21 speed mountain bike
21 speed mountain bike for sale on Ireland's largest auction and classifieds sites
Browse 45 21 speed mountain bike listings currently in our index. Prices range from £6.49 to £291.89, with an average of £192.45. Whether you are hunting for a bargain or looking for a top-spec model, the selection below covers all price points — new, used and refurbished. More about 21 speed mountain bike →
Budget picks — under £180
Chain tool required • You require less • Need shorten number - Free postage - New and Used
Specifications color black • Bike material carbon • Synthetic leather metal - Free postage - New and Used
This folding mountain • Bike wheels both • Men women riders - Free postage - New and Used
Foldable yes suitable • Adults teens folding • Bike speed perfect - Free postage - New and Used
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Conquer ride aili • Mountain bike engineered • Adventure turn heads - Free postage - New and Used
Bike type adult • Speed gears rear • Shimano derailleur easy - Free postage - New and Used
Wheel 27.5 gears • Speed brakes mechanical • Frame medium suspension - Free postage - New and Used
Smooth riding any • Weather rainy windy • Speeds front suspension - Free postage - New and Used
- Free postage - New and Used
Specifications color black • Bike material carbon • Synthetic leather metal - Free postage - New and Used
Specifications color black • Bike material carbon • Synthetic leather metal - Free postage - New and Used
Bicycle accesories basis • Componentry vibrant graphics • Gives unique look - Free postage - New and Used
Basis recruits latest • Junior mountain bike • Bolt simplistic yet - Free postage - New and Used
Can help you • Double disc brake • Description riding excellent - Free postage - New and Used
Chainset 170mm crank • 42x34x24t chainrings get • Touch fork travel - Free postage - New and Used
Mid-range — £190 to £210
Assemble guidance this • Bike arrives assembled • Front wheel pedals - Free postage - New and Used
Maximum load capacity • Bicycle 330 lbs • Which suitable daily - Free postage - New and Used
Maximum load capacity • Bicycle 330 lbs • Which suitable daily - Free postage - New and Used
Fine tune your • Adjustable handlebars seat • Height too colour - Free postage - New and Used
Fine tune your • Adjustable handlebars seat • Height too colour - Free postage - New and Used
Fine tune your • Adjustable handlebars seat • Height too colour - Free postage - New and Used
Assemble guidance this • Bike arrives assembled • Front wheel pedals - Free postage - New and Used
Maximum load capacity • Bicycle 330 lbs • Which suitable daily - Free postage - New and Used
Maximum load capacity • Bicycle 330 lbs • Which suitable daily - Free postage - New and Used
Maximum load capacity • Bicycle 330 lbs • Which suitable daily - Free postage - New and Used
Introducing salcano excel • Rugged adventurous ride • Ignite spirit exploration - Free postage - New and Used
Introducing salcano excel • Rugged adventurous ride • Ignite spirit exploration - Free postage - New and Used
Unique design bikes • Can not only • Shine their inner - Free postage - New and Used
Assemble guidance this • Bike arrives assembled • Front wheel pedals - Free postage - New and Used
Distance from handlebars • Seat ground 86cm • 97cm - Free postage - New and Used
Premium — over £210
High quality steel • Assemble guidance this • Bike arrives assembled - Free postage - New and Used
High quality steel • Assemble guidance this • Bike arrives assembled - Free postage - New and Used
High quality steel • Assemble guidance this • Bike arrives assembled - Free postage - New and Used
Assemble guidance this • Bike arrives assembled • Front wheel pedals - Free postage - New and Used
Fine tune your • Adjustable handlebars seat • Height too mtb - Free postage - New and Used
Spoke foldable design • Mountain bike can • Opened closed seconds - Free postage - New and Used
Unique design bikes • Can not only • Shine their inner - Free postage - New and Used
Assemble guidance this • Bike arrives assembled • Front wheel pedals - Free postage - New and Used
Constructed from lightweight • Aluminum licorne bike • Effect features front - Free postage - New and Used
Zoom front suspension • Forks has speed • Gears twist grip - Free postage - New and Used
Spoke foldable design • Mountain bike can • Opened closed seconds - Free postage - New and Used
Constructed from lightweight • Aluminum licorne bike • Effect features front - Free postage - New and Used
High quality shimano • Gears this bike • Ensures smooth efficient - Free postage - New and Used
Xids mountain bicycle • Speed high quality • Bike daily use - Free postage - New and Used
Xids mountain bicycle • Speed high quality • Bike daily use - Free postage - New and Used
Try this: 24 trials bike | 26 bicycle rims | 26 bmx bikes | 26 mtb frame | 29er bikes | 29er mountain bike frame | 3 wheel bike | 3 wheel bikes | 3 wheel trike | 4iiii power meter
🔥 Best eBay deals on 21 speed mountain bike
See all listings on eBay →These 45 listings for 21 speed mountain bike are the lowest-priced items currently in our index. Prices are sorted ascending so you can quickly gauge the market before going further.
21 / 24 SPEED MOUNTAIN BIKE
Chain tool required • You require less • Need shorten number
£6
Mens Mountain Bike Mountaineer
Specifications color black • Bike material carbon • Synthetic leather metal
£109
Folding Mountain Bike Full
This folding mountain • Bike wheels both • Men women riders
£111
Everything you need to know about 21 speed mountain bike
Whether you are looking for a brand-new or second-hand 21 speed mountain bike, eBay offers one of the largest selections available online. With 45 active listings at the time of this page's last update, you have plenty of choice across different conditions, sellers and price points. The cheapest option currently starts at £6.49, while premium listings can reach £291.89 — giving you a wide budget spread to work with. The average price of £192.45 can serve as a useful benchmark: listings below this tend to be used or auction-style, while those above often include extra accessories, warranties, or are sold by professional sellers with high feedback scores. Always check the seller's feedback rating and return policy before committing to a purchase. If you need the item quickly, filter by "Buy It Now" to avoid the uncertainty of auctions. For used items, look closely at the condition description and photos — terms like "good", "very good" and "like new" can mean very different things depending on the seller.