21 speed mountain bike
21 speed mountain bike for sale on Ireland's largest auction and classifieds sites
Mens mountain bike mountaineer - mens, - £163.10
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
5 29inch mountain - 24/26/27.5/29inch, - £209.90
Assemble guidance this • Bike arrives assembled • Front wheel pedals - Free postage - New and Used
Assemble guidance this • Bike arrives assembled • Front wheel pedals - Free postage - New and Used
Speed city hybrid bike - city, - £241.30
City bicycle smooth • Stylish built urban • Rides front suspension - Free postage - New and Used
City bicycle smooth • Stylish built urban • Rides front suspension - Free postage - New and Used
Inch mountain bike speed - mountain, - £189.90
This bike arrives • Assembled you need • Assemble front wheel - Free postage - New and Used
This bike arrives • Assembled you need • Assemble front wheel - Free postage - New and Used
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Speed mountain bike - 21, - £6.79
Chain tool required • You need less • Shorten number links - Free postage - New and Used
Chain tool required • You need less • Shorten number links - Free postage - New and Used
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48 listings · from £6.49 · avg £175.11
⚠️ These listings were last updated more than 8 days ago.
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Browse 48 21 speed mountain bike listings currently in our index. Prices range from £6.49 to £349.99, with an average of £175.11. 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 →
Mens mountain bike - mountain, mountaineer - £163.10
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
Mens mountain bike mountaineer - mountain, - £163.10
Can help you • Double disc brake • Description riding excellent - Free postage - New and Used
Can help you • Double disc brake • Description riding excellent - Free postage - New and Used
Speed folding mountain bike - 21-speed, - £163.10
Specifications color black • Style modern braking • Dual disc brake - Free postage - New and Used
Specifications color black • Style modern braking • Dual disc brake - Free postage - New and Used
Giant revel mountain bike - revel, - £32.94
Mountain bike • Features durable aluminium • Frame medium perfect - Free postage - New and Used
Mountain bike • Features durable aluminium • Frame medium perfect - Free postage - New and Used
Adult mountain bike - adult, - £209.90
Assemble guidance this • Bike arrives assembled • Front wheel pedals - Free postage - New and Used
Assemble guidance this • Bike arrives assembled • Front wheel pedals - Free postage - New and Used
Aili mountain bike 21 - aili, - £179.00
Aili mountain bike • Front suspension mtb • Straighten handlebars speed - Free postage - New and Used
Aili mountain bike • Front suspension mtb • Straighten handlebars speed - Free postage - New and Used
Speed mountain bike - speed, - £6.49
Chain tool required • You require less • Need shorten number - Free postage - New and Used
Chain tool required • You require less • Need shorten number - Free postage - New and Used
Mountain bike 21 speed - 26“, - £219.90
Assemble guidance this • Bike arrives assembled • Front wheel pedals - Free postage - New and Used
Assemble guidance this • Bike arrives assembled • Front wheel pedals - Free postage - New and Used
Inch mountain bike - 21, speed - £199.99
Unique design bikes • Can not only • Shine their inner - Free postage - New and Used
Unique design bikes • Can not only • Shine their inner - Free postage - New and Used
Ammaco ridgeway hybrid - ridgeway, - £193.10
This ammaco ridgeway • Hybrid mountain bike • Sturdy versatile option - Free postage - New and Used
This ammaco ridgeway • Hybrid mountain bike • Sturdy versatile option - Free postage - New and Used
Shimano folding mountain bike - shimano, - £199.90
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
Arden ridge speed - speed, mens - £189.99
Fine tune your • Adjustable handlebars seat • Height too snob - Free postage - New and Used
Fine tune your • Adjustable handlebars seat • Height too snob - Free postage - New and Used
Speed mountain bike - 21, - £6.79
Chain tool required • You require less • Need shorten number - Free postage - New and Used
Chain tool required • You require less • Need shorten number - Free postage - New and Used
Arden ridge speed - 21, mens - £189.99
Fine tune your • Adjustable handlebars seat • Height too snob - Free postage - New and Used
Fine tune your • Adjustable handlebars seat • Height too snob - Free postage - New and Used
Folding mountain bike - mountain, - £229.99
Spoke foldable design • Mountain bike can • Opened closed seconds - Free postage - New and Used
Spoke foldable design • Mountain bike can • Opened closed seconds - Free postage - New and Used
Mens mountain bike - mens, mountaineer - £163.10
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
New inch bike mountain - new, 26 - £128.88
Foldable yes suitable • Adults teens folding • Bike speed perfect - Free postage - New and Used
Foldable yes suitable • Adults teens folding • Bike speed perfect - Free postage - New and Used
Ridge speed mens boys - mens, front - £209.99
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
Boss venom wheel - boss, 26" - £187.88
Chainwheel 170mm crank • 42x34x24t chainrings brakes • Fork suspension forks - Free postage - New and Used
Chainwheel 170mm crank • 42x34x24t chainrings brakes • Fork suspension forks - Free postage - New and Used
Carrera luna speed - carrera, - £146.30
