20 mountain bikes
20 mountain bikes for sale on Ireland's largest auction and classifieds sites
Inch mountain bike - inch, speed - £94.29
Gross weight 12.65kg • 27.88lbs maximum bearing • Capacity 85kg 187lbs - Free postage - New and Used
Gross weight 12.65kg • 27.88lbs maximum bearing • Capacity 85kg 187lbs - Free postage - New and Used
24 inch unisex - 22'', 24'' - £134.99
Twoo speed gearing • You have perfect • Gear ratio any - Free postage - New and Used
Twoo speed gearing • You have perfect • Gear ratio any - Free postage - New and Used
Cannondale kids trail - kids, - £208.70
Sale cannondale kids • Trail 20w purchased • Last year but - Free postage - New and Used
Sale cannondale kids • Trail 20w purchased • Last year but - Free postage - New and Used
20inch kids bike - 20inch, - £132.00
Brakes front rear • Sporty design modern • Matte finish stylish - Free postage - New and Used
Brakes front rear • Sporty design modern • Matte finish stylish - Free postage - New and Used
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Inch mountain bike - bike, speed - £86.99
Mudguards both front • Rear wheels are • Effectively blocking water - Free postage - New and Used
Mudguards both front • Rear wheels are • Effectively blocking water - Free postage - New and Used
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48 listings · from £24.95 · avg £136.36
⚠️ These listings were last updated more than 10 days ago.
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Browse 48 20 mountain bikes listings currently in our index. Prices range from £24.95 to £280.65, with an average of £136.36. 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 20 mountain bikes →
Scott scale inch kids - scale, - £182.70
Weighing light yet • Robust ideal choice • Those just starting - Free postage - New and Used
Weighing light yet • Robust ideal choice • Those just starting - Free postage - New and Used
Inch mountain bike - 20-inch, - £89.27
Gross weight 12.65kg • 27.88lbs maximum bearing • Capacity 85kg 187lbs - Free postage - New and Used
Gross weight 12.65kg • 27.88lbs maximum bearing • Capacity 85kg 187lbs - Free postage - New and Used
Barracuda charge wheel - charge, 20" - £199.99
Fierce bold design • This bike will • Have your child - Free postage - New and Used
Fierce bold design • This bike will • Have your child - Free postage - New and Used
Orbea wheels kids mountain - 20", - £182.70
Orbea mountain bike • Inch wheels kids • Aluminum frame good - Free postage - New and Used
Orbea mountain bike • Inch wheels kids • Aluminum frame good - Free postage - New and Used
Kids mountain bike boys - kids, 20” - £129.99
Bike type kids • Durable safe adventure • Ready gender boys - Free postage - New and Used
Bike type kids • Durable safe adventure • Ready gender boys - Free postage - New and Used
New inch kids bike - 18-22, boys - £162.90
This bike also • Gives you adjustable • Can customise suit - Free postage - New and Used
This bike also • Gives you adjustable • Can customise suit - Free postage - New and Used
20inch kids bike - kids, girls - £149.99
Veloxbike youth kids • Bike lightweight durable • Adventure ready whether - Free postage - New and Used
Veloxbike youth kids • Bike lightweight durable • Adventure ready whether - Free postage - New and Used
Specialized jett kids mountain - specialized, - £219.00
Kids move fast • Grow faster right • Bike young rider - Free postage - New and Used
Kids move fast • Grow faster right • Bike young rider - Free postage - New and Used
New inch unisex mountain - 20, - £132.68
Description cycling great • Exercise that can • Help your child - Free postage - New and Used
Description cycling great • Exercise that can • Help your child - Free postage - New and Used
Inch unisex mountain bike - inch, - £139.44
Package included mountain • Kettle holder storage • Bag english installation - Free postage - New and Used
Package included mountain • Kettle holder storage • Bag english installation - Free postage - New and Used
Bucklos inch mtb oil - bucklos, 20*4.0 - £115.59
Double shoulder suspension • Fork specification brand • Travel 180mm wheel - Free postage - New and Used
Double shoulder suspension • Fork specification brand • Travel 180mm wheel - Free postage - New and Used
New inch kids bike - new, - £162.90
Wheels brakes gears • Must set fine • Tuned way they - Free postage - New and Used
Wheels brakes gears • Must set fine • Tuned way they - Free postage - New and Used
Dallingridge melody girls - melody, - £164.99
Kitted 1.95 all • Terrain tyres ensure • Traction regardless condition - Free postage - New and Used
Kitted 1.95 all • Terrain tyres ensure • Traction regardless condition - Free postage - New and Used
Orbea wheels kids - wheels, mountain - £187.90
Orbea wheels kids • Bike excellent condition • But does have - Free postage - New and Used
Orbea wheels kids • Bike excellent condition • But does have - Free postage - New and Used
New inch mountain - 20, 7 - £169.90
Paired 2.35 extra • Wide anti skid • Tyres unmachined double - Free postage - New and Used
Paired 2.35 extra • Wide anti skid • Tyres unmachined double - Free postage - New and Used
Kids mountain bike 6 - 20”, - £149.99
Kids mountain bike • Disc brakes • Suspension all terrain - Free postage - New and Used
Kids mountain bike • Disc brakes • Suspension all terrain - Free postage - New and Used
Inch mountain bike speed - 20, - £86.98
Gross weight 12.65kg • 9.55kg 20.94lbs maximum • Bearing capacity 85kg - Free postage - New and Used
Gross weight 12.65kg • 9.55kg 20.94lbs maximum • Bearing capacity 85kg - Free postage - New and Used
Inch mountain bike speed - mountain, - £89.72
Mudguards both front • Rear wheels are • Effectively blocking water - Free postage - New and Used
