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Bicycle Parts For Sale By Owner in Boulder, CO

  1. see also
  2. ITM Aluminum Road Bike Drop Bar Handlebar
    $40
    Boulder
  3. Nashbar Angliru Road Bike Pedals (Black)
    $20
    Boulder
  4. Bike Project: Steel Bike Frame with parts
    $20
    Longmont
  5. Shimano XTR MTB M9000 Polymer-Coated Derailleur Cable Set
    $40
    Niwot
  6. Alugear 44t oval 107bcd 1-by chainring
    $15
    Boulder
  7. New in Box: RaceInc Pro XL BMX Frame Black Matte
    $499
    Boulder
  8. Bicycle Rack
    $100
    Lafayette
  9. Biking Clothes - Men's S,M,L
    $0
    Longmont
  10. NEW! Osprey Berm 12L Biking Backpack
    $80
    Longmont
  11. Shimano 12speed cassette NEW
    $80
  12. Bontrager Speed Brake Set Unused
    $80
    Lafayette
  13. Race light stem white perfect
    $30
    Lafayette
  14. Durace crankset 172.5 Single ring with BB
    $50
    Lafayette
  15. 105 3x10 Shifters work perfectly small scratches
    $80
    Lafayette
  16. Odyssey BMX Stem TDFL 45 degrees UNUSED
    $50
    Lafayette
  17. Headset Cane Creek1 1/8 / Titanium preload assembly
    $50
  18. Cane Creek Headset 11/8 NEW
    $40
  19. Schwinn Approved 1970’s Generator Lights /Germany
    $30
  20. Forks 1 , 11/8 forks threaded.
    $40
  21. Easton Monkey Bar
    $40
  22. Syntace Vector Carbon Bars MTB.
    $60
  23. Sport Rack Down Tube Adaptor
    $25
  24. Original Schwinn Grips
    $30
  25. Bontrager Tire Hard case light 700x25
    $25
  26. Continental Home Trainer Tires 700c x2
    $25
  27. Yakima Roof Top Bike Carriers / price is for both
    $140
  28. Mountain Bike Stem/Raceface
    $60
  29. FSA 44 Tooth chain ring. 104 BCD
    $40
  30. Shimano 11 speed hydraulic road levers. New
    $100
  31. 29" alluminum front rim
    $20
    Boulder
  32. Bontrager GR Elite Isozone Gravel Handlebars 31.8mm 42cm New
    $40
    Boulder
  33. HighPOWER Li-Ion Battery Charger Model HP8204L2 Input 115/230VAC 60/50
    $60
    Boulder
  34. Shimano Ultegra ST-R8020 Hydraulic Shift/Brake Lever - RIGHT
    $40
  35. Knight 25 Clincher Alloy Tubeless (TLA) – Disc rear wheel
    $15
  36. Knight 25 Clincher Alloy Tubeless (TLA) – Disc front wheel
    $50
  37. Capo windproof winter cycling jacket
    $15
  38. Capo fleece long sleeve cycling jersey
    $10
  39. CrankBrothers Highline 7 Dropper Post, 100mm, 31.6 Dropper Seatpost
    $40
    Boulder
  40. Demon Podium X MIPS Full Face Mountain Bike Helmet
    $135
  41. NEW Mt Bike Tire - 26" x 1.90"
    $20
    Longmont
  42. Ceiling Bicycle hangars
    $10
    longmont
  43. PNW Range Drop Bars - 44cm
    $20
    Louisville
  44. NEW! Cycling Shoes with BOA with cleats and shoe covers
    $75
    Longmont
  45. Women's Giro Reva Mountain bike shoes - EU 39 - LIKE NEW
    $50
    Longmont
  46. Look KEO Clipless Road Bike Pedals Black, Carbon
    $15
    Erie
  47. Look KEO Clipless Road Bike Pedals Black, Carbon
    $15
    Erie
  48. Shimano PD-R540 SPD-SL Clipless Road Bike Pedals Black
    $15
    Erie
  49. Saris Bike Beam Adapter Top Bar
    $30
    South Boulder
  50. Bike storage floor stand
    $10
    Boulder
  51. XCadey chainrings, 50/34t, 110 BCD, 5 bolts
    $20
    Boulder
  52. Topeak Tri-cage Carbon (for under saddle) (x2)
    $30
    Boulder
  53. PRO Turnix Carbon Road Bike Saddle 142mm
    $40
    Boulder
  54. Kuat Beta 1.25” Hitch-Mount Bike Carrier
    $180
    Boulder
  55. Shimano Essa Derailluer
    $25
    Lafayette
  56. Shimano MT step in pedals
    $25