Carrera luna speed • Mountain bike stylish • Versatile option cycling - Free postage - New and Used
Carrera luna speed • Mountain bike stylish • Versatile option cycling - Free postage - New and Used
5inch mountain bike 21 - 24-27.5inch, - £189.90
Unique design bikes • Can not only • Shine their inner - Free postage - New and Used
Unique design bikes • Can not only • Shine their inner - Free postage - New and Used
Inch mountain folding bike - 26, - £199.99
Inch mountain folding • Bike versatile durable • Adult bicycle off - Free postage - New and Used
Inch mountain folding • Bike versatile durable • Adult bicycle off - Free postage - New and Used
Inch adult mountain - 24-29, - £215.90
Assemble guidance this • Bike arrives assembled • Front wheel pedals - Free postage - New and Used
Assemble guidance this • Bike arrives assembled • Front wheel pedals - Free postage - New and Used
Mountain bike licorne guide - licorne, - £89.99
Licorne glide mountain • Bike new front • Inner tube full - Free postage - New and Used
Licorne glide mountain • Bike new front • Inner tube full - Free postage - New and Used
Shimano folding mountain bike - shimano, - £199.90
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
Python rock mountain bike - mountain, bike, - £103.66
Python rock mountain • Bike frame wheels • Speed trigger shift - Free postage - New and Used
Python rock mountain • Bike frame wheels • Speed trigger shift - Free postage - New and Used
Adult mountain bike front - adult, - £189.99
Assemble guidance this • Bike arrives assembled • Front wheel pedals - Free postage - New and Used
Assemble guidance this • Bike arrives assembled • Front wheel pedals - Free postage - New and Used
Jump kids mountain - 24", bike - £349.99
Shimano tourney ef500 • Speed front derailleur • Just 12.5kg easy - Free postage - New and Used
Shimano tourney ef500 • Speed front derailleur • Just 12.5kg easy - Free postage - New and Used
Coyote alpine hybrid mountain - hybrid, - £201.99
Alpine coyote all • New gents hybrid • Bicycle adults mountain - Free postage - New and Used
Alpine coyote all • New gents hybrid • Bicycle adults mountain - Free postage - New and Used
Mountain bike folding - 26", - £163.11
Riding excellent exercise • That can help • You keep healthy - Free postage - New and Used
Riding excellent exercise • That can help • You keep healthy - Free postage - New and Used
Folding mountain bike - folding, - £164.05
Riding excellent exercise • That can help • You keep healthy - Free postage - New and Used
Riding excellent exercise • That can help • You keep healthy - Free postage - New and Used
5 inch folding - 24/26/27.5, - £209.90
Spoke foldable design • Mountain bike can • Opened closed seconds - Free postage - New and Used
Spoke foldable design • Mountain bike can • Opened closed seconds - Free postage - New and Used
Inch mountain bike front - 27.5, - £207.99
Assemble guidance this • Bike arrives assembled • Front wheel pedals - Free postage - New and Used
Assemble guidance this • Bike arrives assembled • Front wheel pedals - Free postage - New and Used
Shimano folding mountain - shimano, - £209.90
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
Inch wheel adult mountain - inch, - £219.90
Adjustable seat allows • You ride long • Distances comfortably assemble - Free postage - New and Used
Adjustable seat allows • You ride long • Distances comfortably assemble - Free postage - New and Used
5 29inch mountain - 24/26/27.5/29inch, - £205.90
Assemble guidance this • Bike arrives assembled • Front wheel pedals - Free postage - New and Used
Assemble guidance this • Bike arrives assembled • Front wheel pedals - Free postage - New and Used
Folding mountain bike - 24"26", - £199.99
Spoke foldable design • Mountain bike can • Opened closed seconds - Free postage - New and Used
Spoke foldable design • Mountain bike can • Opened closed seconds - Free postage - New and Used
Speed folding mountain - 21-speed, - £144.11
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
Basis connect mountain - connect, - £190.99
Handlebars mtb style • Bicycle accesories gearing • Shimano speed rear - Free postage - New and Used
Handlebars mtb style • Bicycle accesories gearing • Shimano speed rear - Free postage - New and Used
Inch folding bike - &, 26 - £129.99
Foldable yes suitable • Adults teens folding • Bike speed full - Free postage - New and Used
Foldable yes suitable • Adults teens folding • Bike speed full - Free postage - New and Used
Full suspension - full, - £189.90
Front rear suspension • Perfect trail riding • Daily commuting weekend - Free postage - New and Used
Front rear suspension • Perfect trail riding • Daily commuting weekend - Free postage - New and Used
Mountain bike licorne - bike, guide - £142.14
Bought last dec • 11year old does • Not like used - Free postage - New and Used
Bought last dec • 11year old does • Not like used - Free postage - New and Used
Mountain bike licorne - mountain, - £291.59
Constructed from lightweight • Aluminum licorne bike • Effect features front - Free postage - New and Used
Constructed from lightweight • Aluminum licorne bike • Effect features front - 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 | 29er mtb frame | 29er wheelset | 3 wheel bike | 3 wheel bikes
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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 48 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 £349.99 — giving you a wide budget spread to work with. The average price of £175.11 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.