Shop Best Mountain Bike Under $400

Sponsored
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$6,099.99
Trek Rail+ 5 Gen Aluminum Mountain Bike Viper Red S
Trek Bicycle
$6,099.99
Trek Rail+ 5 Gen Aluminum Mountain Bike Viper Red S
Trek Bicycle
$849.99
Trek Marlin 5 Gen 3 Aluminum Mountain Bike Fury Red XXL (29" Wheel)
Trek Bicycle
$849.99
Trek Marlin 5 Gen 3 Aluminum Mountain Bike Fury Red XXL (29" Wheel)
Trek Bicycle
$399.99
$469.99
Schwinn High Timber Mountain Bike For Adult Youth Men Women Boys Girls, 24 To 29-Inch Wheels, 7 Or 21-Speeds, Front Suspension, Aluminum And Steel
Amazon.com
2K+
Free shipping
14% off
$399.99
$469.99
Schwinn High Timber Mountain Bike For Adult Youth Men Women Boys Girls, 24 To 29-Inch Wheels, 7 Or 21-Speeds, Front Suspension, Aluminum And Steel
Amazon.com
$629.99
Trek Marlin 4 Gen 3 Aluminum Mountain Bike Blue Sage M (29" Wheel)
Trek Bicycle
$629.99
Trek Marlin 4 Gen 3 Aluminum Mountain Bike Blue Sage M (29" Wheel)
Trek Bicycle
$1,799.99
Procaliber 6 Aluminum Mountain Bike Satin Trek Black/Lithium Grey XL
Trek Bicycle
$1,799.99
Procaliber 6 Aluminum Mountain Bike Satin Trek Black/Lithium Grey XL
Trek Bicycle
$849.99
Trek Marlin 5 Gen 3 Aluminum Mountain Bike Mulsanne Blue XXL (29" Wheel)
Trek Bicycle
$849.99
Trek Marlin 5 Gen 3 Aluminum Mountain Bike Mulsanne Blue XXL (29" Wheel)
Trek Bicycle
$679.93
$799.99
Trek Marlin 5 Gen 3 Aluminum Mountain Bike Power Surge M (29" Wheel)
Trek Bicycle
15% off
$679.93
$799.99
Trek Marlin 5 Gen 3 Aluminum Mountain Bike Power Surge M (29" Wheel)
Trek Bicycle
$2,899.99
Fuel EX 5 Gen 7 Aluminum Mountain Bike Lithium Grey/Trek Black Splatter M
Trek Bicycle
$2,899.99
Fuel EX 5 Gen 7 Aluminum Mountain Bike Lithium Grey/Trek Black Splatter M
Trek Bicycle
$1,499.98
$2,199.99
Trek Farley 5 Aluminum Mountain Bike Satin Blue Sage To Lithium Grey Fade L
Trek Bicycle
31% off
$1,499.98
$2,199.99
Trek Farley 5 Aluminum Mountain Bike Satin Blue Sage To Lithium Grey Fade L
Trek Bicycle
$449.99
$479.99
Schwinn High Timber Mountain Bike For Adult Youth Men Women Boys Girls, 24 To 29-Inch Wheels, 7 Or 21-Speeds, Front Suspension, Aluminum And Steel
Amazon.com
2K+
Free shipping
$449.99
$479.99
Schwinn High Timber Mountain Bike For Adult Youth Men Women Boys Girls, 24 To 29-Inch Wheels, 7 Or 21-Speeds, Front Suspension, Aluminum And Steel
Amazon.com
$199.99
WEIZE Mountain Bike, 26/27.5 Inch Outdoor Cycling Bike,18-Speed/High-Carbon Steel/Dual Full Suspension, Adjustable Ergonomic Seat For Men Women Adult,
Amazon.com
547
Free shipping
$199.99
WEIZE Mountain Bike, 26/27.5 Inch Outdoor Cycling Bike,18-Speed/High-Carbon Steel/Dual Full Suspension, Adjustable Ergonomic Seat For Men Women Adult,
Amazon.com
$1,099.00
Salsa Rangefinder Deore 10 29Er Mountain Bike Dark Moss L
REI
$1,099.00
Salsa Rangefinder Deore 10 29Er Mountain Bike Dark Moss L
REI
$3,199.93
$4,999.99
Trek Fuel EX 8 GX AXS T-Type Gen 6 Aluminum Mountain Bike Rage Red XXL (29" Wheel)
Trek Bicycle
36% off
$3,199.93
$4,999.99
