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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
2002 Cannondale CAAD 5 Stars And Stripes 9/11 Edition $350.0 1 bid 1 hour 26 minutes
Surly Steamroller Fixed Gear 56cm Black Used $360.0 3 bids 1 hour 28 minutes
intense bmx 24" cruser racer $320.0 1 bid 3 hours 35 minutes
Huffy Mountain Bike 18 Speed. 26 Inch Wheels. $71.0 2 bids 3 hours 45 minutes
2020 Specialized Stumpjumper Comp Alloy 27.5, upgraded tires, grips, and pedals $1800.0 2 bids 3 hours 46 minutes
Elliptigo M-SUB - 10 speed, aluminum, shimano deraileur, disc brakes, 2021 $800.0 1 bid 3 hours 54 minutes
2016 ROCKY MOUNTAIN BLIZZARD -50 ALUMINUM FAT BIKE (LG) - ROCK SHOX BLUTO, NR! $570.0 30 bids 4 hours 5 minutes
Vitus Energie XS Cyclocross Gravel Stan’s Grail SRAM Rival $1000.0 1 bid 5 hours 39 minutes
SPECIALIZED ROUBAIX SL4 SWORKS DISC Frame/Fork Size 58 $399.0 1 bid 6 hours 7 minutes
Huffy Nel Lusso 26" Women's Cruiser Bike - Blue (56579P7) $96.0 1 bid 6 hours 8 minutes
Specialized Epic Carbon Fiber Road Bike Bicycle 700c 60cm Leroica 11speed $340.0 7 bids 6 hours 17 minutes
specialized Tarmac SL4 S-Works Frame Set Size 56cm $610.0 6 bids 6 hours 22 minutes
2018 TREK CROCKETT 7 CX/GRAVEL BIKE (56CM) - SRAM FORCE 22, 19LBS, NO RESERVE $1195.0 55 bids 6 hours 36 minutes
specialized tarmac sl6 Size 56cm carbon black full build road bike $2200.0 1 bid 6 hours 52 minutes
Pinerallo Prince FX 51cm, Amazing ride $1750.0 1 bid 7 hours 11 minutes
2010 58cm Scott CR1 Pro Ultegra $399.0 1 bid 9 hours 33 minutes
specialized Tarmac Sworks SL5 Size 54cm DuraAce Roval CLX50 Praxis Carbon $2300.0 2 bids 9 hours 37 minutes
bmx bikes 20 inch used Cheap $150.0 1 bid 10 hours 26 minutes
Trek Domane AL 2 Disc $680.0 4 bids 10 hours 28 minutes
Specialized Demo $3999.0 1 bid 10 hours 35 minutes
Parlee Altum Rim Brake 2019 $1200.0 1 bid 10 hours 51 minutes
Surly Karate Monkey custom Large I9 Hydras! $1525.0 31 bids 11 hours 4 minutes
Dual Suspension Mountain Bike - Enduro Comp Specialized Frame W/ Rockshoxs. $157.5 3 bids 11 hours 20 minutes
Riese & Mulle Birdy folding bike 18in Yellow Folding Bikes , world shipping $305.0 52 bids 11 hours 58 minutes
NEW 2021 Scott Addict 30 Road Bike Small 52 Carbon Frame Disk Brakes Shimano $950.0 1 bid 12 hours 54 minutes
AVASTA 20" Kids Mountain Bikewith 6 Speeds Drivetrain,Suspension Fork $0.01 1 bid 17 hours 19 minutes
Gary fisher wahoo 19 ‘ 26 Wheels New Rebuild With Bontrager Seat Post 31.8 Bars $155.0 3 bids 18 hours 14 minutes
Scott spark 900 Tuned AXS $3450.0 52 bids 19 hours 2 minutes
2021 Polygon Siskiu T7 Dual Suspension Mountain Bike $1500.0 1 bid 1 day 22 minutes
Schwinn Women’s bicycle $126.0 1 bid 1 day 1 hour 49 minutes
27.5 V2100 Men's Mountain Bike, Black Provide a smooth and stylish riding $36.0 7 bids 1 day 1 hour 54 minutes
Lynskey R330 Titanium Road Bike XL Shimano Dura-Ace Used 2010 $1225.0 2 bids 1 day 4 hours 35 minutes
Giant TCR Advanced Composite LARGE, Reynolds Wheels 4iiii Power Meter R7000 11s $651.0 11 bids 1 day 4 hours 39 minutes
Specialized Roubaix SL2 $610.0 2 bids 1 day 4 hours 41 minutes
Cannondale Road Bike Saddle / Seat $20.0 1 bid 1 day 5 hours 31 minutes
Vilano 600URBANABLK 1 Speed Folding Bike $69.0 1 bid 1 day 6 hours 23 minutes
Backroads titanium road bike Shimano ultegra 10 Speed $222.5 20 bids 1 day 8 hours 28 minutes
2007 SE Racing Bikes OM Flyer 26 BMX Bike Frameset -no wheels/tires/chain $112.5 21 bids 1 day 11 hours 26 minutes
fuji bikes used 28 $131.35 3 bids 1 day 12 hours 50 minutes
Trek Madone Pro 6.5 series carbon 54cm Road bike $699.0 3 bids 2 days 3 hours 13 minutes
special edition Dr pepper boys bike $0.99 1 bid 2 days 3 hours 15 minutes
Mongoose Legion LXS 20" Freestyle BMX Bike - Red (M51809M50OSPC) $55.0 1 bid 2 days 4 hours 13 minutes
Cannondale Synapse 4 Road Bike 51cm Black/Silver Frame - Free US Shipping $498.0 1 bid 2 days 5 hours 23 minutes
26in Voodoo Wanga Ultimate Superlight Steel MTB Chris King Hubs Raceface Cranks $600.0 1 bid 2 days 5 hours 27 minutes
Specialized S-Works Tarmac SL6 $107.5 2 bids 2 days 5 hours 41 minutes
2016 BMC Speedfox 02 carbon Mountain bike - Size S $900.0 27 bids 2 days 6 hours 54 minutes
Proflex 856 1996 full suspension vintage mountain bike medium $20.0 1 bid 2 days 6 hours 54 minutes
Sram Force Axs Etap 12-fach Rear Derailleur Middle Cage 12 Speed Electronic New $61.0 12 bids 2 days 9 hours 29 minutes
Sram Force 1 DUB 12 Speed Crankset 40T 172.5 mm $30.0 4 bids 2 days 9 hours 30 minutes
2020 Canyon CF SLX Campagnolo EPS Size M $3550.0 19 bids 2 days 9 hours 37 minutes