--- title: "Bike Parts That Can Cause a Crash If Defective" description: "Modern bikes have 50+ components. Here's the full list of parts that can cause a rider to lose control if defective or improperly assembled." lang: en json-ld: | [ { "@context": "https://schema.org", "@type": "LegalService", "@id": "https://bikebrainlaw.com/#organization", "name": "Colorado Brain Injury & Bike Crash Attorneys | Bike Brain Law", "description": "Colorado brain injury and cycling accident attorneys serving Denver, Boulder, Fort Collins and statewide. Specialized TBI representation. Free consultation. Call 303.831.1116.", "url": "https://bikebrainlaw.com", "image": "https://bikebrainlaw.com/og-image.png" }, { "@context": "https://schema.org", "@type": "BlogPosting", "@id": "https://bikebrainlaw.com/blog/bike-parts-that-can-cause-a-crash#blogposting", "isPartOf": { "@type": "Blog", "@id": "https://bikebrainlaw.com/blog#blog", "name": "Bike Brain Law Blog" }, "mainEntityOfPage": { "@type": "WebPage", "@id": "https://bikebrainlaw.com/blog/bike-parts-that-can-cause-a-crash" }, "url": "https://bikebrainlaw.com/blog/bike-parts-that-can-cause-a-crash", "headline": "What Bicycle Parts Can Cause a Crash If Defective or Improperly Installed?", "name": "What Bicycle Parts Can Cause a Crash If Defective or Improperly Installed?", "description": "Modern bikes have 50+ components. Here's the full list of parts that can cause a rider to lose control if defective or improperly assembled.", "image": { "@type": "ImageObject", "@id": "https://bikebrainlaw.com/blog/bike-parts-that-can-cause-a-crash#primaryimage", "url": "https://bikebrainlaw.com/images/content/bike-part-words.png", "contentUrl": "https://bikebrainlaw.com/images/content/bike-part-words.png", "caption": "Diagram of bicycle parts and components", "description": "Diagram of bicycle parts and components", "representativeOfPage": true }, "primaryImageOfPage": { "@type": "ImageObject", "@id": "https://bikebrainlaw.com/blog/bike-parts-that-can-cause-a-crash#primaryimage", "url": "https://bikebrainlaw.com/images/content/bike-part-words.png", "contentUrl": "https://bikebrainlaw.com/images/content/bike-part-words.png", "caption": "Diagram of bicycle parts and components", "description": "Diagram of bicycle parts and components", "representativeOfPage": true }, "thumbnailUrl": "https://bikebrainlaw.com/images/content/bike-part-words.png", "datePublished": "2026-01-13T15:00:00.000Z", "dateModified": "2026-01-13T15:00:00.000Z", "inLanguage": "en-US", "articleSection": "Bike Injury", "keywords": "Bike Injury, Safety, Colorado, personal injury, TBI, cycling accident", "timeRequired": "PT1M", "articleBody": "Not all injuries from a bicycle crash are caused by being hit by a motor vehicle. A defect or the improper assembly of bicycle parts or components may cause a bicycle crash and serious bodily injuries or death. The number of parts assembled on a bicycle varies but can easily exceed 50 or more. Many of these parts are small and problems from defect or improper assembly are not easily detectible to the naked eye or the untrained bicycle rider. To learn more about whether a defect or improper assembly may be the cause of a bicycle crash see our articled titled How to Know if a Defect Caused a Bicycle Crash. Bicycle parts that are defective or not properly installed and can cause part failure include but are not limited to the: Axle Bolts Bottom Bracket Brakes Brake levers Brake pads Cables Cassette Chain Chainring Crank arms Expander plug Fork Frame Front derailleur Front derailleur hanger Handlebar Hoods Hubs Hydraulic fluid Pedals Quick release skewer Rear derailleur Rear derailleur hanger Rims Rotors Saddle Seat Seatpost Seatpost clamp Seatpost collar Shifter levers Spindle Spokes Sprocket Stem Stem top cap Tires Tubes Wheels These parts must be free from defect and installed correctly for safe bicycle operation. If defective or installed incorrectly, the component is likely to not work as designed and could lead to failure and cause the bicyclist to lose control, fall, crash, and suffer serious injury or death. Knowing bike parts and how to properly assemble a bike matters for winning bicycle product