Trek Fuel EX 8 GX AXS T-Type Gen 6 Aluminum Mountain Bike Rage Red XXL (29" Wheel)
Trek Bicycle
$499.00
2025 Gravity FSX 29 LTD Dual Suspension 21 Speed Mountain Bike
Amazon.com
Free shipping
$499.00
2025 Gravity FSX 29 LTD Dual Suspension 21 Speed Mountain Bike
Amazon.com
$4,999.99
Fuel EX 9 Eagle 90 Gen 7 Aluminum Mountain Bike Lithium Grey/Trek Black Splatter M
Trek Bicycle
$4,999.99
Fuel EX 9 Eagle 90 Gen 7 Aluminum Mountain Bike Lithium Grey/Trek Black Splatter M
Trek Bicycle
$1,199.93
$1,399.99
Trek Marlin 7 Gen 3 Aluminum Mountain Bike Pennyflake M (29" Wheel)
Trek Bicycle
14% off
$1,199.93
$1,399.99
Trek Marlin 7 Gen 3 Aluminum Mountain Bike Pennyflake M (29" Wheel)
Trek Bicycle
$179.99
Ktaxon Mountain Bike 24/26/27.5 Inch Men & Women Mountain Bike With 21-Speed Adult Bikes, Double Disc Brake, Suspension Fork And High Carbon Steel
Amazon.com
292
Free shipping
$179.99
Ktaxon Mountain Bike 24/26/27.5 Inch Men & Women Mountain Bike With 21-Speed Adult Bikes, Double Disc Brake, Suspension Fork And High Carbon Steel
Amazon.com
$849.99
Trek Marlin 5 Gen 3 Aluminum Mountain Bike Miami Green/Dark Aquatic Fade L (29" Wheel)
Trek Bicycle
$849.99
Trek Marlin 5 Gen 3 Aluminum Mountain Bike Miami Green/Dark Aquatic Fade L (29" Wheel)
Trek Bicycle
$389.00
$672.00
Guardian Bikes - 26 Inch 7-Speed Kids Bike For Ages 10-14 - Black/Red
Guardian Bike Company
42% off
$389.00
$672.00
Guardian Bikes - 26 Inch 7-Speed Kids Bike For Ages 10-14 - Black/Red
Guardian Bike Company
$399.00
Cannondale Trail 20 Single-Speed Kids' Mountain Bike - Chlorine Blue Black Pearl 20 in
REI
$399.00
Cannondale Trail 20 Single-Speed Kids' Mountain Bike - Chlorine Blue Black Pearl 20 in
REI
$999.99
Trek Marlin 6 Gen 3 Aluminum Mountain Bike Gloss Lavender Haze M (29" Wheel)
Trek Bicycle
$999.99
Trek Marlin 6 Gen 3 Aluminum Mountain Bike Gloss Lavender Haze M (29" Wheel)
Trek Bicycle
$1,999.98
$2,999.99
Trek Farley 7 Aluminum Mountain Bike Baja Yellow XL
Trek Bicycle
33% off
$1,999.98
$2,999.99
Trek Farley 7 Aluminum Mountain Bike Baja Yellow XL
Trek Bicycle
$2,299.98
$3,999.99
Trek Farley 9 Aluminum Mountain Bike Mercury S
Trek Bicycle
42% off
$2,299.98
$3,999.99
Trek Farley 9 Aluminum Mountain Bike Mercury S
Trek Bicycle
$809.90
WLWLEO Mens Mountain Bike 26 Inch Full Suspension Mountain Bikes Bicycle, Soft Tail Dual Suspension Fat Tire Bike Double Disc Brake, Beach Snow All
Amazon.com
Free shipping
$809.90
WLWLEO Mens Mountain Bike 26 Inch Full Suspension Mountain Bikes Bicycle, Soft Tail Dual Suspension Fat Tire Bike Double Disc Brake, Beach Snow All
Amazon.com
$4,499.93
$7,149.99
Trek Fuel EX 9.8 XT Gen 6 Carbon Mountain Bike Deep Smoke ML (29" Wheel)
Trek Bicycle
37% off
$4,499.93
$7,149.99
Trek Fuel EX 9.8 XT Gen 6 Carbon Mountain Bike Deep Smoke ML (29" Wheel)
Trek Bicycle
$849.93
$999.99
Trek Marlin 6 Gen 3 Aluminum Mountain Bike Lava S (27.5" Wheel)
Trek Bicycle
15% off
$849.93
$999.99
Trek Marlin 6 Gen 3 Aluminum Mountain Bike Lava S (27.5" Wheel)
Trek Bicycle
$459.00
