• Frontier SX Eagle in Jet Black
  • Frontier SX Eagle
  • Frontier NX Eagle in Spruce
  • Frontier Deore in Chilli
  • Sonder Frontier SX Eagle Recon Hobo 29er mountain bike in black
  • Sonder Frontier SX Eagle Recon Hobo 29er mountain bike in forest green
  • Sonder Frontier SX Eagle Recon Hobo 29er mountain bike in white crayon

    Aaron Jackson

    Model is 180cm (5' 11"), wears a size medium and regular leg length.

    Ben Field

    Model is 180cm (5' 11"), wears a size medium/large ,medium bottoms and long? leg length.

    Dan Dean

    Model is 169cm (5' 6.5"), wears a size medium ,32 bottoms and short leg length.

    Hannah Murray

    Model is 172.7cm (5' 8"), wears a size 10 and long leg length.

    Rachel Gatehouse

    Model is 165cm (5' 5"), wears a size 10 and long leg length.

show more

Aaron Jackson

Model is 180cm (5' 11"), wears a size medium and regular leg length.

Ben Field

Model is 180cm (5' 11"), wears a size medium/large ,medium bottoms and long? leg length.

Dan Dean

Model is 169cm (5' 6.5"), wears a size medium ,32 bottoms and short leg length.

Hannah Murray

Model is 172.7cm (5' 8"), wears a size 10 and long leg length.

Rachel Gatehouse

Model is 165cm (5' 5"), wears a size 10 and long leg length.

[Bikes] Complete Bikes
  • Special Offer

Frontier SX Eagle

Multi-activity trail bike

£899 £1,099

1

Select Options

2

Customize

3

Select Accessories

Reset

Quick, lightweight modern mountain bike with SRAM SX Eagle 1x12 groupset and Rockshox Recon Silver RL fork.
Buy Now. Deliveries from 7 April.

1

Select Options

Edit

  • Size
  • Colour
  • Size:

  • Colour:

2

Customize

Edit

Every Sonder bike is built to order so tell us exactly how you want it. Make any changes you want from the standard build and when you're done, just hit “Add to Bag” at the bottom of the page.

Handlebar

Sonder Aspect Riser [OEM]
Sonder Aspect Riser 780mm

+£0.00

Sonder Horizon Flat [OEM]
Sonder Horizon Flat 720mm

+£0.00

Sonder Confucius
Sonder Confucius

+£34.99 +£29.99

sonder horizon carbon flatcar handlebar
Sonder Horizon Carbon Flat Black

+£79.99 +£49.99

sonder aspect carbon flat handlebar flatbar
Sonder Aspect Carbon Riser 780mm

+£79.99 +£49.99

Saddle

Sonder Abode [OEM]
Sonder Abode Black / 138

+£0.00

Sonder Abode [OEM]
Sonder Abode Black / 158

+£0.00

Brooks Cambium C17 Saddle [OEM] / All Weather / Black
Brooks Cambium C17 Saddle / All Weather / Black

+£114.99 +£92.49

Sonder Zone [OEM]
Sonder Zone 152 / Black

+£34.99 +£29.99

Sonder Kura [OEM]
Sonder Kura

+£47.99 +£39.99

Seatpost

Sonder Seatpost [OEM] /
Sonder Seatpost / 31.6mm / 400mm

+£0.00

X-Fusion Manic Drop Seatpost and Lever
X-Fusion Manic Drop Seatpost and Lever 31.6mm / 125mm

+£119.99

X-Fusion Manic Drop Seatpost and Lever
X-Fusion Manic Drop Seatpost and Lever 31.6mm / 150mm

+£119.99

X-Fusion Manic Drop Seatpost and Lever
X-Fusion Manic Drop Seatpost and Lever 31.6mm / 170mm

+£119.99

Cane Creek eeSilk+ [OEM]
Cane Creek eeSilk+ 31.6mm / Alloy

+£229.99 +£184.99

Cane Creek eeSilk+ [OEM] / 31.6mm / Alloy
Cane Creek eeSilk+ / 31.6mm / Alloy

+£179.99

Stem

Sonder Piskie [OEM]
Sonder Piskie 31.8mm / 35mm

+£0.00

Sonder Piskie [OEM]
Sonder Piskie 31.8mm / 45mm

+£0.00

Sonder Piskie [OEM]
Sonder Piskie 31.8mm / 55mm

+£0.00

sonder talo bike stem
Sonder Talo 35

+£44.99 +£37.49

sonder talo bike stem
Sonder Talo 45mm

+£44.99 +£37.49

Forks

Rockshox Recon RL Silver
Rockshox Recon RL Silver 100mm / 29

+£0.00

Rockshox Reba RL [OEM] / 100mm / 29
Rockshox Reba RL / 100mm / 29

+£299.99

Rockshox Sid SL Ultimate [OEM] / 29 / 100mm
Rockshox Sid SL Ultimate / 29 / 100mm

