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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 Cross 1.3 Gravel Bike 54cm Medium Retail $1800 $670.0 58 bids
41 minutes 2016 Fuji Feather, Single Speed/Fixie, Dark Green, 54 cm, please see description $400.0 1 bid 1 hour 8 minutes
No Reserve Standard Byke co Shaman OX Standard Bikes Primo Profile Flatland FBM $440.0 14 bids 1 hour 28 minutes
Scott Addict RC 15 49 XS $5200.0 1 bid 2 hours 16 minutes
2019 Canyon Spectral Al WMN 5.0 Mountain bike - Shimano SLX - Size Small $1425.0 87 bids 2 hours 38 minutes
Specialized Allez Elite - 54cm $360.0 3 bids 3 hours 4 minutes
2022 Trek M $565.0 3 bids 3 hours 15 minutes
Moots MootoX 29er Titanium Hardtail $3050.0 32 bids 3 hours 15 minutes
Old school BMX 25" Cruiser $168.5 5 bids 3 hours 16 minutes
pinarello dogma xc **IS FULL CARBON **** $1075.0 4 bids 3 hours 22 minutes
2011 Cannondale Slice 5 Triathlon $790.0 19 bids 3 hours 35 minutes
Scott bicycle size medium gun metal grey color $1275.0 46 bids 4 hours 8 minutes
Takara 700C Takara Kabuto Road Bike Black and yellow PICK UP ONLY $52.0 2 bids 4 hours 22 minutes
Windsor The Hour Bike 4130 Chromoly Steel PICK UP ONLY $50.0 1 bid 4 hours 22 minutes
Bassett BMX $750.0 10 bids 6 hours 1 minute
Vintage Trek - Single Speed $195.32 1 bid 6 hours 34 minutes
Moots YBB 20” Large $2150.0 2 bids 11 hours 27 minutes
2015 Trek Alpha 1.5 Road Bike 58cm Tiagra $570.0 15 bids 14 hours
Sun EZ-3 USX Recumbent Tricycle 21 Speed, Disc Brakes, Suspension 20” Tires, Use $153.5 13 bids 14 hours 43 minutes
Ultimate BEST Folding Recumbent Trike Bike Bicycle 3 Wheels $500.0 1 bid 15 hours 58 minutes
2020 Salsa Cutthroat Carbon Apex 1 Gravel Bike - 56cm Frame Size $2383.0 8 bids 16 hours 49 minutes
2017 Giant TCR ADVANCED PRO 1 $1619.0 3 bids 17 hours 10 minutes
squid mountain bike frame f off johnny large $156.5 2 bids 17 hours 44 minutes
Marin Rift Zone 3 medium 29 Mountain Bike Ridden Once $510.0 64 bids 18 hours 43 minutes
Nordest Bardino Med/large steel hardtail mountain bike custom $445.0 36 bids 18 hours 49 minutes
Trek Bike Frame 21" / 53.5 cm. SR Slntour $0.99 2 bids 20 hours 18 minutes
TREK MADONE SL7 500 ETAP CARBON ROAD BIKE 54CM $5800.0 38 bids 21 hours 8 minutes
SEVEN Cycles titanium Cafe Racer 55cm $1009.0 2 bids 21 hours 33 minutes
2020 BIANCHI ARIA ROAD BIKE 57 CM ULTEGRA Di2 GROUP SET, CARBON. LET'S DISCUSS. $2225.0 26 bids 21 hours 41 minutes
Focus Mares CX CycloCross Carbon Fibre Bike 52cm $414.0 3 bids 21 hours 54 minutes
1987? Schwinn World Road Bike 53cm Frame & Forks Only! - Dark Grey $25.0 1 bid 22 hours 26 minutes
Purple 1993 "Air Friday" Folding Travel Bike by BIKE FRIDAY w/ TITANIUM beam $665.0 3 bids 22 hours 43 minutes
Cannondale System Six Team SI 48cm Road Bike w/Dura Ace & Ultegra components $575.0 1 bid 1 day 42 minutes
Schwinn Predator Freestyle BMX 1983 Design Haro GT Redline $237.5 30 bids 1 day 1 hour 8 minutes
Surly Bike - Midnight Special Bicycle – 54cm $890.0 4 bids 1 day 1 hour 12 minutes
2014 Orbea Avant 105 Carbon Fiber Road Bike 53cm $710.0 46 bids 1 day 1 hour 45 minutes
Free Agent Champ BMX Bike 20" Wheel $5.5 5 bids 1 day 1 hour 54 minutes
M 700c Focus City Bike With Disk Brakes $200.0 1 bid 1 day 2 hours 5 minutes
20” BMX Bike Chrome Handle Bars. ACE bikes $2.99 1 bid 1 day 2 hours 12 minutes
Surly Straggler Minty 56cm W/Extras $1034.0 3 bids 1 day 2 hours 53 minutes
Trek Remedy 7 All Mountain Trail Bike Low Miles Excellent Rock Shox Lyric Fox $750.0 1 bid 1 day 3 hours 47 minutes
Yaqui Mariola 54cm Scandium TT Frame/Carbon Fork, 700c, Oval handle Bars, Dura $100.0 1 bid 1 day 4 hours 28 minutes
Santa Cruz Bronson Carbin mountain bike large $1547.0 3 bids 1 day 5 hours 31 minutes
trek 800 mountain bike $125.0 1 bid 1 day 14 hours 58 minutes
Cannondale CAAD12 Shimano 105 56 cm $829.0 4 bids 1 day 15 hours 8 minutes
Huffy 26-Inch Good Vibrations Cruiser Men's Bike, NEW-IN-BOX $89.75 1 bid 1 day 16 hours 51 minutes
2017 Cannondale Synapse Carbon Disc Road Bike Shimano 105 61cm $1100.0 1 bid 1 day 17 hours 49 minutes
2021 Santa Cruz Hightower CC XL Frame Ember USED $2000.0 1 bid 1 day 18 hours 32 minutes
schwinn bicycle $100.0 1 bid 1 day 18 hours 58 minutes
TWO (His AND Hers?) Trek 7200fx Hybrid Bikes $108.02 5 bids 1 day 20 hours 18 minutes