Co-Op Cycles REV 24 Kids' Mountain Bike Cascade Green 24 in
REI
$459.00
Co-Op Cycles REV 24 Kids' Mountain Bike Cascade Green 24 in
REI
$189.99
$219.99
Campingsurvivals 24/26/27.5 Inch Foldable Bikes For Adults 21 Speed Mountain Bike, Adult Bicycle With High Carbon Steel Frame, Full Suspension, Dual
Amazon.com
36
Free shipping
13% off
$189.99
$219.99
Campingsurvivals 24/26/27.5 Inch Foldable Bikes For Adults 21 Speed Mountain Bike, Adult Bicycle With High Carbon Steel Frame, Full Suspension, Dual
Amazon.com
$199.99
$219.99
HILAND 26 27.5 29 Inch Mountain Bike, Mens And Womens MTB With 21 Speeds, High-Tensile Steel Frame, V Brake, Hardtail Bicycle For Adults
Amazon.com
5
Free shipping
$199.99
$219.99
HILAND 26 27.5 29 Inch Mountain Bike, Mens And Womens MTB With 21 Speeds, High-Tensile Steel Frame, V Brake, Hardtail Bicycle For Adults
Amazon.com
$399.00
Cannondale Trail 20 Single-Speed Kids' Mountain Bike Chlorine Blue 20 in
REI
$399.00
Cannondale Trail 20 Single-Speed Kids' Mountain Bike Chlorine Blue 20 in
REI
$149.98
Outroad 26 Inch Mountain Bike, 7/21-Speed/High-Carbon Steel/Aviation Grade Frame, Dual Disc/V Brake, Adjustable Ergonomic Seat Bicycle For Men Women
Amazon.com
49
$149.98
Outroad 26 Inch Mountain Bike, 7/21-Speed/High-Carbon Steel/Aviation Grade Frame, Dual Disc/V Brake, Adjustable Ergonomic Seat Bicycle For Men Women
Amazon.com
$349.98
Outroad Fat Tire Mountain Bike With 26 Inch Wheels, 21 Speed With High Carbon Steel Frame, Double Disc Brake And Front Suspension Anti-Slip Bikes
Amazon.com
164
Free shipping
$349.98
Outroad Fat Tire Mountain Bike With 26 Inch Wheels, 21 Speed With High Carbon Steel Frame, Double Disc Brake And Front Suspension Anti-Slip Bikes
Amazon.com
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Shop Best Mountain Bike Under $400

Sponsored
About our ads
$6,099.99
Trek Rail+ 5 Gen Aluminum Mountain Bike Viper Red S
Trek Bicycle
$6,099.99
Trek Rail+ 5 Gen Aluminum Mountain Bike Viper Red S
Trek Bicycle
$849.99
Trek Marlin 5 Gen 3 Aluminum Mountain Bike Fury Red XXL (29" Wheel)
Trek Bicycle
$849.99
Trek Marlin 5 Gen 3 Aluminum Mountain Bike Fury Red XXL (29" Wheel)
Trek Bicycle
$399.99
$469.99
Schwinn High Timber Mountain Bike For Adult Youth Men Women Boys Girls, 24 To 29-Inch Wheels, 7 Or 21-Speeds, Front Suspension, Aluminum And Steel
Amazon.com
2K+
Free shipping
14% off
$399.99
$469.99
Schwinn High Timber Mountain Bike For Adult Youth Men Women Boys Girls, 24 To 29-Inch Wheels, 7 Or 21-Speeds, Front Suspension, Aluminum And Steel
Amazon.com
$629.99
Trek Marlin 4 Gen 3 Aluminum Mountain Bike Blue Sage M (29" Wheel)
Trek Bicycle
$629.99
Trek Marlin 4 Gen 3 Aluminum Mountain Bike Blue Sage M (29" Wheel)
Trek Bicycle
$1,799.99
Procaliber 6 Aluminum Mountain Bike Satin Trek Black/Lithium Grey XL
Trek Bicycle
$1,799.99
Procaliber 6 Aluminum Mountain Bike Satin Trek Black/Lithium Grey XL
Trek Bicycle
$849.99
Trek Marlin 5 Gen 3 Aluminum Mountain Bike Mulsanne Blue XXL (29" Wheel)
Trek Bicycle
