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21 speed mountain bike

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

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Mountain bike 21 - bike,

Mountain bike 21 - bike,

£155.99 · Buy It Now

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

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

£219.90 · Buy It Now

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Speed mountain bike - mountain, 26''

Speed mountain bike - mountain, 26''

£159.99 · Buy It Now

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Inch mountain bike - inch, adult

Inch mountain bike - inch, adult

£179.90 · Buy It Now

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Speed city hybrid bike - city,

Speed city hybrid bike - city,

£254.00 · Buy It Now

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Folding mountain bike - 26,

Folding mountain bike - 26,

£147.99 · Buy It Now

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Inch mountain bike adult - 24-29,

Inch mountain bike adult - 24-29,

£199.90 · Buy It Now

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Unisex mountain bike speed - mountain,

Unisex mountain bike speed - mountain,

£209.99 · Buy It Now

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Mountain bike 27 - bike, 27.5"

Mountain bike 27 - bike, 27.5"

£199.99 · Buy It Now

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Inch mountain bike adult 21 - 29,

Inch mountain bike adult 21 - 29,

£179.90 · Buy It Now

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Wheels mountain bike 21 - bike,

Wheels mountain bike 21 - bike,

£189.99 · Buy It Now

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Tridalade power pro 26in - power,

Tridalade power pro 26in - power,

£83.90 · Buy It Now

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Mountain bike inch wheel - bike, 27.5

Mountain bike inch wheel - bike, 27.5

£219.90 · Buy It Now

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Shimano folding mountain bike - folding,

Shimano folding mountain bike - folding,

£189.90 · Buy It Now

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Inch full suspension - full,

Inch full suspension - full,

£163.12 · Buy It Now

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Inch adult bike 21 speed - 21,

Inch adult bike 21 speed - 21,

£209.90 · Buy It Now

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Speed mountain bike - mountain, cycle

Speed mountain bike - mountain, cycle

£6.79 · Buy It Now

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Inch mountain bike speed - mountain, 21

Inch mountain bike speed - mountain, 21

£199.90 · Buy It Now

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Mens mountain bike - mens, mountaineer

Mens mountain bike - mens, mountaineer

£163.10 · Buy It Now

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Folding mountain bike - mountain,

Folding mountain bike - mountain,

£179.99 · Buy It Now

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Mountain bike 21 - 26, 21-speed

Mountain bike 21 - 26, 21-speed

£229.99 · Buy It Now

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Inch mountain bike adult - mountain,

Inch mountain bike adult - mountain,

£179.90 · Buy It Now

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Brand new gemarn - new, gemarn®

Brand new gemarn - new, gemarn®

£187.00 · Buy It Now

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Full suspension mountain - suspension, bike

Full suspension mountain - suspension, bike

£229.99 · Buy It Now

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Mens mountain bike - mountain,

Mens mountain bike - mountain,

£163.10 · Buy It Now

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Folding mountain bike shard - mountain,

Folding mountain bike shard - mountain,

£198.99 · Buy It Now

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Adult mountain bike front - adult,

Adult mountain bike front - adult,

£209.90 · Buy It Now

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Speed folding mountain bike - folding,

Speed folding mountain bike - folding,

£140.70 · Buy It Now

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Rcb26 mountain bike - rcb26",

Rcb26 mountain bike - rcb26",

£182.70 · Buy It Now

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Mountain bike 21 - 26",

Mountain bike 21 - 26",

£189.90 · Buy It Now

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Inch mountain bike speed - mountain, 21

Inch mountain bike speed - mountain, 21

£209.99 · Buy It Now

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Black hard tail - tail, mountain

Black hard tail - tail, mountain

£156.59 · Buy It Now

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Inch folding mountain - 24/26,

Inch folding mountain - 24/26,

£189.99 · Buy It Now

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5 inch folding - 24/26/27.5,

5 inch folding - 24/26/27.5,

£209.90 · Buy It Now

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Folding mountain bike - in,

Folding mountain bike - in,

£145.99 · Buy It Now

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Inch full suspension - 26,

Inch full suspension - 26,

£159.99 · Buy It Now

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Shimano folding mountain bike - shimano,

Shimano folding mountain bike - shimano,

£209.90 · Buy It Now

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Folding mountain bike 26in - folding,

Folding mountain bike 26in - folding,

£219.99 · Buy It Now

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Unisex bike specialized - unisex, bike,

Unisex bike specialized - unisex, bike,

£180.62 · Buy It Now

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Pink 26inch mountain bike - 24/26inch,

Pink 26inch mountain bike - 24/26inch,

£209.90 · Buy It Now

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Folding mountain bike - 27.5"folding,

Folding mountain bike - 27.5"folding,

£229.99 · Buy It Now

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Folding mountain bike - 26,

Folding mountain bike - 26,

£159.99 · Buy It Now

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Folding bike 26 - 24", 21

Folding bike 26 - 24", 21

£174.88 · Buy It Now

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Arden ridge speed - ridge, mens

Arden ridge speed - ridge, mens

£189.99 · Buy It Now

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Folding mountain bike - bike, full

Folding mountain bike - bike, full

£163.11 · Buy It Now

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26in mountain bike speed - bike, 21-speed

26in mountain bike speed - bike, 21-speed

£150.99 · Buy It Now

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Mens mountain bike mountaineer - mountain,

Mens mountain bike mountaineer - mountain,

£104.24 · Buy It Now

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Mens mountain bike mountaineer - mountain,

Mens mountain bike mountaineer - mountain,

£163.10 · Buy It Now

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Speed mountain bike - 24,

Speed mountain bike - 24,

£6.79 · Buy It Now

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Inch mountain hybrid - inch, bike

Inch mountain hybrid - inch, bike

£205.00 · Buy It Now

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Speed folding mountain - 21-speed,