Mudguards both front • Rear wheels are • Effectively blocking water - Free postage - New and Used
Professional dude kids boys - dude, - £179.99
Dude kids bike • Your child • Made specifically young - Free postage - New and Used
Dude kids bike • Your child • Made specifically young - Free postage - New and Used
Inch mountain bike speed - 20, - £129.99
- Free postage - New and Used
- Free postage - New and Used
Inch mountain bike - 20, 7 - £94.99
This kids mountain • Bike perfect ride • Outdoor adventures front - Free postage - New and Used
This kids mountain • Bike perfect ride • Outdoor adventures front - Free postage - New and Used
Dallingridge brave junior - dallingridge, - £183.99
Dallingridge introduce their • Junior hardtail mountain • Mtb riser unlike - Free postage - New and Used
Dallingridge introduce their • Junior hardtail mountain • Mtb riser unlike - Free postage - New and Used
Girls apollo kalin mountain - apollo, - £37.10
Girls apollo kalin • Mountain bike inch • Wheels bit rust - Free postage - New and Used
Girls apollo kalin • Mountain bike inch • Wheels bit rust - Free postage - New and Used
20inch air suspension fork mtb - suspension, - £104.99
Description mpn bk718air • 100 brand bucklos • Fork travel 100mm - Free postage - New and Used
Description mpn bk718air • 100 brand bucklos • Fork travel 100mm - Free postage - New and Used
Kids mountain bike black - mountain, 20in - £280.65
Adjust saddle height • Suit rider regularly • Inspect wear tear - Free postage - New and Used
Adjust saddle height • Suit rider regularly • Inspect wear tear - Free postage - New and Used
29er 20mm thru - 29er, - £86.95
Our new 2023 • 29er bombproof moutain • Mountain bike disc - Free postage - New and Used
Our new 2023 • 29er bombproof moutain • Mountain bike disc - Free postage - New and Used
Mountain bike made aluminum - mountain, - £108.18
Suspension adjustable soft • Hard rebound settings • This front fork - Free postage - New and Used
Suspension adjustable soft • Hard rebound settings • This front fork - Free postage - New and Used
Kids ridgeback inch - ridgeback, mx - £52.70
Kids ridgeback inch • Terrain mountain bike • Black high quality - Free postage - New and Used
Kids ridgeback inch • Terrain mountain bike • Black high quality - Free postage - New and Used
Orbea wheels kids - 20", - £234.70
Orbea wheels kids • Bike excellent condition • Please see photos - Free postage - New and Used
Orbea wheels kids • Bike excellent condition • Please see photos - Free postage - New and Used
Inch mountain bike - 20, - £119.99
- Free postage - New and Used
- Free postage - New and Used
Yoac mountain bike dual - yoac, 23 - £158.99
Yoac dual suspension • Mountain bike built • Adventure versatility speed - Free postage - New and Used
Yoac dual suspension • Mountain bike built • Adventure versatility speed - Free postage - New and Used
Inch mountain bike speed - inch, - £100.99
Mudguards both front • Rear wheels are • Effectively blocking water - Free postage - New and Used
Mudguards both front • Rear wheels are • Effectively blocking water - Free postage - New and Used
Schwalbe marathon puncture - marathon, - £24.95
Order before 3pm • Weekdays same day • Dispatch via hour - Free postage - New and Used
Order before 3pm • Weekdays same day • Dispatch via hour - Free postage - New and Used
Bucklos fat mtb fork - bucklos, 4.0” - £139.99
Description brand bucklos • Fork travel 180mm • Wheel 20inch spring - Free postage - New and Used
Description brand bucklos • Fork travel 180mm • Wheel 20inch spring - Free postage - New and Used
Mountain bike made - of, aluminum - £104.44
Suspension adjustable soft • Hard rebound settings • This front fork - Free postage - New and Used
Suspension adjustable soft • Hard rebound settings • This front fork - Free postage - New and Used
Inch mountain bike speed - bike, 7 - £96.49
- Free postage - New and Used
- Free postage - New and Used
Orbea mx20 kids mountain bike - kids, - £130.70
Good used condition • Collection whitley bay • Postage - Free postage - New and Used
Good used condition • Collection whitley bay • Postage - Free postage - New and Used
Inch bike adult teenager - bike, adult&teenager - £169.90
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
Inch mountain bike speed - 7, - £94.99
Mudguards both front • Rear wheels are • Effectively blocking water - Free postage - New and Used
Mudguards both front • Rear wheels are • Effectively blocking water - Free postage - New and Used
Frog bikes kids - bikes, unisex - £156.70
Frog inch wheel • Bike used but • Good working order - Free postage - New and Used
Frog inch wheel • Bike used but • Good working order - Free postage - New and Used
New 24 kids - new, 18" - £164.90
This stylish sturdy • Kids bike perfect • Gift your child - Free postage - New and Used
This stylish sturdy • Kids bike perfect • Gift your child - Free postage - New and Used
Mountain bike made aluminum - of, - £109.93
Suspension adjustable soft • Hard rebound settings • This front fork - Free postage - New and Used
Suspension adjustable soft • Hard rebound settings • This front fork - Free postage - New and Used
Mountain bike made - , aluminum - £104.44
Suspension adjustable soft • Hard rebound settings • This front fork - Free postage - New and Used
Suspension adjustable soft • Hard rebound settings • This front fork - Free postage - New and Used
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Everything you need to know about 20 mountain bikes
Whether you are looking for a brand-new or second-hand 20 mountain bikes, 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 £24.95, while premium listings can reach £280.65 — giving you a wide budget spread to work with. The average price of £136.36 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.