Broken Bike Bits

See also also bike pic for other bike-related technical discussions and more failed parts.

Axles

First page -- Aluminum axle fails at bearing shoulder.

Bottom Brackets

First page -- Isis failure, nearly-new, touring cyclist.
Second page -- Viscount notched spindle failure.
Third page -- Campagnolo Ultra-Torque bearing failure.
Fourth page — steel BMX crank spindle failure at arm

Brake

First page -- Brake pad cotter/tube failure.
Second page -- SunRun noodle shoulder failure.
Third page -- Brake return spring failure.

Cable, Housing, and Stops

First page -- Failed plastic housing sheath is failed housing.
Second page -- Failed housing stop

Chainrings

First page -- Composite separation

Cranks

First page -- from the collection of Ric Hjertberg.
Second page -- welded tubular steel failure, Bullseye
Third page -- welded steel failure, Tioga Revolver
Fourth page -- split along square taper, Campagnolo
Fifth page -- non-failed Sweet Wings crank
Sixth page -- carbon crank fails parallel to chain line, Colnago
Seventh page -- vintage crank failure
Eighth page -- failure away from features, Dura-Ace
Ninth page -- Race Face arm failure away from features
Tenth page -- arm failure at pedal eye, newer Campagnolo Super Record
Eleventh page -- crack at spider/arm transition, Cannondale Coda ``Magic''
Twelfth page -- arm failure at pedal eye, older Campagnolo
Thirteenth page -- arm failure at pedal eye, older Shimano Dura-Ace, replacement with Jobst Brandt collet.
Fourteenth page -- arm failure at square taper, late 1990's Topline.
Fifteenth page -- square taper failure, Grafton Joystix
Sixteenth page -- CODA Magic hollow crank separation at glue line
Seventeenth page -- middle of arm, Campagnolo c. 2002
Eighteenth page -- hollow crank failure at end of hollow section.
Nineteenth page -- pedal eye failure despite use of pedal washer
Twentieth page -- Arm failure at square taper, Topline
Twentyfirst page -- Arm failure at end of groove, partial failure both arm/spider transitions; 1970's Campagnolo
Twenty-second page -- 1970's crank failures: T.A., Stronglight, 2x Campagnolo.
Twenty-third page -- CODA Magic hollow crank separation at glue line
Twenty-fourth page -- tubular steel crank failure at pedal eye, Bullseye
Twenty-fifth page -- two crank failures, one rider: Race Face Isis Turbine LP, Race Face Next LP
Twenty-sixth page -- crank failure, C-section arm
Twenty-seventh page -- crank failure, hollow arm
Twenty-eighth page -- crank failure, left-side square taper, away from crank
Twenty-ninth page -- crank failure, at pedal eye
Thirtieth page -- Truvative Styleo Team, near spider
Thirty-first page — failure at spider/crank transition
Thirty-second page — presumed failure at spider/crank transition
Thirty-third page — Bontrager aluminum crank failure in rounded section
Thirty-fourth page — failures of three "vintage" cranks of unknown history
Thirty-fifth page — Campagnolo "Grand Sport" failed near pedal eye

Crank Spider

First page -- Failed Sweet Wings spider

Forks

First page -- threaded steer tube fails, freeing stem
Second page -- both dropouts failed
Third page — carbon steer tube failures at aheadset stem pinch clamp
Fourth page — steer tube failure

Frames

First page -- down tube buckles at center while braking
Second page -- failure at weld
Third page -- failure in a crash
Fourth page -- failure long seatpost/short insertion
Fifth page -- seat stay failure, steel frame
Sixth page -- dropout/stay failure, steel frame
Seventh page -- dropout/stay failure, aluminum frame
Eighth page -- four dropout/stay failures, one rider, steel frames
Ninth page -- dropout failure, aluminum frame
Tenth page -- seat tube/bottom bracket failure, steel frame.
Eleventh page -- dropout failure, steel frame; seat tube/bottom bracket failure, aluminum frame.
Twelfth page -- bottom bracket seat/down tube failure, titainum frame.
Thirteenth page -- down tube failure near head tube, steel frame.
Fourteenth page -- removable derailleur hangar failure.
Fifteenth page -- head tube separation after a crash.
Sixteenth page -- swingarm separation at weld.

Handlebars

First page -- failed cast stem (recalled aerobars)
Second page — failed near stem.

Headsets

First page -- indented needle roller bearing
Second page -- salt air oxidation damages cup and frame

Hubs

First page -- flange failure, radial lacing
Second page -- flange failure, radial lacing -- Tune
Third page -- flange failure, radial lacing -- SunTour Superbe
Fourth page -- flange failure, radial and 2-cross laced Tune hubs
Fifth page -- flange failures, straight-pull spokes
Sixth page -- freehub failure, Mavic Ksyrium
Seventh page -- flange failure at bearing, Nuke-Proof
Eighth page — King ISO at dropout
Ninth page — Phil Wood ratchet ring
Tenth page — Shimano XT 775 ratchet
Eleventh page — flange failure, World Class 48H

Nipples

First page -- aluminum 2.0 nipple fracture
Second page -- aluminum 2.0 nipple fracture

Pedals

First page -- plastic pedals

Rims

First page -- Spinergy aluminum rim failure
Second page -- Mavic 517 spoke bed failure, tube bed failure
Third page -- Sun "zero degree" rim failure at spoke bed; may have been overtensioned
Fourth page -- H Plus Son "Formation Face" tube bed failure

Seat

First page -- seat rail
Second page -- broken seat "rail"
Second page -- broken seat rail

Seatpost

First page -- saddle clamp bolt failure
Second page -- telscoping seatpost failure
Third page — carbon seatpost failures at pinch clamp
Fourth page — carbon seatpost failure at section transition
Fifth page — carbon seatpost failure at pinch clamp
Sixth page — Race Face XY failure at head
Seventh page — seat clamp bolt failure
Eighth page — carbon post failure at pinch clamp
Ninth page — carbon post failure near seat clamp

Spokes

First page -- first-generation R-Sys failures after accidents; notable for the severity of the failures
Second page -- second-generation R-Sys failure

Sprockets

First page -- two teeth broken off 12T sprocket

Stem

First page — Quill stem failure at weld.