$849.99
Trek Marlin 5 Gen 3 Aluminum Mountain Bike Mulsanne Blue XXL (29" Wheel)
Trek Bicycle
$679.93
$799.99
Trek Marlin 5 Gen 3 Aluminum Mountain Bike Power Surge M (29" Wheel)
Trek Bicycle
15% off
$679.93
$799.99
Trek Marlin 5 Gen 3 Aluminum Mountain Bike Power Surge M (29" Wheel)
Trek Bicycle
$2,899.99
Fuel EX 5 Gen 7 Aluminum Mountain Bike Lithium Grey/Trek Black Splatter M
Trek Bicycle
$2,899.99
Fuel EX 5 Gen 7 Aluminum Mountain Bike Lithium Grey/Trek Black Splatter M
Trek Bicycle
$1,499.98
$2,199.99
Trek Farley 5 Aluminum Mountain Bike Satin Blue Sage To Lithium Grey Fade L
Trek Bicycle
31% off
$1,499.98
$2,199.99
Trek Farley 5 Aluminum Mountain Bike Satin Blue Sage To Lithium Grey Fade L
Trek Bicycle
$449.99
$479.99
Schwinn High Timber Mountain Bike For Adult Youth Men Women Boys Girls, 24 To 29-Inch Wheels, 7 Or 21-Speeds, Front Suspension, Aluminum And Steel
Amazon.com
2K+
Free shipping
$449.99
$479.99
Schwinn High Timber Mountain Bike For Adult Youth Men Women Boys Girls, 24 To 29-Inch Wheels, 7 Or 21-Speeds, Front Suspension, Aluminum And Steel
Amazon.com
$199.99
WEIZE Mountain Bike, 26/27.5 Inch Outdoor Cycling Bike,18-Speed/High-Carbon Steel/Dual Full Suspension, Adjustable Ergonomic Seat For Men Women Adult,
Amazon.com
547
Free shipping
$199.99
WEIZE Mountain Bike, 26/27.5 Inch Outdoor Cycling Bike,18-Speed/High-Carbon Steel/Dual Full Suspension, Adjustable Ergonomic Seat For Men Women Adult,
Amazon.com
$1,099.00
Salsa Rangefinder Deore 10 29Er Mountain Bike Dark Moss L
REI
$1,099.00
Salsa Rangefinder Deore 10 29Er Mountain Bike Dark Moss L
REI
$3,199.93
$4,999.99
Trek Fuel EX 8 GX AXS T-Type Gen 6 Aluminum Mountain Bike Rage Red XXL (29" Wheel)
Trek Bicycle
36% off
$3,199.93
$4,999.99
Trek Fuel EX 8 GX AXS T-Type Gen 6 Aluminum Mountain Bike Rage Red XXL (29" Wheel)
Trek Bicycle
$499.00
2025 Gravity FSX 29 LTD Dual Suspension 21 Speed Mountain Bike
Amazon.com
Free shipping
$499.00
2025 Gravity FSX 29 LTD Dual Suspension 21 Speed Mountain Bike
Amazon.com
$4,999.99
Fuel EX 9 Eagle 90 Gen 7 Aluminum Mountain Bike Lithium Grey/Trek Black Splatter M
Trek Bicycle
$4,999.99
Fuel EX 9 Eagle 90 Gen 7 Aluminum Mountain Bike Lithium Grey/Trek Black Splatter M
Trek Bicycle
$1,199.93
$1,399.99
Trek Marlin 7 Gen 3 Aluminum Mountain Bike Pennyflake M (29" Wheel)
Trek Bicycle
14% off
$1,199.93
$1,399.99
Trek Marlin 7 Gen 3 Aluminum Mountain Bike Pennyflake M (29" Wheel)
Trek Bicycle
$179.99
Ktaxon Mountain Bike 24/26/27.5 Inch Men & Women Mountain Bike With 21-Speed Adult Bikes, Double Disc Brake, Suspension Fork And High Carbon Steel
Amazon.com
292
Free shipping
$179.99
Ktaxon Mountain Bike 24/26/27.5 Inch Men & Women Mountain Bike With 21-Speed Adult Bikes, Double Disc Brake, Suspension Fork And High Carbon Steel
Amazon.com
$849.99
Trek Marlin 5 Gen 3 Aluminum Mountain Bike Miami Green/Dark Aquatic Fade L (29" Wheel)
Trek Bicycle
$849.99
Trek Marlin 5 Gen 3 Aluminum Mountain Bike Miami Green/Dark Aquatic Fade L (29" Wheel)
Trek Bicycle