+£574.99

Tubes

WTB [OEM] Inner Tube / 29 / 2.2-2.4
WTB Inner Tube / 29 / 2.2-2.4 Black

+£0.00

Tubeless Tyre Upgrade and Setup
Tubeless Tyre Upgrade and Setup

+£44.99

Wheels

Sonder Nova XC [OEM] Wheelset / UK Build
Sonder Nova XC Wheelset / UK Build HG

+£0.00

Sonder Nova XC [OEM] Wheelset
Sonder Nova XC Wheelset Shimano

+£0.00

Sonder Alpha 27.5 [OEM] Wheelset / UK Build
Sonder Alpha 27.5 Wheelset / UK Build HG

+£329.99 +£169.99

Sonder Alpha 29 XC [OEM] Wheelset / UK Build
Sonder Alpha 29 XC Wheelset / UK Build HG

+£329.99 +£169.99

    3

    Select Accessories

    Edit

    Bottle Cages

    No Bottle Cages
    No Bottle Cages (none)

    +£0.00

    Sonder Buzz Wire
    Sonder Buzz Wire Single

    +£5.49 +£4.99

    Sonder Buzz Wire
    Sonder Buzz Wire Pair

    +£10.99 +£8.99

    love mud side blade side loading bottle cage left
    Sonder Sideblade Left Entry / Black

    +£6.99 +£5.99

    love mud side blade side loading bottle cage right
    Sonder Sideblade Right Entry / Black

    +£6.99 +£5.99

    Sonder Blade
    Sonder Blade Black

    +£17.99 +£14.99

    Sonder Blade
    Sonder Blade Black / Pair

    +£29.99 +£24.99

    Sonder Ti Wire Bottle Cage
    Sonder Ti Wire Bottle Cage Single

    +£44.99 +£37.49

    Sonder Ti Wire Bottle Cage
    Sonder Ti Wire Bottle Cage Pair

    +£79.99 +£64.99

    Front Lights

    No Front Light
    No Front Light (none)

    +£0.00

    alpkit hadron bike light
    Hadron

    +£99.99 +£79.99

    Rear Lights

    No Rear Light
    No Rear Light (none)

    +£0.00

    Lights Accessories

    No Bike Light Accessories
    No Bike Light Accessories (none)

    +£0.00

    alpkit cockpit bike light gps mount
    Garmin Outfront Mount / Black

    +£24.99 +£19.99

    alpkit helmet mount bike light gps
    Helmet Mount Black

    +£7.99 +£6.99

    Mudguards

    No Mudguards
    No Mudguards (none)

    +£0.00

    sonder fender
    Sonder Fender Front MTB

    +£6.99 +£5.99

    Pedals

    No Pedals
    No Pedals (none)

    +£0.00

    reko clipless bike pedal
    Sonder Reko

    +£59.99 +£49.99

    sonder Jekyll clipless and flat hybrid pedal
    Sonder Jekyll Black

    +£79.99 +£64.99

    sonder slingshot clipless pedal
    Sonder Slingshot Black

    +£79.99 +£64.99

    distortion flat mountain bike pedal
    Sonder Distortion

    +£69.99 +£59.99

      Initial Price

      Frontier SX Eagle / Select a frame...
      £899.00

      Extras

      £0.00

      Total Price

      £899.00
      Buy Now. Deliveries from 7 April.

      Frontier is our multi-activity hardtail mountain bike. Ride hard at the trail centre, load it up for a midweek bikepacking trip, pocket your passport and continue around the world. Frontier is an adaptable off-road explorer.

      The geometry is for long day comfort but it’s no slouch.

      At a glance

      • SRAM SX Eagle 12-speed groupset
      • Rockshox Recon Silver RL fork
      • Sonder Nova 27.5 / 29" XC wheelset
      • 6061 aluminium frame

      The 6061 aluminium frame provides a durable and stiff chassis giving a responsive kick as you demand power when the slope steepens or enjoy feedback and precision through the corners.

      Available as a fully rigid or with 100mm suspension fork. Set it up for XC race speed or for all day big mile comfort.

      Tyre clearance gives you the choice of 27.5+ or 29in wheelsets. Bolt through 148mm boost rear spacing provides the benefit of stronger, stiffer and more efficient wheels.

      Why SX Eagle?

      SRAM Eagle drivetrains are designed, engineered and manufactured to work as complete drivetrain systems. Its 1x drivetrain is built to be lightweight, strong and intuitive, with the gear range to ride on any terrain.

      SX Eagle provides the same Eagle performance benefits as NX Eagle, but at a lower price point. The main differences stem from the choice of materials and finish options, but functionally SX is fully compatible with SRAMs Eagle groupset.

