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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
29 inch mountain bike $66.0 6 bids 2 hours 28 minutes
1982 trek 970 single track mountain bike all gears an brakes work great $153.0 5 bids 6 hours 21 minutes
INTENSE PRO XL Racing bmx bike 20” $450.0 1 bid 6 hours 33 minutes
DK Micro 18” $160.0 1 bid 6 hours 39 minutes
2019 meybo xl pro cliper $300.0 1 bid 7 hours 50 minutes
Cannondale Bad Boy 1, Excellent Condition, Very low miles $629.0 4 bids 8 hours 9 minutes
Dawes 2100 27 Speed Road Bike with Aerobar and 1 Up USA Trainer $24.95 1 bid 8 hours 19 minutes
Ultimate BEST Folding Recumbent Trike Bike Bicycle 3 Wheels $710.0 4 bids 8 hours 30 minutes
SANTA CRUZ HECKLER DISC SIZE M 17.5 Inch Frame . $178.5 9 bids 8 hours 32 minutes
2021 SE Bikes Big Flyer 29" Black Sparkle Brand New Still In BoxNever Assembled $632.0 15 bids 8 hours 38 minutes
Sun seeker eco delta recumbent trike bicycle $425.0 1 bid 8 hours 55 minutes
Trek Apha aluminum 54cm road bike sora tiagra $355.0 44 bids 9 hours 49 minutes
Framed Alaskan Full Carbon Fat Bike $1812.0 1 bid 10 hours 2 minutes
2015 Trek Marlin 5 mountain bike. PICKUP ONLY $280.0 1 bid 10 hours 18 minutes
(sm.) Cannondale Jekyll Mountain Bike -16” 26/2 SRAM D-7 deore $200.0 9 bids 10 hours 24 minutes
58c Salsa Campeon Carbon/aluminum Scandium Tubeset Dura Ace Loaded $260.0 8 bids 10 hours 26 minutes
(lg.) 20” Novara Aspen Mountain Bicycle 6o61 Aluminum $100.0 6 bids 10 hours 27 minutes
56c Orbea Onix Full CarbOn Road Bike Ultegra $600.0 24 bids 10 hours 28 minutes
63cm Trek 1000 Road Bike Alu. Lite $212.5 34 bids 10 hours 28 minutes
42c , Pinarello FP Zero 6061 Aluminum Road Bike 24x1 Tires $187.5 53 bids 10 hours 30 minutes
( Lg. ) Giant Tcr Full Carbon C-3 Road Bike 56c $393.0 25 bids 10 hours 31 minutes
24”tyres / 14.5” Scott Spark Mountain Bike tyres Full-suspension $305.0 18 bids 10 hours 31 minutes
58cm Felt Z-80 Superlite Road Bike Alu. $255.0 37 bids 10 hours 31 minutes
56cm. BMC Roadracer Road Bike Full Carbon - Orange/white $750.0 38 bids 10 hours 32 minutes
54c Fuji ACR 3. Roubaix Alu./high Modulus Carbon Road Bike $310.0 34 bids 10 hours 33 minutes
55cm Douglas Matrix Carbon Road Bike -remarkable -sought $700.0 44 bids 10 hours 33 minutes
46cm Kona Dew Plus Hybrid Bike Hydraulic Etrto M-20 -3x8 $5.5 4 bids 10 hours 34 minutes
( Med. ) Giant OCR-2 Road Bike Alu.tiagra/105 -0utstanding 50cm $91.0 13 bids 10 hours 34 minutes
RALEIGH TOKUL 2 Women's Aluminum Frame Trail Bike 27.5" - Size M $0.01 1 bid 10 hours 36 minutes
2020 Trek 820 WSD Bicycle $300.0 2 bids 10 hours 39 minutes
Trek 850 Mountain Track XL 22" Frame Chromoly $169.0 2 bids 11 hours 10 minutes
TREK FX 7.3 Aluminum Women's Road Bike - Red - 46cm $26.0 12 bids 12 hours 12 minutes
Fat tire mountain bicycle bike $190.5 11 bids 12 hours 40 minutes
Used 2013 Cervelo P2 Triathlon Bike 56cm $810.0 4 bids 12 hours 49 minutes
2020 Cannondale Jekyll Large MTB $2526.0 33 bids 14 hours 1 minute
Schwinn Loop Foldable Adult Bike $325.0 32 bids 14 hours 37 minutes
Redline 925 Single Speed Commuter Bike 20 Inch Steel Frame Flip-Flop Rear Wheel $31.0 2 bids 14 hours 43 minutes
Genesis 20 inch Men's Mountain Bike $10.0 1 bid 14 hours 44 minutes
2011 Cinelli Vigorelli Single Speed Bike 54cm Zipp 404/ Dura Ace Brake $520.0 25 bids 15 hours 32 minutes
ROADMASTER R3012WML 24 Inch Mountain Bike - Silver $38.0 1 bid 16 hours 5 minutes
nishiki pueblo mountain bike $75.0 1 bid 17 hours 18 minutes
Gravel/Cyclocross Bike 54cm NASHBAR Aluminum Frame Tubeless Gravel Tires $375.0 1 bid 17 hours 21 minutes
Black Dyno Roadster- Dyno Crousier Bicycle $228.5 4 bids 18 hours 1 minute
Schwinn Homegrown Factory Suspension XTR $81.0 2 bids 18 hours 41 minutes
Huffy 26in Trail Runner Full Suspension Mountain Bike $35.0 2 bids 19 hours 12 minutes
Miami sun blue adult tricycles 3 wheel bike adult $41.0 4 bids 19 hours 25 minutes
Bianchi Pista single speed/fixie 51 cm $206.5 3 bids 20 hours 25 minutes
‘82 E.T. Kuwahara ( The Original) $6250.0 1 bid 21 hours 4 minutes
Hyper Jet Fuel 26" BMX Bike - Multicolor (HYP-T26-2266) $200.0 1 bid 1 day 1 hour 48 minutes
Ridley Helium Carbon Road bike $980.0 1 bid 1 day 6 hours 1 minute