    Lafayette
  57. Shimano step in bindings.
    $25
    Lafayette
  58. Speedplay Frog Pedals
    $100
    Lafayette
  59. Bike Jump
    $85
  60. NEW! $130 (2) Bike Cover for Bike Rack
    $80
    SW Longmont
  61. MCFK Carbon Leather saddle
    $150
    Boulder
  62. Ergon SR Allroad Core saddle
    $60
    Boulder
  63. Thule 822 Bed Rider Truck Bike Mount Aluminium
    $60
    South Boulder
  64. Yakima Track Rail Bicycle Tray Carrier for Rooftop Racks 🚴
    $50
    South Boulder
  65. OEM Kona Bicycle Saddle
    $20
    South Boulder
  66. The Tioga Undercover Stratum Saddle with Titanium rails
    $80
    South Boulder
  67. Giant Seat and Post
    $30
    South Boulder
  68. Yakima TubeTop Bicycle Frame Adapter
    $30
    South Boulder
  69. Yakima Double Down 4 Hitch-Mounted Bicycle Rack
    $120
    South Boulder
  70. E-Bike Battery, Downtube Mount and Charger 🚲
    $50
    South Boulder
  71. Shimano Altus FC-M371 Crankset
    $30
    South Boulder
  72. Shimano Altus SLM2010 Shifter + FDM370 Derailleur
    $20
    South Boulder
  73. Shimano CX75 / Carbon-Laminate 700c Disc Wheelset – Tubular (Glue-On)
    $250
    South Boulder
  74. MTB Wheels Alexrims Racers Edge Adventurer + Bontrager
    $100
    South Boulder
  75. Topeak Super Tourist DX Disc Cargo Rack
    $40
    South Boulder
  76. Topeak MTX BeamRack Seatpost-mounted Cargo Rack
    $40
    South Boulder
  77. Thule Chariot Cougar 1 Trailer Stroller
    $40
    South Boulder
  78. Look Delta Bi-Matière road bike pedal cleats
    $20
    South Boulder
  79. Iberia Pak Rak Quick Release Trunk Bag and Rack Combo
    $50
    South Boulder
  80. Trek Y-11 Carbon Fiber Bike Frame
    $80
    South Boulder
  81. Velocity Blunt 35 Bicycle Rim 27.5
    $200
    South Boulder
  82. Vintage Blackburn Bicycle Rear Cargo Rack
    $30
    South Boulder
  83. Performance Hitch Mount Bicycle Carrier
    $70
    South Boulder
  84. Axiom Pet Basket with Rack and Handlebar Mounts
    $60
    South Boulder
  85. Giant GX28 rim and Giant Crosscut tire
    $100
    South Boulder
  86. Shimano Deore XT Rear Hub
    $30
    South Boulder
  87. Bontrager Select Bicycle Rim - 26"
    $40
    South Boulder
  88. Topeak Alien II 31-function bicycle multi-tool
    $50
    South Boulder
  89. Specialized Globe Pannier Adapters - Front
    $50
    South Boulder
  90. Trek Bontrager Interchange Removable Rear Basket
    $30
    South Boulder
  91. Saris Bones 2 Bike Trunk Rack
    $70
    South Boulder
  92. Nantucket Bike Basket
    $30
    South Boulder
  93. Simonetti Aero Aluminum Bike Frame
    $100
    Longmont
  94. Via Velo Bike Lock
    $15
    Boulder
  95. Vintage 1992 Giant Bike Expandable Accessory Bag
    $8
    Longmont
  96. 1993 Vintage Blackburn Bicycle Rack Strap
    $8
    Longmont
  97. Vintage USA Concord Bicycle Replacement Tube, Unused - 26 x 1.5
    $3
    Longmont
  98. NEW with tag! Pearl Izumi Elite Women's Drop Tail Cycling Bibs - SMALL
    $80
    Longmont
  99. NEW! BOA Cycling Shoes with cleats and shoe covers
    $75
    Longmont
  100. REEB x Dale's Pale Ale MTB Jersey
    $40
  101. Vintage Salsa Cycles Jersey
    $20
  102. Pearl Izumi Cycling Shoes - sz 45.5
    $30
    Longmont
  103. Louis Garneau Ergo Air Carbon Cycling Shoes - size EU 42
    $60
    Longmont
  104. Used Trex black bicycle saddle seat
    $5
    Longmont
  105. Salsa • Seatpost Clamp • 35mm
    $10
  106. E-Bike Loading RAMP + License Plate Relocation Bracket
    $80
    Longmont
  107. GORE Bike Wear Gore-Tex Shoe Covers