defect and negligent assembly cases. Attorney Dan D'Angelo is an avid cyclist, works on and assembles his own bicycles, and has litigated improper bicycle assembly against a national sports retail store with over 700 stores across the United States.", "commentCount": 0, "additionalProperty": [ { "@type": "PropertyValue", "name": "readingTime", "value": "1 min read", "unitText": "minutes", "unitCode": "MIN" }, { "@type": "PropertyValue", "name": "wordCount", "unitText": "words" }, { "@type": "PropertyValue", "name": "characterCount", "value": 1776, "unitText": "characters" }, { "@type": "PropertyValue", "name": "headingCount", "value": 0 }, { "@type": "PropertyValue", "name": "paragraphCount", "value": 49 }, { "@type": "PropertyValue", "name": "listCount", "value": 1 } ], "author": { "@type": "Person", "@id": "https://bikebrainlaw.com/#dan-dangelo", "name": "Attorney Dan D'Angelo", "jobTitle": "Trial Lawyer · Brain Injury Advocate · Avid Cyclist", "description": "Attorney Dan D'Angelo founded D'Angelo Law Office, P.C. in 2009 and Bike Brain Law to focus exclusively on traumatic brain injury and cycling injury cases in Colorado. An avid cyclist himself, Dan combines deep TBI science knowledge with hands-on cycling experience to build winning cases against insurance companies and corporations that put profits over safety.", "image": { "@type": "ImageObject", "url": "https://bikebrainlaw.com/images/content/20231015_dangelo_dan_square_076.jpg", "contentUrl": "https://bikebrainlaw.com/images/content/20231015_dangelo_dan_square_076.jpg", "caption": "Attorney Dan D'Angelo" }, "url": "https://bikebrainlaw.com/#about", "worksFor": { "@id": "https://bikebrainlaw.com/#organization" } }, "publisher": { "@id": "https://bikebrainlaw.com/#organization" } }, { "@context": "https://schema.org", "@type": "BreadcrumbList", "itemListElement": [ { "@type": "ListItem", "position": 1, "name": "Home", "item": "https://bikebrainlaw.com" }, { "@type": "ListItem", "position": 2, "name": "Blog", "item": "https://bikebrainlaw.com/blog" }, { "@type": "ListItem", "position": 3, "name": "What Bicycle Parts Can Cause a Crash If Defective or Imprope", "item": "https://bikebrainlaw.com/blog/bike-parts-that-can-cause-a-crash" } ] } ] --- [![Bike Brain Law](/assets/logo-white-CuISKEAM.webp)](/)[303.831.1116](tel:3038311116) Practice Areas Practice Areas - [Brain Injury Focused brain injury representation backed by science, trial experience, and real results. ](/practice-areas/traumatic-brain-injury) - [Cycling Accidents An avid cyclist who fights for injured riders across Colorado. ](/practice-areas/cycling-accidents) - [Bicycle Product Liability Holding manufacturers accountable when defective bike parts cause injuries. ](/practice-areas/bicycle-product-liability) Resources - [Insights & Guides ](/blog) - [Case Results ](/results) - Our Process - FAQs Service Areas - [Denver](/service-areas/denver) - [Boulder](/service-areas/boulder) - [Fort Collins](/service-areas/fort-collins) - [Golden](/service-areas/golden) - [Colorado Springs](/service-areas/colorado-springs) - [Aurora](/service-areas/aurora) Featured [ ![Attorney Dan D'Angelo](/assets/dan-dangelo-headshot-DJ4GY3yR.jpg) Meet Attorney Dan D'Angelo Trial lawyer, trusted brain injury advocate, avid cyclist. Learn more ](/) Free consultation · No fee unless we win. Talk to Dan AboutTestimonials[Results](/results)FAQsContact[Insights & Guides](/blog)Free Consultation [](tel:3038311116) [All articles](/blog) [Bike Injury](/blog/bike-injury)[Safety](/blog/safety)· January 13, 2026· 1 min read # What Bicycle Parts Can Cause a Crash If Defective or Improperly Installed? Modern bikes have 50+ components. Here's the full list of parts that can cause a rider to lose control if defective or improperly assembled. ![Dan D'Angelo](/images/content/20231015_dangelo_dan_square_076.jpg) By Attorney Dan D'Angelo Trial Lawyer · Brain Injury Advocate · Avid Cyclist ![Diagram of bicycle parts and components](/images/content/bike-part-words.png) Not all injuries from a bicycle crash are caused by being hit by a motor vehicle. A defect or the improper assembly of bicycle parts or components may cause a bicycle crash and