?
A: Yes, since the part itself is the evidence here. Once a bike is repaired, sold, or scrapped, no expert can inspect the failed component. Store it securely and don’t let an insurer take possession first.
Bentley & More LLP: Your California Motorcycle Accident Law Firm
Something about your crash didn’t add up, and that instinct is usually right. A brake that grabs unevenly, a tire that lets go on a clean line, a frame that cracked at highway speed, these things get investigated before an insurer can make them disappear.
Bentley & More LLP has spent years pulling apart exactly this kind of case for riders across Orange County, tracing a defect back to the company that built it. If your bike failed before you did, we want to see what’s left of it. Contact our firm today for a free consultation.
About the author: Greg Bentley
Co-Founder & Trial Lawyer at Bentley & More LLP
Greg Bentley is Co-Founder of Bentley & More LLP in Newport Beach, California. With 36 years of experience, he represents plaintiffs in personal injury, wrongful death, product liability, insurance bad faith, dangerous road and property conditions, and construction-site failure cases. Admitted to the State Bar of California, Greg earned his J.D. from Western State University College of Law in 1990. He is a member of several invitation-only trial organizations, including the American College of Trial Lawyers and the International Academy of Trial Lawyers, and is active in multiple statewide and regional trial lawyer associations.
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