    $50
    Longmont
  108. New! 26" Street Tires
    $30
    Longmont
  109. Bontrager Carbon Cycling Shoes with eSoles - sz 45
    $60
    Longmont
  110. Bike Shoes - Men's/Women's
    $40
    Longmont
  111. NEW! Mountain Bike Shoes, SPD - EU 40
    $30
    Longmont
  112. TYMO hair straightener comb **NEW
    $40
    Broomfield
  113. RevArc snowmobile ramp
    $250
    Boulder
  114. Campagnolo Chorus 10spd group set
    $400
    Boulder
  115. Bike Pedals -Spd Shimano Clipless Mtb. *Like New
    $39
    Lafayette
  116. TRP Spyre Post-Mount Disc Brake Caliper - New in Box
    $40
  117. G-Form Pro-X3 Elbow Pads - Size Large
    $20
  118. Specialized S Works Carbon 175mm 52/36 11-speed BB30 crankset
    $120
  119. Road Bike stems and Mountain Bike Stems
    $10
    Louisville
  120. RST Dirt Jump Fork 26"
    $20
    Louisville
  121. Seatposts and Road Handlebars
    $10
    Louisville
  122. Brake parts
    $15
    Louisville
  123. Road saddles and Mountain bike saddles
    $10
    Louisville
  124. Shimano hydraulic Di2 11 speed electronic shifter set
    $200
    Louisville
  125. Redshift Shockstop Suspension stem 110mm, 31.8 new in box
    $120
    Louisville
  126. 4 Bike/MultiSport Helmets
    $40
    Longmont
  127. NEW Mountain Bike Shoes - size EUR 41
    $40
    Longmont
  128. BOB Yak trailer with skewer
    $75
    Longmont, CO
  129. Performance Bike Box / Cargo Case
    $75
    Louisville
  130. (2) NEW IN BOX! Yakima LockJaw Rooftop Bike Trays
    $100
    Longmont
  131. Cycle Ops (CycleOps) bicycle trainer
    $30
    Wheat Ridge
  132. womans Specialized Road bike shoes, new
    $40
    south boulder
  133. New Shimano Ultegra ST-6800-11 Speed Brake Hood Covers
    $15
    Louisville, CO
  134. NEW! Commuting Backpack with Helmet Pocket
    $40
    Longmont
  135. Women's 'Specialized' Adjustable Bike Helmet
    $25
    SW Longmont
  136. Racermate CompuTrainer Pro - Bike Trainer System
    $300
    Longmont
  137. Specialized 29x2.0 Tubeless Ready Tire
    $30
    Longmont
  138. $200 Rudy Project Airstorm Cycling Helmet
    $75
    SW Longmont
  139. Adjustable BV Bike Kickstand
    $12
    South Boulder
  140. Bike Rack Front Wheel Mount * Yakama New
    $29
  141. Locking Bicycle Hamdlebar Grips
    $15
  142. Bike Rack Tray Car Mount
    $29
  143. Bike Rack - 4bike Rack - Allen 542RR - $100
    $100
  144. Bike Car Rack RockyMounts Tray
    $29
  145. Yakima bike rack
    $300
    Boulder
  146. 26x2.35 City Tires Used
    $18
    S Boulder
  147. ENVE SES 3.4 AR Disc Wheels NIB
    $1,800
    S Boulder
  148. 3T Stem 120mm
    $24
    S Boulder
  149. 3T Carbon Handlebar, Stem, Seatpost w Olympic Graphics
    $395
    S Boulder
  150. Gravel bike wheelset 27.5
    $150
    Lafayette
  151. Yakima Freeloader
    $80
    Erie
  152. Thule Wheel On wheel carrier
    $35
    Erie
  153. Mustache Bars
    $45
    Erie
  154. Rocky Mounts locking fork mounts
    $50
    Broomfield
  155. Yakima 2-Bike Hitch Rack for 2” Hitch Receiver
    $120
    Louisville
  156. Yakima 2-Bike Hitch Rack for 2” Hitch Receiver
    $160
    Louisville
  157. Travel Trac Fluid+ Bicycle Trainer with Remote & Front Wheel Stand
    $120
    Louisville
  158. Various bike parts
    $0
  159. Yakima FullSwing 4 Bike Hitch Mount Rack
    $200
    Boulder
  160. Shimano Deore FH-M510 Rear Cassette MTB Hub 32 Hole
    $20
    Boulder
  161. Burley Solo 1 Child Bike Trailer
    $50
    Boulder
  162. MKS Sylvan touring pedals
    $20
    Longmont
