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eBay
Popularity: 
Based on our research, we found eBay to be the largest and most popular online bike auction site.
The website has lots of bicycles on auction every day. You can filter the results by frame size, such as 17 inches, 19 inches, 20 inches, 26 inches, large, medium, small, and x-large. You can also filter the bike auctions by type, such as BMX bike, cruiser, gravel bike, hybrid bike, kids' bike, mountain bike, road bike, and Time Trial/Triathlon Bike. You can even filter the results by material, such as alloy, aluminum, aluminum alloy, carbon fiber, chromoly, steel, and titanium.
Popular brands of bikes on auction includes Cannondale, Diamondback, Giant, GT, Santa Cruz, Schwinn, Specialized, and Trek.
shopgoodwill.com
Popularity: 
ShopGoodWill offers a good number of bikes for online auctions.
Examples of bikes auctioned included men's road bike, Zize bike, Three Olives battery operated commuter bike, ReBike 2600, Cannondale quick bike, Trek bike, and blue specialized Vita Sport 8 speed bike.
PropertyRoom.com
Popularity:
Property Room offers many bicycles for online auctions.
Categories include beach bikes, BMX bikes, mountain bikes, road & racing bikes, and more. Examples of auctioned bikes are Syncros Aspect 740 Hybrid Bike, Giant Cypress City Bike, GMC Denali Road Bike, Schwinn Rivel Mountain Bike, Giant ATX Mountain Bike, Trek Marlins Mountain Bike, Diamon Back Sorrento Hybrid Bike, Specialized Rip Rock Mountain Bike, Citizen Milan City Bike, and Raleigh Record City Bike.
liveauctioneers.com
Popularity:
LiveAuctioneers.com is an online auction platform with many buyers and sellers. You often can find some bikes to bid for.
Because bicycles are offered by various buyers, each buyer has different shipping policies.
Live Auctioneers has a feedback system. So, before you bid for a bike, you may want to check the reviewers of other buyers to know the reputation of the auctioneer.
GoVDeals
Popularity: 
GovDeals often offers some bikes for auction.
The bikes are often offered by government or educational agencies. They don't provide shipping service. So, the winner of a bike auction needs to either pick up the bicycle personally or arrange a third-party service provider to pick up, package, and ship it.
Liquidation.com
Popularity:
Liquidation.com often offers a small number of bike auctions online.
The auctions are for business buyers. Bicycles are offered in "lot", and each lot includes 5, 6, or more bikes.
publicsurplus.com
Popularity:
You can often find some bicycles for auctions on Public Surplus.
The bikes are offered by various government agencies. They don't provide shipping services. You need to pick up the bike yourself or arrange a third-party to remove it, if you win the bid.
Popular Bike Auctions on eBay Ending Soon
Giant NRS XTC 2 Full Suspension Mountain Bike Rock Shox Deore Mavic $536.0 23 bids
3 minutes Vintage Jeep Downhill Bike $152.5 10 bids
49 minutes Vintage Cannondale F600 Caad2 Stem $0.99 1 bid
50 minutes Trek Mountain Bike WAHOO *A Gary Fisher Collection* $405.0 27 bids 1 hour 49 minutes
Surly Krampus front fork xl $112.5 4 bids 1 hour 57 minutes
Zullo, Campagnolo Mirage, Columbus Gara Steel Tubing $167.5 15 bids 2 hours 9 minutes
Murray Baha Street Cycle $40.0 1 bid 2 hours 29 minutes
Specialized S-Works Venge Etixx Quick Step, Dura Ace, 56cm $2500.0 1 bid 2 hours 30 minutes
Cannondale Synapse $2751.0 35 bids 2 hours 50 minutes
Cannondale CARBON Lefty fork ( OLIVER ) make you bike into a GRAVEL BIKE 1 1/8 $355.0 5 bids 2 hours 51 minutes
