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Bicycle Parts For Sale By Owner in Boulder, CO

  1. see also
  2. 4 Bike/MultiSport Helmets
    $50
    Longmont
  3. NEW! Commuting Backpack with Helmet Pocket
    $40
    Longmont
  4. NEW Mountain Bike Shoes - size EUR 41
    $40
    Longmont
  5. NEW! $130 (2) Bike Cover for Bike Rack
    $90
    SW Longmont
  6. MTB Wheels Alexrims Racers Edge Adventurer + Bontrager
    $100
    South Boulder
  7. Topeak Super Tourist DX Disc Cargo Rack
    $40
    South Boulder
  8. Topeak MTX BeamRack Seatpost-mounted Cargo Rack
    $40
    South Boulder
  9. Thule Chariot Cougar 1 Trailer Stroller
    $40
    South Boulder
  10. Travel Trac Fluid+ Bicycle Trainer with Remote & Front Wheel Stand
    $120
    Louisville
  11. Yakima 2-Bike Hitch Rack for 1-1/4” Hitch Receiver Like New Condition
    $160
    Louisville
  12. TAG ALONG $40/ SHOES $20/ TRAINER $20/ BIKE borrow city $150/ xoearth
    $20
    Boulder
  13. HELMET FLAGS reflective/ BIKE RACK upgrade cargo/ TRAINER/ xoearth
    $35
    Boulder Central
  14. Yakima bike rack
    $300
    Boulder
  15. Soma Wolverine v4.1 50cm Frame
    $850
    Hygiene
  16. Bike shoes: Mens size 16: Shimano with clips: Never worn
    $50
    Frasier Meadows/Boulder
  17. Campagnolo Record 10 Speed Rear Derailleur
    $100
    Boulder
  18. Yakima 4 Bike rack 2" hitch complete
    $80
  19. NEW Slime Self-Sealing Bike/Bicycle 29" Inner Tube Schrader Valve
    $5
    Niwot
  20. CrankBrothers Highline 7 Dropper Post, 100mm, 31.6 Dropper Seatpost
    $40
    Boulder
  21. Carbon fiber race rim 29"
    $40
    Boulder
  22. 36V 10.4ah lithium ion battery
    $75
    Longmont
  23. Panache Women’s sleeveless cycling jersey
    $15
  24. Capo fleece long sleeve cycling jersey
    $15
  25. Capo windproof winter cycling jacket
    $20
  26. Specialized BG Toupe Comp Saddle 155
    $15
  27. Specialized Toupe Comp Gel saddle 155 - New
    $20
  28. Carbon 650b wheelset: LB rims + i9 hubs + Sapim spokes
    $500
    Boulder
  29. Bike storage floor stand
    $10
    Boulder
  30. Topeak Tri-cage Carbon (for under saddle) (x2)
    $30
    Boulder
  31. XCadey chainrings, 50/34t, 110 BCD, 5 bolts
    $20
    Boulder
  32. Yakama SuperJoe3 Trunk Bike Rack
    $75
    Hygiene
  33. Bicycle Rack
    $100
    Lafayette
  34. Used Trex black bicycle saddle seat
    $5
    Longmont
  35. 6KU Track Wheel Set
    $30
    Lafayette
  36. SR Suntour XCR34 29" Fork
    $50
    Lafayette
  37. Women's 'Specialized' Adjustable Bike Helmet
    $25
    SW Longmont
  38. Bontrager Carbon Cycling Shoes with eSoles - sz 45
    $75
    Longmont
  39. Racermate CompuTrainer Pro - Bike Trainer System
    $300
    Longmont
  40. BikeYoke Revive Max 160mm 34.9mm
    $280
    longmont
  41. Ibis Blackbird Send MX Mullet Wheelset
    $500
    longmont
  42. 2022 Performance Elite Series 34 FLOAT 29 140mm FIT4
    $400
    longmont
  43. Odyssey BMX Stem TDFL 45 degrees UNUSED
    $50
    Lafayette