serious bodily injuries or death. The number of parts assembled on a bicycle varies but can easily exceed 50 or more. Many of these parts are small and problems from defect or improper assembly are not easily detectible to the naked eye or the untrained bicycle rider. To learn more about whether a defect or improper assembly may be the cause of a bicycle crash see our articled titled [_**How to Know if a Defect Caused a Bicycle Crash**_](https://www.bikebrainlaw.com/blog/how-to-know-if-defect-caused-bicycle-crash). Related from Bike Brain Law - [Cycling Accident Claims Representing Colorado cyclists hit by negligent drivers. ](/#practice-areas) - [Bike Crash FAQs Common questions after a cycling collision in Colorado. ](/#faqs) - [Why Choose Bike Brain Law An attorney who rides and knows TBI science. ](/#about) Free, confidential case review ### Injured in a cycling crash in Colorado? Talk directly with Attorney Dan D'Angelo for a free consultation with zero obligation to find out where you stand. [Get My Free Consultation](/#contact) [303.831.1116](tel:3038311116) Bicycle parts that are defective or not properly installed and can cause part failure include but are not limited to the: - Axle - Bolts - Bottom Bracket - Brakes - Brake levers - Brake pads - Cables - Cassette - Chain - Chainring - Crank arms - Expander plug - Fork - Frame - Front derailleur - Front derailleur hanger - Handlebar - Hoods - Hubs - Hydraulic fluid - Pedals - Quick release skewer - Rear derailleur - Rear derailleur hanger - Rims - Rotors - Saddle - Seat - Seatpost - Seatpost clamp - Seatpost collar - Shifter levers - Spindle - Spokes - Sprocket - Stem - Stem top cap - Tires - Tubes - Wheels These parts must be free from defect and installed correctly for safe bicycle operation. If defective or installed incorrectly, the component is likely to not work as designed and could lead to failure and cause the bicyclist to lose control, fall, crash, and suffer serious injury or death. Knowing bike parts and how to properly assemble a bike matters for winning bicycle product defect and negligent assembly cases. Attorney Dan D'Angelo is an avid cyclist, works on and assembles his own bicycles, and has litigated improper bicycle assembly against a national sports retail store with over 700 stores across the United States. ## Have a question about your case? Attorney Dan D'Angelo offers free consultations for brain injury and cycling accident victims throughout Colorado. [Free Consultation](/#contact) [303.831.1116](tel:3038311116) ![Dan D'Angelo](/images/content/20231015_dangelo_dan_square_076.jpg) About the Author ### Attorney Dan D'Angelo Trial Lawyer · Brain Injury Advocate · Avid Cyclist Attorney Dan D'Angelo founded D'Angelo Law Office, P.C. in 2009 and Bike Brain Law to focus exclusively on traumatic brain injury and cycling injury cases in Colorado. An avid cyclist himself, Dan combines deep TBI science knowledge with hands-on cycling experience to build winning cases against insurance companies and corporations that put profits over safety. - Practicing Colorado personal injury attorney since 2009 - Focused practice in TBI and bicycle injury litigation - Multi-million dollar settlements and verdicts for injury victims - Avid road and commuter cyclist ## Related articles [ ![Attorney Dan D'Angelo of Bike Brain Law](/images/content/20231015_dangelo_dan_039.jpg) #### How Much Does a Denver Bike Accident Lawyer Charge on Contingency? ](/blog/how-much-does-a-denver-bike-accident-lawyer-charge-contingency)[ ![Dan D'Angelo of Bike Brain Law on his bike in Denver](/images/content/dan-on-spyder-bike.jpg) #### Can a Denver Bike Accident Attorney Negotiate With Insurers and Take My Case to Trial? ](/blog/denver-bike-accident-attorney-negotiate-insurers-trial)[ ![Cyclist riding in a designated bike lane in Denver](/images/content/img_1005.jpg) #### How Does Colorado's Comparative Negligence Rule Affect a Bicycle Accident Claim? ](/blog/colorado-comparative-negligence-bicycle-accident-claims) [![Bike Brain Law](/assets/logo-white-CuISKEAM.webp)](/) Colorado's dedicated brain injury and cycling accident attorney. 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