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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
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