  44. Schwinn Approved 1970’s Generator Lights /Germany
    $30
  45. Track Forks from the 50’s 1 inch.
    $60
  46. Bike racks x2
    $20
  47. Syntace Vector Carbon Bars MTB.
    $60
  48. Sport Rack Down Tube Adaptor
    $25
  49. Yakima Roof Top Bike Carriers / price is for both
    $140
  50. FSA 44 Tooth chain ring. 104 BCD
    $40
  51. Original Schwinn Grips
    $30
  52. Continental Home Trainer Tires 700c x2
    $25
  53. Easton Monkey Bar
    $40
  54. Forks 1 , 11/8 forks threaded.
    $40
  55. Mountain Bike Stem/Raceface
    $60
  56. TRP TRI Bike Brake Caliper Rear
    $40
  57. Reynolds Carbon Fork
    $60
  58. Bontrager Tire Hard case light 700x25
    $25
  59. Shimano Deore 9 Speed Shifter and Derailluer
    $25
  60. Cane Creek Headset 11/8 NEW
    $40
  61. Headset Cane Creek1 1/8 / Titanium preload assembly
    $50
  62. Bike Build Kit , Ultegra , Mavic, RXL, 105, Bontrager speed brakes.
    $200
  63. Nashbar Angliru Road Bike Pedals (Black)
    $20
    Boulder
  64. Trek Y-11 Carbon Fiber Bike Frame
    $80
    South Boulder
  65. Look Delta Bi-Matière road bike pedal cleats
    $20
    South Boulder
  66. Iberia Pak Rak Quick Release Trunk Bag and Rack Combo
    $50
    South Boulder
  67. Vintage Blackburn Bicycle Rear Cargo Rack
    $30
    South Boulder
  68. Velocity Blunt 35 Bicycle Rim 27.5
    $200
    South Boulder
  69. Performance Hitch Mount Bicycle Carrier
    $70
    South Boulder
  70. Axiom Pet Basket with Rack and Handlebar Mounts
    $60
    South Boulder
  71. Giant GX28 rim and Giant Crosscut tire
    $100
    South Boulder
  72. Shimano Deore XT Rear Hub
    $30
    South Boulder
  73. Bontrager Select Bicycle Rim - 26"
    $40
    South Boulder
  74. Topeak Alien II 31-function bicycle multi-tool
    $50
    South Boulder
  75. Yakima Hitch Mount 4 Bike Rack
    $80
    South Boulder
  76. Specialized Globe Pannier Adapters - Front
    $50
    South Boulder
  77. Trek Bontrager Interchange Removable Rear Basket
    $30
    South Boulder
  78. Saris Bones 2 Bike Trunk Rack
    $70
    South Boulder
  79. Nantucket Bike Basket
    $30
    South Boulder
  80. Thule 822 Bed Rider Truck Bike Mount Aluminium
    $60
    South Boulder
  81. Lemond Revmaster Pro Seat Post
    $10
    South Boulder
  82. Yakima Track Rail Bicycle Tray Carrier for Rooftop Racks 🚴
    $50
    South Boulder
  83. Calfee carbon fiber disc road fork
    $60
    Boulder
  84. 164 mm Brooks C17 Carved Saddle
    $125
  85. 142 mm Pro Stealth Team Saddle
    $200
  86. Bike Rack Front Wheel Mount * Yakima New
    $29
  87. saddle bags basket
    $40
    Longmont
  88. LOOK KEO Road Cleats Bicycle Pedal Red
    $10
    Boulder
  89. Pearl Izumi Cycling Shoes - sz 45.5
    $30
    Longmont
  90. $200 Rudy Project Airstorm Cycling Helmet
    $75
    SW Longmont
  91. Women's Giro Reva Mountain bike shoes - EU 39 - LIKE NEW
    $50
    Longmont
  92. Wahoo KICKR Core v4
    $250
  93. Yakima 2-Bike Hitch Rack for 2” Hitch Receiver
    $120
    Louisville
  94. Giro Mountain Bike Helmet
    $15