      Features

      Tuned for all-round capability

      Built for a balance of cross country efficiency and trail centre capability. A favourite with bikepackers looking for all-day comfort and performance.

      Light and clean

      Clean lines thanks to internal cable routing. Frontier also incorporates routing for a dropper seat post. The 6061 aluminium tubing is durable, light, low maintenance and stiff.

      Wider tyres. More grip.

      Extra width between the chainstays gives you the choice of running 27.5+ tyres up to 3 inches or 29 inch tyres up to 2.5 inches.

      Made for stronger wheels

      Designed around bolt through Boost 148mm rear spacing providing the benefit of stronger, stiffer and more efficient wheels.

      Wilderness trail features

      Chainstay mounted disc brakes. And triple bottle mounts.

      Build Spec
      Frameset
      Frame:Frontier Frame | 6061 Aluminium | T6 Heat-Treated
      Fork:RockShox Recon Silver RL | 100mm (travel)
      Headset:FSA Orbit C-40-ACB
      Groupset
      Shifters:SRAM SX Eagle Trigger | 1x | 12-speed
      Brakes:SRAM Level | Hydraulic | post mount
      Rotors:SRAM Centerline | 180mm (front), 160mm (rear) | 6-bolt
      Rear derailleur:SRAM SX Eagle | Long cage | 12-speed
      Chainset:SRAM SX Eagle | 170mm | 32t
      Cassette:SRAM PG1210 | 11-50t | 12-speed
      Chain:SRAM NX Eagle | 12-speed
      Bottom bracket:SRAM PowerSpline | 73mm | 118mm
      Wheelset
      Wheels:Sonder Nova 27.5" or 29 XC
      Tyres:Goodyear Peak | 29 x 2.4" | Black
      Tubes:WTB | 29 x 2.2-2.4"
      Finishing kit
      Handlebars:Sonder Aspect Riser | 780mm
      Stem:Sonder Piskie
      Seatpost:Sonder Seatpost | 31.6mm
      Saddle:Sonder Abode
      Grips:Sonder Clutch | Black
      Weight
      Frame:S: 1.8kg; M: 1.85kg; L: 1.95kg; XL: 2.05kg;
      Build:S: 12.75kg; M: 12.8kg; L: 12.9kg; XL: 13kg;
      Pedals not included with full builds
      Specifications are subject to change without notice
      Geometry and Sizing

      Sizing

      It is important to get the right size bike, if the bike fits you well it will be faster, more comfortable and easier to handle.

      Generally we recommend:
      Small: Riders between 5ft 2in and 5ft 7in (157-170cm)
      Medium: Riders between 5ft 6in and 5ft 10in (167-177cm)
      Large: Riders between 5ft 9in and 6ft 2in (175-187cm)
      X-Large: Riders of 6ft 2in + (187cm)

      Size Small Medium Large X-Large
      ST - Seat tube 380 430 480 520
      TT - Top tube 563.1 597.3 621.6 647.3
      HT - Head tube 110 115 130 150
      HA - Head angle 68 68 68 68
      SA - Seat angle 73 73 73 73
      CS - Chainstay 445 445 445 445
      BB - BB drop 50 50 50 50
      FO - Fork offset 51 51 51 51
      WB - Wheelbase 1095.7 1131.3 1157 1184.5
      SO - Stand over 764 793.9 824.6 852.6
      RE - Reach 390 420 440 460
      SK - Stack 566.1 580.1 594 612.5
      Frame Spec
      Frame Weight: S: 1.84kg; M: 1.9kg; L: 1.98kg; XL: 2.03kg
      Rigid Fork Weight - uncut: 1kg
      6061 Aluminium frame
      Optimised for rigid or 100mm suspension forks
      Internal cable routing through downtube
      Bolt Through Boost 148mm rear spacing for wheel strength and optimal chainline
      Fork built around Bolt Through Boost 110mm spacing
      Threaded 73mm BSA BB shell for no-creak assembly
      Chainstay mounted disc brake for clean lines and damage protection
      Triple bottle cage mount on downtube
      Use a seat clamp with integrated mounts for pannier rack compatibility
      Clearance for 3 inch 27.5+ or 2.5 inch 29er tyres
      Reverb Stealth port
      EN 14766 compliant

      • Frontier SX Eagle in Jet Black
      • Frontier SX Eagle
      • Frontier NX Eagle in Spruce
      • Frontier Deore in Chilli
      • Sonder Frontier SX Eagle Recon Hobo 29er mountain bike in black
      • Sonder Frontier SX Eagle Recon Hobo 29er mountain bike in forest green
      • Sonder Frontier SX Eagle Recon Hobo 29er mountain bike in white crayon