Sonder Frontier SX Eagle

Sonder Frontier SX Eagle

Hardtail mountain bike

£899.00

Quick, lightweight 29er modern mountain bike with SRAM SX Eagle 1x12 groupset, Rockshox Recon fork and Sonder Nova wheelset.

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All Sonder bikes can be customised.
You can make your selections on the next page.

Build your bike

Select your size and make any changes you want from the standard build. When you’re done, hit Add to Bag at the bottom of the page

  • Frame

    Size
    Please select your Size
    Colour
    Please select your Colour

    Configure your Frame

    size

    • Small

    • Medium

    • Large

    • X-Large

    colour

    • Black

    • Crayon

    • Forest

  • Accessories

    Bottle cages
    No Bottle Cages

    Configure your Accessories

    Bottle cages

    • No Bottle Cages

    • No Bottle Cages
    • Love Mud Buzz Wire Black

      +£3.99

    • Love Mud Buzz Wire

      The easiest and most convenient way to carry water on your bike, a classic cage design that holds your water bottle nice and snug.

      Buzz Wire is reassuringly durable, weighs just 65 grams and will carry your 500 or 750 ml water bottle with ease.

      If you are on expedition and looking for a way to pass a rest day make a bent wire loop and challenge someone to a game of Buzz Wire!

  • Finishing kit

    Handlebars
    Love Mud Aspect Riser 780mm
    Pedals
    No Pedals
    Saddles
    Love Mud Abode Black

    Configure your Finishing kit

    Handlebars

    • Love Mud Aspect Riser 780mm

    • Love Mud Aspect Riser [OEM]
    • Love Mud Confucius 760mm

      +£14.99

    • Love Mud Confucius

      Confucius says that you don't have to sacrifice what you love about your traditional riser bars just to get the flexibility of a hooped bar.

      We have taken our Aspect risers and evolved them in to a bar designed primarily for bikepacking. You won't have to adapt to a new hand position so you are not going to lose any control offroad and you can still get out of your saddle and power up the hills like a hero. If you do want to move your hands a bit a reduce the fatigue of a long ride the hoop extends out front giving a choice of further hand positions. Need some bar tape? Add a couple of rolls of Love Mud Reels for better comfort and grip.

      The bars have a slight riser but feel free to experiment and rotate them to your suiting. Keep them horizontal, or twist them up slightly to give yourself a streamlined TT style riding position to help you battle across a windblown Tierra del Fuego.

      Strength is not compromised as the main load bearing section of the bar is a single piece. Got gadgets? Confucius loves gadgets, and with the out-front hoop you can free up the bar around the stem. Simply attach your Garmin, 3000 lumen torches or mascots to the hoop and they will still be well within reach, maybe at an even better viewing angle and sit above your handle bar luggage.

      Take your bikepacking into the mountains; Confucius is a bar that gives you more control than a tradional swept back bar on technical terrain.

    • Love Mud Aspect Flat 720mm

      +£0.00

    • Love Mud Aspect Flat

      Flat bars help you keep the front end of your bike low, allowing you to get the weight over your front wheel when climbing and giving you more control in cornering.

      Our flats have a 5˚ rise so technically we should call them flatish, but if you really need them to be totally flat just rotate in the stem clamp!

    Pedals

    • No Pedals

    • No Pedals
    • Love Mud Torque Black

      +£25.99

    • Love Mud Torque

      Pedals: the humble yet essential afterthought that make all that time spent pondering over components worth the pain. Where would we be without them?

      Seriously grippy, reliable, and stable; Torque gives you the confidence to put down the power whatever the weather.

      A light and tough thermoplastic body combined with LSL sealed bearings around a CNC machined Cr-Mo makes Torque the kind of pedal you can depend on to withstand hours of use and abuse.

      Twelve 4 mm replaceable grip pins on each side of the pedal let you customise how much grip you’ll need and boost durability.

    • Love Mud Jekyll Black

      +£44.99

    • Love Mud Jekyll

      Jekyll is two faced; SPD's and flats all in one, multi-purpose mtb touring pedals.