  163. Roval Terra C III Carbon Gravel Wheels - New, Take Offs
    $750
    Gunbarrel
  164. Rock Shox Reba RL 29" 120mm travel Boost 110mm hub
    $160
    North Boulder
  165. Patagonia Landfarer MTB Shorts (2) Men's 35/36
    $90
    Boulder
  166. Fox, TLD SS Jerseys (3) Men's Size L
    $75
    Boulder
  167. Float Float X/DPX2 (1/2" shaft) Volume Tuning Kit
    $10
    Boulder
  168. New Knog Oi Bike Bell
    $12
    Boulder
  169. New/unused set of Trek Bontrager Paradigm Comp 25 road wheels
    $325
  170. Kazam kids bike trailer
    $100
    South Boulder
  171. CycleOps indoor bike trainer
    $55
    Longmont CO
  172. Bike rack
    $10
  173. 2026 ENVE G SES 4.5 Gravel Wheelset 30mm IW Disc XDR 12/13 Spd
    $2,100
  174. Shimano Ultegra RD-6700 Rear Derailleur
    $40
    Boulder
  175. Shimano Ultegra ST-6600 Shifters (PAIR)
    $90
    Boulder
  176. Shimano Ultegra FD-R6000 Front Derailleur
    $15
    Boulder
  177. Shimano Ultegra Rear Derailleur RD-6800
    $25
    Boulder
  178. Shimano ST-RS685 Shifters (PAIR)
    $100
    Boulder
  179. Shimano BR-RS785 Brake Calipers (PAIR)
    $50
    Boulder
  180. Shimano Ultegra ST-R8020 Shifters (2x11 speed, mechanical, hydraulic)
    $150
    Boulder
  181. Shimano Ultegra Hydraulic Brake Calipers BR-R8070 (PAIR)
    $65
    Boulder
  182. Shimano Ultegra Rear Derailleur - RD-R8000
    $60
    Boulder
  183. Shimano Ultegra Front Derailleur - FD-R8000
    $25
    Boulder
  184. Shimano GRX 11s Chainset (48-31, 172.5mm)
    $75
    Boulder
  185. Shimano Ultegra 11s FC-R8000 Crankset 50-34 172.5
    $90
    Boulder
  186. FSA Energy Compact Allow Handlebars (440mm, 31.8)
    $35
    Boulder
  187. FSA Energy Compact Allow Handlebars (400mm, 31.8)
    $50
    Boulder
  188. Bontrager ELITE ISOZONE Handlebars (42cm, 31.8)
    $60
    Boulder
  189. Ritchey WCS Toyon alloy stem (110mm, 6/84 degrees, 31.8) Like New
    $75
    Boulder
  190. Ritchey WCS alloy stem (130mm, 6/84 degrees, 31.8)
    $20
    Boulder
  191. Tesla Bike Rack
    $300
    Superior
  192. Brand new Pace Road shoes (44)
    $75
    Boulder
  193. Arkel Pannier Bags
    $80
    Loveland
  194. RIGd RambleRack Heavy Duty Bike Hitch Rack Kit
    $700
    Louisville
  195. Rocky Mounts Step Thru Frame Brace
    $15
  196. Rock Shox Reverb dropper seat post 100mm x 31.6 - needs some work
    $50
    Boulder
  197. FOX Transfer Factory Dropper Seatpost 175mm x 30.9
    $100
    Boulder
  198. KS Cruxi CRUXi Dropper Seatpost 100mm travel x 31.6 diam
    $70
    Boulder
  199. 2 fork mount bike holders
    $20
    Longmont
  200. Silca Elettrico Ultimate Tire Inflator
    $100
    Research Park/Boulder
  201. Giro arrowhead helmet
    $100
    Boulder
  202. Burley D-lite Brand New
    $175
  203. Rotor Rex 1x Crankset (32t chainring included)
    $100
    Boulder Junction
  204. Trek Saddle Bags
    $20
    E Boulder
  205. Shimano Ultegra FC-6500/6503 172.5mm Crankset Double 53/39T 9-Speed
    $20
    Longmont
  206. Shimano Dura Ace CS-7700 9 Speed Cassette
    $25
    Longmont
  207. Specialized S-Works Power Mirror Saddle Black 155mm
    $250
    Boulder
  208. Emporia GC3 Pro Gravel HED Wheels
    $900
    Boulder
  209. Ride on!! This Bitch Seat Rules
    $20
    Louisville
  210. Bontrager Race Lite 44cm Drop bars
    $40
  211. Quality Wheels RS505/DT R500 Disc Rear Wheel (700c) (12 x 142mm)
    $80
    Boulder
  212. Redshift Sports ShockStop PRO Suspension Handlebar Stem 90mm +/- 6 deg
    $150
    Boulder
