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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
FUJI 29er full suspension MTB M size $899.0 1 bid 1 hour 38 minutes
Folding Bike- KHS Mocha - SILVER $187.99 2 bids 2 hours 51 minutes
2011 Felt Mountain Bike Small (Lightly Used) $284.0 1 bid 5 hours 19 minutes
PINARELLO F10 DOGMA TOUR JERSEY NEW WITH TAGS - XL 40 inch chest approx RARE $45.0 1 bid 7 hours 26 minutes
PINARELLO F10 DOGMA TOUR MEN BIB SHORTS NEW WITH TAGS - MEDIUM - RARE $45.0 1 bid 7 hours 33 minutes
Dolomite Mens Fat Tire Mountain Bike, 26-Inch Wheels, 4-Inch Wide Navy Blue $325.0 1 bid 9 hours 44 minutes
GRAVITY. AVENUE $46.0 4 bids 9 hours 51 minutes
2002 Specialized Enduro Expert FSR Frame with Fox Float RL Racing Shox. $65.0 7 bids 10 hours 23 minutes
2019 Giant Defy Advanced 2 carbon medium large Road Bike- GREAT CONDITION! $1525.0 6 bids 11 hours 17 minutes
Raleigh SC-30 Hybrid Comfort Bike $175.0 1 bid 12 hours 19 minutes
Cannondale Scalpel mountain bike ..small $1975.0 6 bids 12 hours 58 minutes
SE BIG FLYER 29 $605.0 2 bids 12 hours 59 minutes
Mountain bike (BRAND NEW) 4 DOUBLE wall rims, shifter set, rebound fork, skewers $126.0 1 bid 13 hours 16 minutes
1981 Fuji Royale Road Bike Small 54m 441 Lugged Steel . $89.99 1 bid 13 hours 22 minutes
2022 TREK MARLIN 8 SIZE M /L Red MOUNTAIN BIKE Never Ridden Orig Box TUBLESS $860.0 31 bids 13 hours 52 minutes
Trek Emonda ALR 56 Purple Flip $1100.0 4 bids 14 hours 26 minutes
Redline proline expert bmx bike $249.0 1 bid 14 hours 34 minutes
Diamondback Wildwood $106.0 1 bid 14 hours 54 minutes
Giant Trance Advanced Pro 29 1 Swingarm-2020 $152.5 2 bids 15 hours 6 minutes
Gt Performer Bmx Bike, Mid School 1990s $162.5 11 bids 15 hours 14 minutes
BMC Teammachine SLR01 Frameset - 51cm RIM BRAKE $1299.0 1 bid 15 hours 17 minutes
Specialized - Stumpjumper Evo $1000.0 1 bid 15 hours 34 minutes
specialized s works tarmac sl5 Peter Sagan $4500.0 3 bids 16 hours 7 minutes
Mongoose Villain Pro BMX 1999.freestyle. $450.0 1 bid 16 hours 7 minutes
20" Mongoose Rebel Bike Bicycle Steel Freestyle Frame Boy's BMX~ Used $95.0 5 bids 16 hours 16 minutes
2016 Lapierre Zesty AM 327 Womens Mtb $950.0 1 bid 16 hours 21 minutes
Giant Trinity Composite 2 $1179.0 3 bids 16 hours 36 minutes
Specialized Langster 58cm Great condition $475.0 1 bid 17 hours 2 minutes
ROADMASTER Granite Peak 26 inch Mountain Bike for Men - Black $99.0 1 bid 17 hours 47 minutes
Cannondale - SuperSix - HI MOD Carbon Road Bike - 52cm - Ultra Lightweight $1697.0 1 bid 18 hours 15 minutes
Giant Cypress DX Bicycle LG $400.0 1 bid 18 hours 42 minutes
1999 Klein Mantra Medium Frame $300.0 1 bid 18 hours 44 minutes
Trek Precaliber " Frame Bicycle *Local Pickup Only* $49.99 1 bid 19 hours 9 minutes
Cannondale Lefty Mountain Bike F29 Size Large Hardtail $820.0 7 bids 19 hours 32 minutes
2003 Merlin Road Bike 56cm $860.0 10 bids 19 hours 40 minutes
Brompton raw lacquer M6L 2014 folding bike , good condition , World shipping. $1320.0 80 bids 19 hours 50 minutes
Btompton M2L blue_turkish/blue 2017 folding bike , good condition , World shippi $850.0 84 bids 19 hours 59 minutes
2018 Giant Anthem Advanced Pro 29 1 Mountain Bike Medium Carbon $2199.0 1 bid 20 hours 8 minutes
Dahon Mariner 20 inch Folding Bike $259.0 2 bids 20 hours 18 minutes
diamondback hanjo terro medium gravel/All-road bike $300.0 1 bid 20 hours 49 minutes
15" Kids' Mountain Bike $1.0 1 bid 21 hours 1 minute
2019 Trek Emonda SL6 58 Carbon Road Bike. Upgraded Bontrager aero wheels $2500.0 1 bid 21 hours 27 minutes
SE Racing Vans Edition Big Ripper “29”. Rare! Low Number! Collectors Item! #vans $1451.0 15 bids 21 hours 39 minutes
2021 Giant Revolt 2 Gravel bike frame Concrete Gray Large Excellent Condition $599.95 1 bid 21 hours 52 minutes
carbon frame 54 mm trek madone 5.2 for repair $9.99 1 bid 22 hours 1 minute
100% Cool Townie/Commuter ~53cm; Dura Ace, Paul Comp, Thomson, Nitto+, Chico CA $255.0 6 bids 22 hours 10 minutes
Black and orange BMX bike $95.0 2 bids 22 hours 15 minutes
20in 7 Speed City Folding Compact Suspension Bike Bicycle Urban Commuters 2021 $93.56 60 bids 22 hours 24 minutes
BMX Vintage Mongoose Competition Racing Frame Bike GREAT CONDITION $1498.98 1 bid 22 hours 43 minutes
bianchi road bike vintage $199.0 1 bid 22 hours 48 minutes