Speed folding mountain - 21-speed,

£144.11 · Buy It Now

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Cross womens mountain bike - cross,

Cross womens mountain bike - cross,

£191.99 · Buy It Now

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

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

£199.90 · Buy It Now

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Bicycle twist gear shifters - gear, 21

Bicycle twist gear shifters - gear, 21

£10.49 · Buy It Now

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Lauxjack inch mountain - lauxjack,

Lauxjack inch mountain - lauxjack,

£208.70 · Buy It Now

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Speed folding mountain bike - folding,

Speed folding mountain bike - folding,

£140.70 · Buy It Now

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Mens mountain bike mountaineer - mens,

Mens mountain bike mountaineer - mens,

£188.31 · Buy It Now

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Mens mountain bike mountaineer - mens,

Mens mountain bike mountaineer - mens,

£163.10 · Buy It Now

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Bike speed full suspension - 21,

Bike speed full suspension - 21,

£161.48 · Buy It Now

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Trek 3700 blue black mountain - blue/black,

Trek 3700 blue black mountain - blue/black,

£41.68 · Buy It Now

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Mountain bike 21 speed - bike,

Mountain bike 21 speed - bike,

£219.99 · Buy It Now

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Adults red mountain bike - mountain,

Adults red mountain bike - mountain,

£156.70 · Buy It Now

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26inch mountain bike pink - mountain,

26inch mountain bike pink - mountain,

£199.90 · Buy It Now

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Shimano 5 mountain - 24"-27.5",

Shimano 5 mountain - 24"-27.5",

£209.90 · Buy It Now

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Inch folding bike 21 - &,

Inch folding bike 21 - &,

£177.77 · Buy It Now

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Folding mountain bike - folding,

Folding mountain bike - folding,

£161.99 · Buy It Now

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Inch mountain bike - 27.5, front

Inch mountain bike - 27.5, front

£207.99 · Buy It Now

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Inch adult mountain bike - 26,

Inch adult mountain bike - 26,

£209.90 · Buy It Now

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Carrera valour 26in - 26in, mountain

Carrera valour 26in - 26in, mountain

£52.70 · Buy It Now

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5inch wheel mountain bike - 27.5inch,

5inch wheel mountain bike - 27.5inch,

£209.90 · Buy It Now

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26in speed folding mountain - folding,

26in speed folding mountain - folding,

£163.11 · Buy It Now

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5inch folding mountain - folding,

5inch folding mountain - folding,

£209.90 · Buy It Now

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Mountain folding bike - 24/26,

Mountain folding bike - 24/26,

£218.99 · Buy It Now

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Mountain bike - 26,

Mountain bike - 26,

£209.90 · Buy It Now

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Folding mountain bike - folding, &

Folding mountain bike - folding, &

£177.77 · Buy It Now

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Mens mountain bike - mens, mountaineer

Mens mountain bike - mens, mountaineer

£163.10 · Buy It Now

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Unisex mountain bike speed - bike, 21

Unisex mountain bike speed - bike, 21

£209.90 · Buy It Now

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Wheel arden peak unisex - 26",

Wheel arden peak unisex - 26",

£219.99 · Buy It Now

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Folding mountain bike 24 - &,

Folding mountain bike 24 - &,

£177.77 · Buy It Now

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Wheel folding mountain - 24'',

Wheel folding mountain - 24'',

£189.90 · Buy It Now

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Inch full suspension - 26,

Inch full suspension - 26,

£139.99 · Buy It Now

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Mountain folding bike - mountain, &

Mountain folding bike - mountain, &

£176.99 · Buy It Now

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Mountain bike size 21 - mountain,

Mountain bike size 21 - mountain,

£229.00 · Buy It Now

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Inch mountain bike speed - bike, 21

Inch mountain bike speed - bike, 21

£163.11 · Buy It Now

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Wheel mountain bike - 26'',

Wheel mountain bike - 26'',

£265.59 · Buy It Now

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Inch mountain bike - mountain,

Inch mountain bike - mountain,

£209.99 · Buy It Now

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Black 21speed full suspension - black,

Black 21speed full suspension - black,

£163.11 · Buy It Now

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5inch mountain bike 21 - 24-27.5inch,

5inch mountain bike 21 - 24-27.5inch,

£199.90 · Buy It Now

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Carrera vulcan mountain bike - carrera,

Carrera vulcan mountain bike - carrera,

£115.10 · Buy It Now

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

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

£195.90 · Buy It Now

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Inch wheel mountain - wheel, bike

Inch wheel mountain - wheel, bike

£259.99 · Buy It Now

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Bike twist gear shifters - twist,

Bike twist gear shifters - twist,

£8.49 · Buy It Now

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Spatial 24inch wheel mountain - 24inch,

Spatial 24inch wheel mountain - 24inch,

£299.00 · Buy It Now

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Saracen mantra mountain bike - mountain,

Saracen mantra mountain bike - mountain,

£260.00 · Buy It Now

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Flying 26in mountain - bike, 21

Flying 26in mountain - bike, 21

£106.78 · Buy It Now

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Trioblade 650b mountain - 650b, bike

Trioblade 650b mountain - 650b, bike

£165.00 · Buy It Now

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📊96 listings · from £6.79 · avg £177.32
⚠️ These listings were last updated more than 11 days ago. Search for fresh listings

Browse 96 21 speed mountain bike listings currently in our index. Prices range from £6.79 to £299, with an average of £177.32. 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: 215 15 tyres | 215 60r16 | 215 60r16 tyres | 215 70r15 | 22 alloys | 22 amg wheels | 22 carat gold bangles | 22 carat gold jewellery | 22 range rover wheels | 22 rims

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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 £299 — giving you a wide budget spread to work with. The average price of £177.32 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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