For Sale UK

21 speed mountain bike

4

21 speed mountain bike for sale on largest auction and classifieds sites

Home / Bicycles / 21 speed mountain bike refurbished & used for sale | For Sale UK
Aili mountain bike 21 - 26",

Aili mountain bike 21 - 26",

£159.00
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Mountain bike 21 speed - mountain,

Mountain bike 21 speed - mountain,

£157.99
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Inch mountain bike - 24, speed

Inch mountain bike - 24, speed

£189.90
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Brand new gemarn road - new,

Brand new gemarn road - new,

£132.58
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Mongoose switchback sport - sport, 26in

Mongoose switchback sport - sport, 26in

£73.50
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Blue specialised hardtail

Blue specialised hardtail

£156.70
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Muddyfox typhoon 26in - typhoon, 15in

Muddyfox typhoon 26in - typhoon, 15in

£50.00
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Trek mountain bike 26in - mountain,

Trek mountain bike 26in - mountain,

£156.70
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26in mountain bike - mountain,

26in mountain bike - mountain,

£172.30
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Ladies mountain bike

Ladies mountain bike

£156.70
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Mountain bike 21 speed - mountain,

Mountain bike 21 speed - mountain,

£159.99
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Rockrider 26in mountain bike - 26in, m

Rockrider 26in mountain bike - 26in, m

£104.70
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Shimano deore mountain bike - xt,

Shimano deore mountain bike - xt,

£404.50
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Shimano folding mountain bike - shimano,

Shimano folding mountain bike - shimano,

£179.90
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Mountain bike inch wheel - bike,

Mountain bike inch wheel - bike,

£219.90
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Speed mountain bike - speed,

Speed mountain bike - speed,

£160.99
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Speed city hybrid bike - 21-speed,

Speed city hybrid bike - 21-speed,

£254.00
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Mongoose c303 26in aluminium - c303,

Mongoose c303 26in aluminium - c303,

£22.54
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Univega alpina 502 26in - univega,

Univega alpina 502 26in - univega,

£83.90
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Huffy korros inch speed - huffy,

Huffy korros inch speed - huffy,

£224.99
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Rockrider 500 mountain bike - rockrider,

Rockrider 500 mountain bike - rockrider,

£187.90
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British eagle reflex 26in - eagle,

British eagle reflex 26in - eagle,

£21.50
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Harrow wahdo 26in - wahdo, mountain

Harrow wahdo 26in - wahdo, mountain

£47.50
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Carrera 26in hardtail - carrera, m

Carrera 26in hardtail - carrera, m

£180.62
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Mongoose pro mountain bike - pro,

Mongoose pro mountain bike - pro,

£156.70
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Marley mountain bike 26in - bike, l

Marley mountain bike 26in - bike, l

£567.70
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Shimano folding mountain bike - mountain,

Shimano folding mountain bike - mountain,

£179.90
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Adult mountain bike front - adult,

Adult mountain bike front - adult,

£209.90
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Wheels mountain bike - wheels, 21

Wheels mountain bike - wheels, 21

£209.99
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5 29inch mountain - 24/26/27.5/29inch,

5 29inch mountain - 24/26/27.5/29inch,

£199.90
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Pink inch mountain bike 21 - 26,

Pink inch mountain bike 21 - 26,

£199.99
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Wheel mountain bike fat - bike,

Wheel mountain bike fat - bike,

£259.90
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Labomba large dirt jump - gt,

Labomba large dirt jump - gt,

£715.60
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Timberline mountain bike - 26,

Timberline mountain bike - 26,

£373.90
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Challenge ffs mountain bike - 26,

Challenge ffs mountain bike - 26,

£131.74
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Inch mountain bike adult - inch,

Inch mountain bike adult - inch,

£209.90
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Evercross mountain bike for - mountain,

Evercross mountain bike for - mountain,

£250.00
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2020 giant terrago 2 - terrago,

2020 giant terrago 2 - terrago,

£465.70
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Shimano folding mountain bike - shimano,

Shimano folding mountain bike - shimano,

£209.90
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29in electric bike - 29in, 18.6ah

29in electric bike - 29in, 18.6ah

£649.00
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Girls black carrera - girls,

Girls black carrera - girls,

£208.70
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Speed mountain bike cycle - mountain,

Speed mountain bike cycle - mountain,

£6.79
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5inch folding mountain - 27.5inch,

5inch folding mountain - 27.5inch,

£209.90
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Mountain bike 27 5 - 24", 27.5"

Mountain bike 27 5 - 24", 27.5"

£249.99
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Inch mountain bike - inch,

Inch mountain bike - inch,

£199.99
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Commencal meta 2006 full - commencal,

Commencal meta 2006 full - commencal,

£353.50
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Canyon torque slopeduro dirt - canyon,

Canyon torque slopeduro dirt - canyon,

£750.70
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Inch mountain bike - 24-29, adult

Inch mountain bike - 24-29, adult

£219.90
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Giant revel mountain bike - 3,

Giant revel mountain bike - 3,

£73.50
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5 29inch mountain - 24/26/27.5/29inch,

