•  Frontier frame only in Spruce
  • Frontier Frame
  • Frontier frame only in Jet Black
  • Frontier frame only in Chilli
  • Frontier Frame
  • Frontier Frame
  • Frontier Frame

    Frontier Frame

    $574

    1

    Select Options

    2

    Customize

    3

    Select Accessories

    Reset

    Lightweight alloy hardtail mountain bike frame to build your own bike from trail centre to wild and remote landscapes.
    Built to Order. Be Riding 12 October.

    1

    Select Options

    Edit

    • Size
      Please select an available Size
    • Colour
      • Frontier frame only in Chilli
      •  Frontier frame only in Spruce
      • Frontier frame only in Jet Black
      Please select an available Colour
    • Size:

    • Colour:

    • Customise and buy now. Deliveries from 12 October 2026

    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.

      3

      Select Accessories

      Edit

      Headset

      No Headset
      No Headset

      +$0.00

      FSA Orbit C-40-ACB Headset
      FSA Orbit C-40-ACB Headset 7.8mm Spacer

      +$38.99 +$31.99

      FSA [OEM] Orbit N0.57E Headset / 8.2mm Spacer
      FSA Orbit N0.57E Headset / 8.2mm Spacer Black

      +$31.99

        Initial Price

        Frontier Frame / Select a frame...
        $574.00

        Extras

        $0.00

        Total Price

        $574.00
        Built to Order. Be Riding 12 October.

        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
        • 6061 aluminium frame
        • 148mm Boost bolt through rear axle
        • Rear mudguard and pannier rack mounts
        • 650b+ and 29" wheel size compatible 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.

        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 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.

        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 2.5 inch 29er tyres
        Reverb Stealth port
        EN 14766 compliant

        Your actual build date will depend on additional components you specify and from receipt of full payment. For any queries contact our Sonder team on +44 1773 417006.

        •  Frontier frame only in Spruce
        • Frontier Frame
        • Frontier frame only in Jet Black
        • Frontier frame only in Chilli
        • Frontier Frame
        • Frontier Frame
        • Frontier Frame