Giant Talon 3 2018 Large Men's 27.5 Mountain Bike $403.0 1 bid 2 hours 57 minutes
Giant Liv Avail Women’s Road Bike $510.0 32 bids 3 hours 9 minutes
Nishiki Sport Bike, 10 speed $52.0 3 bids 3 hours 43 minutes
Classic Rare Dyno Glide Deluxe 26" Beach Bicycle Cruiser ladies retro mod $139.0 1 bid 3 hours 50 minutes
Vitnage Bianchi Campione D' Italia Road Bike, Ambrosio 19 extra elite Rims 80's? $99.99 1 bid 3 hours 53 minutes
Trek Madone SLR 6 DISC Ultegra W/ Bontrager Comp 5 Wheels 58cm $5800.0 24 bids 4 hours 14 minutes
New fully assembled boys bmx style bike with training wheels Ready To ride $30.0 1 bid 4 hours 20 minutes
Jamis Sutter Home Xenith Pro Road Bike 54cm $910.0 19 bids 4 hours 50 minutes
Pivot Les Hardtail Mountain Bike - XL 29 $1101.0 7 bids 5 hours 5 minutes
Planet X Track Bike Fixed Gear Fixie $785.0 3 bids 5 hours 35 minutes
2019 Salsa Cutthroat Rival - Small $2650.0 6 bids 5 hours 40 minutes
2015 Trek Domane 2.3 Road Bike 52cm Aluminum Shimano 105 5800 $363.05 45 bids 5 hours 59 minutes
2013 Cannondale F29 2 Mountain Bike Large 29" Aluminum SRAM X0 10-Speed $650.0 39 bids 6 hours
2014 Cannondale Slice 5 Triathlon/TT Bike 58cm Carbon Shimano 105 5700 $147.5 43 bids 6 hours 1 minute
2019 Specialized Epic Comp Carbon Mountain Bike Large 29" SRAM NX Eagle $1210.0 52 bids 6 hours 2 minutes
2016 Specialized Allez Sport Road Bike 52cm Aluminum Shimano Sora 3500 $405.0 23 bids 6 hours 3 minutes
2017 Cannondale CAADX Apex 1 Cyclocross Bike 51cm Aluminum $153.5 28 bids 6 hours 4 minutes
2003 Surly Cross-Check Cyclocross Bike 60cm Steel Shimano Tiagra 4400 $305.0 22 bids 6 hours 5 minutes
2013 Giant Trance X 29er 1 Mountain Bike Large Aluminum SRAM 2x10-Speed $631.0 34 bids 6 hours 6 minutes
2007 Serotta Colorado III Road Bike 62cm Steel Shimano Ultegra 6500 $207.5 12 bids 6 hours 7 minutes
Haro Extreme Full Suspension Mountain Bike 19.5" 7005 Aluminum EXC NO RESERVE $113.0 19 bids 6 hours 14 minutes
Fuji Ace Race Design 58cm Road Bike TT Profile Design, Sora, Vuelta $400.0 1 bid 6 hours 39 minutes
Cannondale R1000 Aero Bike 56cm $475.0 2 bids 7 hours 2 minutes
Kona Major Jake $400.0 1 bid 7 hours 30 minutes
🔥Trek Marlin 5 Small Mountain Bike in New Condition! 27.5 Wheels & Disc Brks!👍 $610.0 4 bids 8 hours 45 minutes
Trek MADONE 6.2 Full Dura Ace 62cm $1525.0 3 bids 9 hours 26 minutes
Public C7 Bicycle Women Commuter Dutch Step $299.0 1 bid 9 hours 41 minutes
Vintage Specialized 1993 Mtn Bike HardRock $51.0 7 bids 10 hours 6 minutes
Vintage 1992 Cannondale R-400 3.0 Aluminum road bike Classic Cannondale $275.0 1 bid 16 hours 55 minutes
Montague Crosstown Full Size Folding Road Bicycle $148.0 1 bid 18 hours 54 minutes
2018 Trek Top Fuel 9.8 - Size M/L - Excellent Condition; Will Ship, you pay $2590.0 1 bid 18 hours 57 minutes
PINARELLO Dogma Disc Dura Ace Di2 CF Stages Power Meter Roval Rapide 32 $1280.0 41 bids 19 hours 8 minutes
Trek Mountain Bike, 29er Shimano, RockShox, 29 Inch Wheels, Bontrager, Premium $635.0 4 bids 19 hours 43 minutes
Fixie Inc, Pure Blood (STEEL) XL/59cm $20.5 2 bids 21 hours 30 minutes
Mountain bike for sale used, green and black 8speed $450.0 1 bid 22 hours 28 minutes
Cannondale Supersix road bike 60 cm $1250.0 1 bid 22 hours 37 minutes
Linus 3i Dutch Bike 3 speed great condition $350.0 1 bid 1 day 8 minutes
Orbea Alma 29 Carbon Mountain Bike $810.0 56 bids 1 day 10 minutes
NOS GT POWER SERIES CRANK 180 OPC CRO-MO OLD SCHOOL MID DYNO HARO DK MONGOOSE $24.5 8 bids 1 day 33 minutes
FUJI SILHOUETTE WSD Women's Carbon Road bike $800.0 1 bid 1 day 43 minutes