      Jekyll gives you the freedom to ride with normal shoes or with cleats. Jekyll combines a single sided SPD mechanism with a flat pedal body with grip pins on the other. They are ideal for riders who switch frequently from the daily commute to nipping down to the local shop for a pint of milk in their loafers.

      The flat side has 8 replaceable grip pins, 4 mm long, they provide grip in all conditions. When you are ready to get your power on the cleats are just a half rotation away - no swapping your pedals out.

      Jekyll also comes provided with Love Mud 'SH-51 style' cleats.

    Saddles

    • Love Mud Abode Black

    • Love Mud Abode [OEM]
    • Love Mud Kura Black

      +£33.99

    • Love Mud Kura

      Adventure cycling is diverse; in the course of a single trip you can find km's of asphalt, traverse rutted grasslands, weave through thickly forest singletrack, climb loose gravel track or descend steep rocky trails.

      It is unlikely you are going to find a single saddle position for all of this terrain. With this in mind Kura has a flat longitudinal profile with a gentle lateral curvature to give an extended saddle area, allowing you to position yourself around the saddle as you move between road, downhill, and climbing.

      The honeycomb base reduces weight whilst still providing structure and support that adapts and flexes with your motion.

      Titanium rails giving 50 mm of forward and back adjustment to help you find your sweet spot. Titanium is more forgiving than steel so provides a little more comfort.

      Slightly wider than our Adobe saddle, it may provide additional comfort for riders with wider sit bones.

Initial Price
£899.00
Extras
£0.00
Grand Price
£899.00
Go to Checkout
Description

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.

At a glance
  • 6061 aluminium frame
  • Set up as an XC for speed or relaxed for comfort and performance
  • Rockshox Recon RL Silver / 100mm / 29 suspension forks
  • SRAM SX Eagle Groupset / 1 x 12 / 11-50
  • SRAM Level Hydraulic disc brakes
  • Bolt through boost 148mm rear spacing
  • Rear mudguard and pannier rack mounts
  • Sonder Nova 29 Wheelset / Shimano
  • 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.

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.

Reviews
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
Medium
Riders between 5ft 6in and 5ft 10in
Large
Riders between 5ft 9in and 6ft 2in
X-Large
Riders 6ft 2in and over
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 Spec
Build Frontier SX Eagle Recon 29er
Frameset
Frame: Sonder Frontier Frame
Fork: Rockshox Recon RL Silver / 100mm / 29
Headset: FSA Orbit C-40-ACB Headset / 7.8mm Spacer
Seat Clamp: Love Mud Silent Partner / 34.9mm
Group Set
Brake Front: SRAM Level / Direct / 850mm
Brake Rear: SRAM Level / Direct / 1800mm
Rotor Front: Avid Centreline Rotor / 180mm
Rotor Rear: Avid Centreline Rotor / 160mm
Rear Mech: SRAM SX Eagle Rear Derailleur / 12 / Long
Rear Shifter: SRAM SX Eagle Trigger Shifter
Chainset: SRAM SX Eagle Crankset / Powerspline / 170mm / 32
Bottom Bracket: SRAM Powerspline Bottom Bracket / 73mm / 118mm
Chain: SRAM NX Eagle Chain / 118 Links
Cassette: SRAM PG1210 Cassette / 12 / 11-50
Finishing Kit
Stem: Love Mud Piskie Stem / 31.8mm / 55mm
Seatpost: Love Mud Membar / 31.6mm / 400mm
Saddle: Love Mud Abode / Black
Tape/Grips: Love Mud Clutch / Black
Handlebar: Love Mud Aspect Riser
Wheelset
Wheels: Sonder Nova 29 Wheelset / Shimano
Front Tyre: WTB Ranger / Comp / 29 / 2.4
Rear Tyre: WTB Ranger / Comp / 29 / 2.4
Tubes: WTB Inner Tube / 29 / 1.9-2.3
Weight
Frame: S: 1.84kg; M: 1.9kg; L: 1.98kg; XL: 2.03kg
Built: S: TBC; M: TBC; L: TBC; XL: TBC
Pedals not included with full builds
FAQs
TBC
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
Features

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.

Pannier Rack Mount

​Seat clamp mounted pannier attachment points make fitting a rack easier and keep pannier rack rails free from twisting and warping.