    Boulder
  95. Bike Light - LED headlight and rear light
    $15
    Boulder
  96. Selle Italia X-LR Kit Carbonio Superflow, Saddle, 268 x 140mm, 138g, B
    $120
    Boulder
  97. ITM Aluminum Road Bike Drop Bar Handlebar
    $40
    Boulder
  98. Manitou Machete 29+ 120mm travel
    $100
    Longmont
  99. 2023 Fox Transfer SL 31.6 new in box
    $200
    Longmont
  100. Bicycle Basket
    $20
    Longmont
  101. 2 fork mount bike holders
    $20
    Longmont
  102. Rolf Sestriere Front Wheel
    $39
    Erie
  103. Pearl Izumi Men’s Elite V3 Road Shoes 46.5
    $25
    Erie
  104. Sidi Men’s Road Shoes Size 46
    $25
    Erie
  105. Vintage 80s Guerciotti Sprint Red Frame Fork CAMPAGNOLO Etc. 56cm
    $130
    Metro Denver
  106. Yakima 2-Bike Hitch Rack for 2” Hitch Receiver
    $140
    Louisville
  107. Dog leash for bikes
    $25
  108. Specialized S Works Carbon 175mm 52/36 11-speed BB30 crankset
    $120
  109. Rock Shox Reverb dropper seat post 100mm x 31.6 - needs some work
    $50
    Boulder
  110. FOX Transfer Factory Dropper Seatpost 175mm x 30.9
    $100
    Boulder
  111. KS Cruxi CRUXi Dropper Seatpost 100mm travel x 31.6 diam
    $70
    Boulder
  112. Shimano ME4 Trail SPD Shoes EU39
    $50
    Boulder
  113. Kids MTB gear lot everything you need - shoes,shirts, gloves pand pads
    $25
    Boulder
  114. TYMO hair straightener comb **NEW
    $40
    Broomfield
  115. Bike Anti Theft Alarm *NEW
    $10
    Louisville
  116. 29" alluminum front rim
    $20
    Boulder
  117. Bontrager GR Elite Isozone Gravel Handlebars 31.8mm 42cm New
    $40
    Boulder
  118. HighPOWER Li-Ion Battery Charger Model HP8204L2 Input 115/230VAC 60/50
    $60
    Boulder
  119. Lauf True Grit medium carbon frameset
    $600
    Boulder
  120. Crank Brothers Eggbeater 3 AND refresh kit AND cleats
    $80
    Boulder
  121. Tailfin Top Tube Bag
    $40
    Boulder
  122. Road Runner California Burrito Handlebar Bag: 3.3L
    $40
    Boulder
  123. E-Bike Loading RAMP + License Plate Relocation Bracket
    $80
    Longmont
  124. Bike Shoes - Men's/Women's
    $40
    Longmont
  125. WTB bicycle saddles
    $75
    Boulder
  126. Feedback Sprint Repair Stand
    $120
    Boulder
  127. Water Bottle Carrier - Profile Design RML
    $30
    Boulder
  128. Shimano Ultegra pedals (look)
    $50
    Boulder
  129. KEO Carbon Pedals (look)
    $50
    Boulder
  130. Sram Crankset Rival 22 175mm BB30 - $100
    $100
    Boulder
  131. Sram Crankset X7 175mm BB30
    $100
    Boulder
  132. Shimano Dura Ace RD-7700 9-Speed Rear Derailleur
    $30
  133. Fork Up - Cannondale Lefty Wheel Mount
    $15
  134. SRAM GXP Carbon Crank - Direct Fit chainrings with spider
    $40
  135. Cannondale SI Spidering Plateau Chainring 32t - NEW
    $35
  136. NEW! Osprey Berm 12L Biking Backpack
    $100
    Longmont
  137. NEW! Cycling Shoes with BOA with cleats and shoe covers
    $75
    Longmont
  138. Shimano Gravel/MTB Shoes XC702 Wide
    $110
    Longmont
  139. Various bike parts
    $0
