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Sonder Frontier Frame And Fork

Alloy frame and fork to build up your own 29er or 650b+ mountain biking, trail munching dream machine

£299.00

Available on finance, from per month*

Pictures are for illustration and some components and finishing kit of this build may be different. Please refer to the detailed spec sheet before placing an order.

  • Sonder Frontier 29er mountain bike frame and fork in white - Crayon
    Crayon
  • Sonder Frontier 29er mountain bike frame and fork in green - Forest
    Forest
  • Sonder Frontier 29er mountain bike frame and fork in black - Black
    Black

How To Order

All our bikes are built individually to order. If you want to change any part of the spec to suit your needs then get in touch.

  • Frontier Frame [V2]

  • 1. Select Size

    Please select a size. See the fitting guide for size information

    Preorder
    Small
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    Medium
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    Large
    Preorder
    X-Large
    2. Select Colour

    Please select a colour. If your desired colour is not available, you can request a Stock Alert and you will be emailed when the product is either back in-stock or on pre-order.

    Preorder
    Black
    Preorder
    Crayon
    Preorder
    Forest

    Please choose from the options above

    Please make sure you have read and understood the terms of a Pre-Order purchase before placing your order. Payment will be taken immediately and your item will be despatched when stock arrives. If you require additional items please place a separate order as it will be held and sent together. More about Pre Orders

Please allow 20 working days for us to build, check, pack and despatch your Sonder.

Alternative payment options

Guide to paying with Cycle to Work Schemes

Klarna Finance
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Alpkit Ltd acts as a credit intermediary and offer credit products provided exclusively by Klarna Bank AB (publ). Klarna Bank AB (publ) is Authorised by the Swedish Financial Services Authority (Finansinspektionen) and is subject to limited regulation by the Financial Conduct Authority. Details about the extent of our regulation by the Financial Conduct Authority are available from us on request. Finance is only available to permanent UK residents aged >18, subject to status, terms and conditions apply. Registered office: Sveavägen 46, 111 34 Stockholm, Sweden. Corporation ID number: 556737-0431.
At a glance
  • 6061 aluminium frame and rigid Boost fork
  • Relaxed riding position for comfort and performance
  • Hydraulic disk brakes compatible
  • Bolt through Boost 148mm rear spacing
  • Rear mudguard and pannier rack mounts
  • 650b+ and 29” wheel size compatible

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. With full rack mounts at the back and multiple boss mounts on the fork, Frontier is an adaptable off-road explorer.

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

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 Boost 148mm rear spacing provides the benefit of stronger, stiffer and more efficient wheels.

Aluminium Frame

The 6061 aluminium tubing is durable, light, low maintenance and stiff.

Internal Cable Routing

Clean lines and tidy cables thanks to internal downtube routing. Frontier also incorporates routing for a dropper seat post.

Wide Tyre Clearance

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.

Boost Axle Width

The Frontier frame is designed around bolt through Boost 148mm rear spacing providing the benefit of stronger, stiffer and more efficient wheels. Seatstay mounted disc brake for clean lines and damage protection.

Triple Bottle Cage Mounts

Fit 2 bottles in their standard location or run your downtube bottle cage a little lower to clear a bikepacking frame bag. Plus there’s an extra bottle cage mount under the downtube.

Frame spec

Frame Weight (kg): S: 1.84; M: 1.9; L: 1.98; XL: 2.03
Rigid Fork Weight - uncut (kg): 1.0
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 650b+ or 2.5 inch 29er tyres
Reverb Stealth port
EN 14766 compliant

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
Medium
Riders between 5ft 6in and 5ft 10in
Large
Riders between 5ft 9in and 6ft 2in
X-Large
Riders 6ft 2in and over
Frame size
Size Small Medium Large X-Large
ST - Seat tube 380 430 480 520
TT - Top tube 566 602 622 647
HT - Head tube 110 130 130 150
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 1089 1127 1147 1174.5
SO - Stand over 764 793 825 853
RE - Reach 390 420 440 460
SK - Stack 566 580 594 613
Build Frame and Fork
Frameset
Frame Sonder Frontier
Fork Sonder Frontier Fork
Headset not included with frame and fork
Weight
Frame S: 1.84kg; M: 1.9kg; L: 1.98kg; XL: 2.03kg
Fork 1.09 kg

Swapouts and Upgrades

You can interchange Love Mud components on this build at no additional cost. So if you want a different length of stem, a particular saddle or bar then let us know in the notes section in the checkout and we'll get in touch. We also hold big stocks of SRAM, Rockshox, WTB and regular build with Shimano, Hope, Cane Creek. We'll build your Sonder with any part that suits your needs. Give us a call, with the same experienced mechanic helping throughout your build you know who to call if there's anything you want to know.

Click here for more information

Faqs

Support

Alpine Bond Warranty

We offer a 10 year guarantee on both our handmade titanium and Reynolds steel frames. Our hand welded 6061-T6 alloy triple butted frames and carbon frames come with a 5 year manufacturing defect warranty. All our bikes are built, checked and signed off by Cytech trained mechanics before being despatched to you in a custom-made bike box.

Kudos

Reviews
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Mark James
'A' mountain bike!

That's exactly what this is.
It's a mountain bike.
It's what i used to ride 25+ years ago only now it's alloy instead of steel, the geometry is bang up to date, the gear ratios are better and more reliable and the brakes work!
I can't give a review on the standard equipment bike as i bought a frameset to build myself however i confirm it's very light, agile and comfortable for a bike with no suspension.
If you want to cover off road distances efficiently that's too rugged for a gravel bike then this could be the one to choose.
I built mine up as a 29er with 2.4 tyres, a SRAM NX Eagle groupset with Shimano Deore brakes and Jones style handlebars. It comes in at just under 12kg for a size XL bike which i think is very good.
Have i got any issues?
Not really.
Only thing to note is whilst i ordered the black version it's not really black. More like a very very dark brown. But i like it. And the fork weighs in heavier than advertised. Mine was over 1.4kg and i didn't trim much off the steerer tube.
All in all i'm very happy with it.
It's super comfortable and excellent value for money.