5 29inch mountain - 24/26/27.5/29inch,

£209.90
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Carrera mountain bike 29in - mountain,

Carrera mountain bike 29in - mountain,

£146.30
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Inch mountain hybrid - hybrid, bike

Inch mountain hybrid - hybrid, bike

£244.99
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Apollo interzone junior - apollo,

Apollo interzone junior - apollo,

£138.59
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Wheel folding mountain - folding,

Wheel folding mountain - folding,

£189.90
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Mountain bike licorne - bike,

Mountain bike licorne - bike,

£259.19
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Retro vintage 1997 - retro, 16"

Retro vintage 1997 - retro, 16"

£1281.70
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Ammaco disrupt 29in - ammaco, mountain

Ammaco disrupt 29in - ammaco, mountain

£104.70
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Mountain bike 21 - 26",

Mountain bike 21 - 26",

£219.90
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Probike escape 26in black - probike,

Probike escape 26in black - probike,

£78.70
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Adult mountain bike front - mountain,

Adult mountain bike front - mountain,

£189.99
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Carrera valour 6061 men s - valour, men's

Carrera valour 6061 men s - valour, men's

£26.70
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Folding mountain bike - folding,

Folding mountain bike - folding,

£298.99
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5inch mountain bike - mountain,

5inch mountain bike - mountain,

£199.90
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Shimano mountain bike 5in - shimano, 27.5in

Shimano mountain bike 5in - shimano, 27.5in

£125.50
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Giant mountain bike 26in - mountain, m

Giant mountain bike 26in - mountain, m

£516.70
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Huffy full suspension - 26,

Huffy full suspension - 26,

£200.00
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Pink 26inch mountain - mountain, bike

Pink 26inch mountain - mountain, bike

£189.90
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Basis connect mountain - mountain, bike

Basis connect mountain - mountain, bike

£211.99
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29in full suspension - 24-29in,

29in full suspension - 24-29in,

£219.90
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Folding mountain bike 21 - 27.5"folding,

Folding mountain bike 21 - 27.5"folding,

£229.99
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Mountain bike speed dual - mountain,

Mountain bike speed dual - mountain,

£74.00
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5inch mountain bike 21 - mountain,

5inch mountain bike 21 - mountain,

£219.90
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Speed mountain bike - 24,

Speed mountain bike - 24,

£6.79
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Inch mountain bike 21 - mountain,

Inch mountain bike 21 - mountain,

£209.99
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Inch wheel full - inch,

Inch wheel full - inch,

£199.90
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Mountain bike 21 - mountain,

Mountain bike 21 - mountain,

£219.90
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5 inch folding - 24/26/27.5,

5 inch folding - 24/26/27.5,

£209.90
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Umail unisex mountain - unisex,

Umail unisex mountain - unisex,

£209.90
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5 inch full - 26, 27.5

5 inch full - 26, 27.5

£189.90
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Huffy korros inch - huffy, 21-speed

Huffy korros inch - huffy, 21-speed

£242.99
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Cross womens mountain bike - womens,

Cross womens mountain bike - womens,

£191.99
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Folding mountain bike - folding,

Folding mountain bike - folding,

£219.99
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Inch mountain bike fat - 26,

Inch mountain bike fat - 26,

£259.90
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New inch mountain bike 21 - new, 27.5

New inch mountain bike 21 - new, 27.5

£209.99
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Boss venom wheel mountain - boss, 26"

Boss venom wheel mountain - boss, 26"

£229.99
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5inch folding mountain - 24-27.5inch,

5inch folding mountain - 24-27.5inch,

£189.90
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Mountain bike 22 24 - 18", 22"

Mountain bike 22 24 - 18", 22"

£156.69
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Full suspension mountain bike - full,

Full suspension mountain bike - full,

£229.99
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Inch adult mountain - mountain, bike

Inch adult mountain - mountain, bike

£209.90
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Inch adult mountain bike - adult,

Inch adult mountain bike - adult,

£219.90
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Mountain bike 21 speed - 26,

Mountain bike 21 speed - 26,

£269.99
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Claud butler cape - cape, wrath

Claud butler cape - cape, wrath

£104.70
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26inch mountain bike - bike, pink

26inch mountain bike - bike, pink

£199.90
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Inch wheel adult - wheel, mountain

Inch wheel adult - wheel, mountain

£219.90
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Mountain bike inch wheel - mountain,

Mountain bike inch wheel - mountain,

£219.99
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Bike 29in electric 48v - bike,

Bike 29in electric 48v - bike,

£649.00
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📊96 listings · from £6.79 · avg £226.76
⚠️ These listings were last updated more than 19 days ago. Search for fresh listings

Browse 96 21 speed mountain bike listings currently in our index. Prices range from £6.79 to £1281.7, with an average of £226.76. 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 →

Try this: 24 trials bike | 26 mtb frame | 29er bikes | 3 wheel bike | 3 wheel bikes | 50cm road bike | 52cm road bike | alex moulton bicycle | ammaco bike | apollo 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 96 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 £6.79, while premium listings can reach £1281.7 — giving you a wide budget spread to work with. The average price of £226.76 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.

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