  140. Bike Project: Steel Bike Frame with parts
    $20
    Longmont
  141. Simonetti Aero Aluminum Bike Frame
    $150
    Longmont
  142. $110 GORE Bike Wear Gore-Tex Shoe Covers
    $60
    Longmont
  143. NEW with tag! Pearl Izumi Elite Women's Drop Tail Cycling Bibs - SMALL
    $80
    Longmont
  144. NEW! BOA Cycling Shoes with cleats and shoe covers
    $75
    Longmont
  145. Biking Clothes - Men's S,M,L
    $0
    Longmont
  146. NEW! Mountain Bike Shoes, SPD - EU 40
    $30
    Longmont
  147. NEW Mt Bike Tire - 26" x 1.90"
    $20
    Longmont
  148. (2) NEW IN BOX! Yakima LockJaw Rooftop Bike Trays
    $150
    Longmont
  149. PNW loam carbon handlebar
    $120
    Lafayette
  150. Fox, TLD SS Jerseys (3) Men's Size L
    $85
    Boulder
  151. New Knog Oi Bike Bell
    $15
    Boulder
  152. Float Float X/DPX2 (1/2" shaft) Volume Tuning Kit
    $10
    Boulder
  153. Shimano ME5 MTB Shoes Men's 10.5
    $50
    Boulder
  154. Specialized 29x2.0 Tubeless Ready Tire
    $30
    Longmont
  155. New! 26" Street Tires
    $30
    Longmont
  156. Louis Garneau Ergo Air Carbon Cycling Shoes - size EU 42
    $60
    Longmont
  157. Locking Bicycle Hamdlebar Grips
    $15
  158. Ritchey Carbon Breakaway Travel Bike
    $2,000
    Lafayette
  159. Fuji Track Pro Track Bike
    $550
  160. New Shimano WR 62L Dynalast Carbon Cycling Shoes-Size 38
    $50
    Louisville, CO
  161. womans Specialized Road bike shoes, new
    $40
    south boulder
  162. Rocky Mounts Step Thru Frame Brace
    $15
  163. Yakima Bike Rack
    $80
    Longmont
  164. Bike Carrier for Car
    $25
    Erie
  165. 2025 RockShox Lyrik 150mm 44mm offset
    $375
    Erie
  166. Shimano GRX shifter/caliper F&R 2X11
    $200
    Erie
  167. SRAM GX Eagle Cassette
    $35
  168. Specialized Avatar Gel Body Geometry 143 mm Saddle / Seat
    $30
    Boulder
  169. WTB Pure V Sport Bike Saddle / Seat
    $30
    Boulder
  170. Yakima Spare Ride 2-bike Bicycle rack for Jeep Wrangler
    $199
    North Boulder
  171. Marin MTB bike seat / saddle
    $20
    Boulder
  172. 2 Lolo bicycle handlebar rack mounts
    $25
    Boulder
  173. Ceiling Bicycle hangars
    $10
    longmont
  174. SRAM Force GXP Crankset w/ X-Sync 42T
    $30
    broomfield
  175. SRAM Force 1X DUB 172.5mm
    $110
    Longmont
  176. Banjo Brothers Bicycle Rack Top Bag very good condition
    $20
    Boulder
  177. Planet Bike Mini Versair Pump
    $15
    Boulder
  178. Silca Tattico Mini Pump
    $30
    Boulder
  179. Shimano Ultegra HG800 11 speed cassette 11x34
    $50
    Boulder
  180. Shimano HG-700 11 speed cassette 11x34 mint condition
    $30
    Boulder
  181. Whisky Parts No. 7 Carbon Seatpost 30.9 x 400mm straight
    $65
    Boulder
  182. Redshift Sports ShockStop PRO Suspension Handlebar Stem 90mm +/- 6 deg
    $150
    Boulder
  183. Quality Wheels RS505/DT R500 Disc Rear Wheel (700c) (12 x 142mm)
    $60
    Boulder
  184. Mason x Hunt 4 Season tubeless disc rear wheel 700c Shimano freehub
    $100
    Boulder
