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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
Rivendell Bicycle Clem Smith Jr. Style H, 2018 size 52cm in Grilver Complete $1674.0 10 bids
17 minutes SE BIKES Blocks Flyer 26" Black Sparkle $800.0 1 bid 1 hour 53 minutes
DT Swiss ARC 1400 DiCut Road Front Wheel 700c Carbon Tubeless $157.5 19 bids 2 hours 9 minutes
Colnago Pista Track Bike Black $1000.0 6 bids 2 hours 18 minutes
Specialized S-Works Crux 2019 Ultegra Di2 56cm with extras $4000.0 1 bid 2 hours 18 minutes
Specialized Allez Sport E5 Road Bike 54cm Frame $455.0 1 bid 2 hours 26 minutes
Specialized S Works Tarmac SL6 49 cm Rim Brake, Roval wheel set & parts $4200.0 20 bids 3 hours 18 minutes
Mavic Crossmax ST UST Mountain Rear Wheel 29" Aluminum Tubeless Shimano 11spd $8.5 6 bids 3 hours 31 minutes
Klein Attitude mountain Bike X/L $535.0 8 bids 3 hours 50 minutes
Cannondale CAAD 8 Road Bike 54cm $560.0 3 bids 4 hours 12 minutes
Ridley Helium SLX Carbon Ultegra Di2 Road Bike - 2019 Large /52638/ $935.0 20 bids 4 hours 18 minutes
Schwinn Road Bike Great Shape, $71.0 2 bids 4 hours 51 minutes
2019 Specialized Demo 8 Long $2200.0 1 bid 5 hours 2 minutes
WTB STp i25 TCS Mountain Rear Wheel 27.5" Aluminum Tubeless $0.99 1 bid 5 hours 3 minutes
Mavic Cosmic Elite UST Mountain Wheelset 29" Aluminum Tubeless $71.0 15 bids 5 hours 18 minutes
Davidson Impulse Handbuilt Lugged Steel Road Bike $350.0 1 bid 5 hours 21 minutes
Niner Road Wheelset 700c Aluminum Clincher $15.5 3 bids 5 hours 28 minutes
Niner Aluminum Road Wheelset 700c Clincher $3.25 3 bids 5 hours 33 minutes
Santa Cruz 5010 C medium $2700.0 16 bids 5 hours 34 minutes
Strider pedal kit for 14" bike PPEDAL KIT-14-US Brand New still in box $17.0 1 bid 5 hours 39 minutes
SUNringle Duroc 45 Mountain Wheelset 27.5" Aluminum Tubeless Boost $2.25 2 bids 5 hours 49 minutes
Stan's NoTubes ARCH MK3 Mountain Wheelset 29" Aluminum Tubeless $48.0 11 bids 5 hours 53 minutes
Roval Travers Mountain Rear Wheel 27.5" Aluminum Tubeless SRAM XD $3.25 3 bids 6 hours 31 minutes
Surly Long Haul Trucker 58cm $770.0 13 bids 6 hours 36 minutes
Cervelo S5 S-Series Rim Brake Carbon Frameset 56cm 700c Black/Red 2016 $1175.0 53 bids 6 hours 54 minutes
Domane+ ALR New MODEL 1049349 $1175.0 21 bids 7 hours 5 minutes
Bontrager Aura 5 Road Wheelset 700c Carbon Clincher Shimano 10 Speed $255.0 8 bids 7 hours 6 minutes
Mavic XA Mountain Front Wheel 29" Aluminum Tubeless $3.25 4 bids 7 hours 8 minutes
Mongoose Grudge BMX Freestyle Bike Single Speed 26 Inch Wheels boys red $120.0 1 bid 7 hours 17 minutes
Specialized S-Works Shiv Triathlon / TT Bike (Medium / 55cm) $3100.0 3 bids 7 hours 36 minutes
Specialized Stout Mountain Wheelset 27.5" Aluminum Tubeless Boost SRAM XD $93.0 21 bids 7 hours 45 minutes
Fulcrum Racing 1 Road Wheelset 700c Aluminum Clincher Shimano 10 Speed $38.0 13 bids 7 hours 47 minutes
Cannondale CAAD 10 Road Bike Hard To Find 44cm Shimano 105 $525.0 1 bid 9 hours 8 minutes
Vintage 02 Mongoose KO Team Issue 20" Freestyle BMX Mid School Old Skool Bike $89.99 1 bid 9 hours 22 minutes
2021 Specialized Diverge Expert Carbon Wheels Gravel Bike (GRX DI2) 56, $4350.0 35 bids 9 hours 50 minutes
Lynskey Custom titanium Single Speed Chris King Reynolds Carbon Fox Formula R1 $1200.0 1 bid 10 hours 8 minutes
Santa Cruz Blur Small XTR XT XO Fox Maverick Seatpost Magura Brakes DT Swiss $660.0 4 bids 10 hours 8 minutes
2011 Giant Defy Ultegra/105 Road Bike Medium riders 5'7" to 5'11" $265.0 42 bids 10 hours 23 minutes
99' CANNONDALE SUPER V 700SX (Lefty, full suspension) $500.0 1 bid 10 hours 33 minutes
Powerlite Old School Vintages Bike Junior size jr Dotek kids bicycle bmx $180.27 5 bids 10 hours 37 minutes
Red 20inch Adult Tricycle 7 Speed 3-Wheel Adult Bicycle Trike w/Basket & Tools $209.0 1 bid 10 hours 37 minutes
Fuji SUN CREST SX....BIKE pick up only $99.95 1 bid 10 hours 51 minutes
TREK Marlin 6 / Aluminum Mountain Bike / XR2 27.5" Tires & Disc Hydraulic Brakes $406.0 6 bids 11 hours 30 minutes
Pivot MTB 5.5 rear Fox Dpx2 Shock. 7.875 X 2.0 $107.5 3 bids 11 hours 54 minutes
Funko Pop Games: Fallout 76 - Mothman One-Size $7.5 3 bids 12 hours 5 minutes
Specialized Rockhopper mans mountain bike mens large blue bicycle rockshox fork $132.0 5 bids 15 hours 28 minutes
specialized hardrock mountain bike 2019 $357.0 1 bid 16 hours 17 minutes
Trek 930 Bike singletrack rare mountain bicycle single track $73.0 3 bids 17 hours 36 minutes
Giant Shimano System Bicycle Local Pick Up $60.0 1 bid 17 hours 38 minutes
Schwinn Hitchhiker Tandem Bike Attachment Tag-A-Long Steel USA 20" Wheel $161.0 1 bid 18 hours 11 minutes