  213. Whisky Parts No. 7 Carbon Seatpost 30.9 x 400mm straight
    $65
    Boulder
  214. Shimano HG-700 11 speed cassette 11x34 mint condition
    $30
    Boulder
  215. Shimano Ultegra HG800 11 speed cassette 11x34
    $50
    Boulder
  216. Silca Tattico Mini Pump
    $30
    Boulder
  217. Planet Bike Mini Versair Pump
    $15
    Boulder
  218. Banjo Brothers Bicycle Rack Top Bag very good condition
    $20
    Boulder
  219. Saris Bike Trainer
    $40
    Boulder
  220. Brooklyness Classon Smart Helmet OBO
    $29
    Boulder
  221. Complete Yakima roof rack system
    $500
    Boulder
  222. 142 mm Pro Stealth Team Saddle
    $200
  223. 164 mm Brooks C17 Carved Saddle
    $125
  224. Thule Raceway Pro 2 2-bike rack - unused and in original box
    $250
    Lafayette
  225. Indoor bike trainer road or mtb
    $60
    Lafayette
  226. MAXXIS Rekon 27.5x2.6 mountain bike tires
    $10
    Longmont
  227. Sidi Men’s Road Shoes Size 46
    $25
    Erie
  228. Pearl Izumi Men’s Elite V3 Road Shoes 46.5
    $25
    Erie
  229. Rolf Sestriere Front Wheel
    $39
    Erie
  230. Bike Rack Front Wheel Mount * Yakima New
    $29
  231. Shimano Gravel/MTB Shoes XC702 Wide
    $110
    Longmont
  232. SRAM Force AXS E1 Power Meter Crankset 170mm/33-46T/DUB/12speed
    $400
    Longmont
  233. Ritchey Carbon Breakaway Travel Bike
    $2,000
    Lafayette
  234. I ❤︎⁠ Singletrack T-Shirt by MTB West
    $15
    Boulder/Nederland
  235. Bontrager RACE Threadless Alloy Road Stem
    $10
    Longmont
  236. Bontrager Race Alloy Seat Post
    $12
    Longmont
  237. Bontrager Race Alloy Handle Bars
    $12
    Longmont
  238. Selle Italia SLK Saddle
    $12
  239. Rare Mavic Ksyrium SL Tour de France Centenary Edition Front Wheel - 700c
    $80
    Niwot
  240. Bike rack
    $20
    Lafayette
  241. Water Bottle Carrier - Profile Design RML
    $30
    Boulder
  242. Shimano Ultegra pedals (look)
    $50
    Boulder
  243. Sram Crankset Rival 22 175mm BB30 - $100
    $100
    Boulder
  244. KEO Carbon Pedals (look)
    $50
    Boulder
  245. Sram Crankset X7 175mm BB30
    $100
    Boulder
  246. Ibis Blackbird Send MX Mullet Wheelset
    $500
    longmont
  247. BikeYoke Revive Max 160mm 34.9mm
    $280
    longmont
  248. Giro Mountain Bike Helmet
    $15
    Boulder
  249. Bike Light - LED headlight and rear light
    $15
    Boulder
  250. Specialized Cycling Shoes Men's Size 11 (EU44)
    $30
    Longmont
  251. Topeak Explorer Rack
    $25
    Longmont
  252. Crankbrothers Eggbeater Pedals
    $20
    Longmont
  253. Zipp 808 Firecrest 11spd set - Carbon Clincher
    $775
    Crestview Estates
  254. Zipp Super 9 Disc Wheel: 2016
    $625
    Crestview Estates
  255. Specialized S-Works Recon mtb shoes size 8 US 41 Euro
    $200
    East Boulder
  256. Shimano Di2 Remote Climbing Shifter
    $40
    Boulder - Longmont - Denver
  257. LOOK A-Stem
    $85
    Boulder - Longmont - Denver
  258. Shimano Ultegra Rear Derailleur 11 Speed
    $35
    Boulder
  259. Deda Zero100 Team Stem- NEW!
    $55
    Boulder
  260. Park Tool Double-Sided Repair Stand & Base
    $150
    Boulder
  261. E-Bike Electric Motor Adapter Kit
    $395
    Lafayette
  262. Kuat NV2.0 Bike Rack Extension
    $450
  263. Yakima hitch mount hanging bike rack with integrated cable lock
    $100
    Superior
  264. Bicycle Hangers - 3x Wall Mount Hangers
    $25
    Louisville
  265. North Shore 6 Bike Hitch Rack
    $600
    Longmont
  266. work stand
    $140
    Longmont
  267. 2026 New Schwalbe DH/enduro tires
    $180