  185. Hard case for bicycles with S&S couplings
    $200
    Broomfield
  186. Rocky Mounts locking fork mounts
    $50
    Broomfield
  187. Rocky Mounts hitch mount bike rack.
    $495
  188. Ortlieb Waterproof Bike Panniers
    $100
    Boulder
  189. Sidi Dragon 3 Carbon MTB Size 44
    $50
    Louisville
  190. Thule Wheel On wheel carrier
    $35
    Erie
  191. Mustache Bars
    $45
    Erie
  192. Bike Rack Front Wheel Mount * Yakama New
    $29
  193. Bike Car Rack RockyMounts Tray
    $29
  194. Bike Rack Tray Car Mount
    $29
  195. New in Box: RaceInc Pro XL BMX Frame Black Matte
    $499
    Boulder
  196. Bike Stand
    $35
  197. SQLab 30X 12 degree mid-rise bar
    $60
    Boulder
  198. Ergon SR Allroad Core saddle
    $60
    Boulder
  199. 1993 Vintage Blackburn Bicycle Rack Strap
    $8
    Longmont
  200. Vintage 1992 Giant Bike Expandable Accessory Bag
    $8
    Longmont
  201. Adjustable BV Bike Kickstand
    $12
    South Boulder
  202. Premium Gravel/Road Bike Parts
    $0
  203. Deda Zero100 Team Stem- NEW!
    $55
    Boulder
  204. Shimano Ultegra Rear Derailleur 11 Speed
    $35
    Boulder
  205. LOOK A-Stem
    $85
    Boulder - Longmont - Denver
  206. Shimano Di2 Remote Climbing Shifter
    $40
    Boulder - Longmont - Denver
  207. Thule Velo Vise Fork-Mount bike trays and cross bars
    $35
    Boulder
  208. Bike rack for trunk
    $20
  209. Bike rack - trunk
    $30
  210. TriRig carbon mini open back arm cups for aero bars
    $36
    East Longmont
  211. MKS Sylvan touring pedals
    $20
    Longmont
  212. Road Cycling Gear Bundle -- Lumos Helmet + Cycling Shoes w/Cleats + GripGrab Glo
    $85
    Boulder
  213. BRAND NEW, OLD STOCK- 2000 Bob Yak Plus Dry Sak Silver Trailer
    $400
  214. 26 inch presta valve bike tubes
    $10
    Longmont
  215. Dero Fixit Repair Station NEW
    $400
    Longmont
  216. Cycle Ops (CycleOps) bicycle trainer
    $40
    Wheat Ridge
  217. ENVE SES 3.4 AR Disc Wheels NIB
    $1,800
    S Boulder
  218. 26x2.35 City Tires Used
    $18
    S Boulder
  219. 3T Stem 120mm
    $24
    S Boulder
  220. 3T Carbon Handlebar, Stem, Seatpost w Olympic Graphics
    $395
    S Boulder
  221. Selle Italia Flite Saddle - Giro d'Italia Special Edition- NIB
    $95
    S Boulder
  222. Campagnolo Tool Set
    $4,750
    S Boulder
  223. NOS Campagnolo C Record Rear Hub 32h
    $120
    S Boulder
  224. Mapei Socks- Defeet
    $20
    S Boulder
  225. Bicycle Work Stand (Feedback Sports)
    $150
    So Boulder
  226. 2025 Bontrager Line Comp 30 Wheelset
    $325
    Boulder
  227. Via Velo Bike Lock
    $20
    Boulder
  228. Answer ProTaper carbon fiber handlebar
    $40
    Louisville
  229. Shimano Dura Ace CS-7700 9 Speed Cassette
    $35
    Longmont
  230. Shimano Ultegra FC-6500/6503 172.5mm Crankset Double 53/39T 9-Speed
    $30
    Longmont
  231. Trek Saddle Bags
    $20
    E Boulder
  232. Fox Float X2 FACTORY SERIES 210 x 55 mm (Standard Metric)
    $150
    Lafayette
  233. Thule bike rack
    $99
    Boulder
  234. Specialized Roubaix Expert 2010
    $499
    Boulder
  235. David’s bridal size 4 grey lace dress
    $5
    Boulder
  236. Red wrap around Ann Taylor dress extra small
    $5
    Boulder
  237. Shimano Bike Cycling Shoes Mens 47 EU 2 bolt
    $40
    Boulder
  238. Assos Mercedes AMG Petronas Full-length Sleeve Jersey (White) - Small
    $25
    Boulder
  239. Saris 2 Bike Rack
    $300
    Boulder
  240. Canyon integrated carbon handlebar 46mmx80mm
    $200
  241. Thomson carbon road handlebar 46mm
    $100
  242. Campagnolo Chorus 10spd group set
    $400
    Boulder
  243. Performance Bicycle Roller / Trainer
    $25
  244. Yakima 2 bike locking rack
    $150
  245. Bontrager RACE Threadless Alloy Road Stem
    $13
    Longmont
  246. Bontrager Race Alloy Seat Post
    $15
    Longmont
  247. Bontrager Race Alloy Handle Bars
    $15
    Longmont
  248. Selle Italia SLK Saddle
    $12
  249. New / Never mounted Kenda Kaliente L3R Pro Road Tire
    $15
  250. Garage cleanup (MTB )
    $123
    Boulder
  251. Comfy bike seats and new E Bike Tires
    $180
    S Boulder
  252. Fox 38 170 29er Fork
    $350
    Lafayette
  253. New In Box SIZE 12!SPECIALIZED 2FO "Clip in " Enduro/ Dh shoes
    $40
    Longmont
  254. Bike Stand - Ninja Stoke - Wood
    $25
  255. Kids Pearl iZumi wind jacket and vest
    $20
  256. Troy Lee Designs Stage - Small Full Face
    $100
  257. [brand new] Oquo (Orbea) MC32 Mountain Bike Wheels w/ tires and rotors
    $400
    Boulder
  258. Carradice Super C saddlebag
    $50
  259. Assioma pro mx power meter
    $350
  260. Kinetic indoor bike trainer
    $50
    Boulder
  261. 2022 SRAM GX Eagle 1275, 12 Speed Cassette, 10-52T
    $100
    Boulder
  262. SRAM XX1 Eagle DM DUB "Boost" Carbon Crankset
    $225
    Boulder
  263. MAXXIS Rekon 27.5x2.6 mountain bike tires
    $10
    Longmont
  264. BMA Bike Jersey
    $25
    Louisville
  265. Guess silky small flower dress
    $3
    Boulder
  266. Brooks cambium C15 saddle, like new
    $100
    Boulder
  267. Yakima Bike Rails
    $45
    Lafayette
  268. 2-Bike hitch mounted bike rack
    $50
    Lafayette
  269. Yakima Hitch Bike Rack
    $475
    Lafayette
  270. WTB Silverado Saddle - Titanium
    $70
  271. Continental 4Season 25mm Brand New Road Tire
    $50
    Superior
  272. SID Ultimate 120mm travel 44 rake-remote ready
    $500
    boulder
  273. Thumb throttle for ebike
    $10
    Louisville
  274. Yakima hitch mount hanging bike rack with integrated cable lock
    $100
    Superior
  275. RockyMounts 2-bike Hitch Rack
    $120
  276. Thule 56" square crossbars
    $50
    Longmont
  277. Rocky Mounts 2 Bike Hitch Rack - 1inch
    $100
  278. Tubus Duo front rack
    $40
  279. Giant XCR XL Frame: SL-Aluxx
    $400
    Superior
  280. Absolute Black 38t round chainring. 104 bcd
    $40
  281. Mavic 700c road bike carbon fiber front wheel
    $60
    Boulder
  282. Rhode Gear Bike Trunk
    $20
    Martin Acres
  283. Sram X01 11 speed cassette new 11-42
    $200
    Boulder