Sonder Vir Fortis GX Eagle

Sonder Vir Fortis GX Eagle

Full carbon fat bike

£2,099.00

When you want to go places a regular skinny bike won’t, go you need a hero. Enter Vir Fortis, a bike made for terrain that may never have been navigated on two wheels, crushing turnips, or for just in case you get snowed in and need to save the neighbourhood.

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All Sonder bikes are built to order and can be customised. Our build time is currently 5 weeks.

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

    Configure your Frame

    size

    • Small

    • Medium

    • Large

  • 1. components

    Handlebar
    Sonder Aspect Riser 780mm
    Saddle
    Love Mud Abode
    Seatpost

    Configure your 1. components

    Handlebar

    • Sonder Aspect Riser 780mm

    • Sonder Aspect Riser [OEM]

      In general riser bars tend to be wider than flat bars and may have slightly more flex to give a more forgiving ride. As you go into descents and your arms drop below your knees the additional height gained on your front end will help you take control of the steep descents.

      That said you can get all bar types in a range of widths and stiffnesses and front end height can be adjusted with spacers like our Love Mud Rings, so sometimes you just have to ignore the mumbojumbo and make your call on style and personal preference and there is nothing wrong with that.

    • Sonder Confucius

      +£19.99

    • Sonder 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!

    Saddle

    • Love Mud Abode

    • Love Mud Abode [OEM]

      High density foam padding over a plastic base provides comfort and longevity. A v-shaped split at the rear of the saddle allows flex as you are riding, increasing shock absorbancy and reducing pressure on the spot between your sit bones.

      Scooped up at the back with a slight rise towards the nose the longitudinal profile provides a cupped, craddled seating position, a timeless, proven design for distance on and off the road or climbing in the mountains.

      Stainless steel rails give 50 mm of forward and back adjustment to help you find your sweet spot.

      All our Sonder bikes come with Abode fitted as standard.

    • Love Mud Kura

      +£19.99

    • 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.

    • Brooks Cambium C17 Saddle / All Weather / Black

      +£49.99

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

      +£49.99

    • Brooks Cambium C17 Saddle [OEM] / All Weather / Brown
    • Brooks Cambium C17 Saddle / All Weather Carved / Black

      +£54.99

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

    Seatpost

    • X-Fusion Manic Drop Seatpost and Lever 31.8mm / 125mm

      +£119.99

    • X-Fusion Manic Drop Seatpost and Lever

      The X-Fusion Manic Dropper has been designed to work well across cross-country, trail, all mountain and enduro riding.

      It works on a simple design. Inside you’ll find a closed cartridge that is both sealed and designed to be easily removable from the rest of the post. Simple construction aside, the action of this post feels super-smooth and silky.

    • X-Fusion Manic Drop Seatpost and Lever 31.8mm / 150mm

      +£119.99

    • X-Fusion Manic Drop Seatpost and Lever

      The X-Fusion Manic Dropper has been designed to work well across cross-country, trail, all mountain and enduro riding.

      It works on a simple design. Inside you’ll find a closed cartridge that is both sealed and designed to be easily removable from the rest of the post. Simple construction aside, the action of this post feels super-smooth and silky.

    • Cane Creek Thudbuster / Short Travel / 31.6mm / Black

      +£99.99

    • Cane Creek Thudbuster / Short Travel / 31.6mm / Black

      The Thudbuster includes 50mm of travel to significantly diminish shocks and impacts from broken pavement, cobblestones or any other mixed surfaces.

      The Thudbuster supports riders up to 150kg and incorporates a tool-free, interchangeable elastomer system to quickly and easily adjust the seat post for a variety of rider weights. Installing and adjusting your saddle on the Thudbuster is easy with a single bolt design that secures the seat with a few turns of a standard allen key. 

  • 4. pedals

    Pedals
    No Pedals

    Configure your 4. pedals

    Pedals

    • No Pedals (none)

    • No Pedals
    • Shimano M520 Pedal Black

      +£39.99

    • Shimano M520 Pedal
    • Shimano RS500SL Pedal Black

      +£39.99

    • Shimano RS500SL Pedal
    • Shimano A530 Pedal Black

      +£39.99

    • Shimano A530 Pedal
  • 5. accessories

    Bottle cages
    No Bottle Cages
    Mudguards
    No Mudguards

    Configure your 5. accessories

    Bottle cages

    • No Bottle Cages (none)

    • No Bottle Cages
    • Love Mud Sideblade Left Entry / Black

      +£4.99

    • Love Mud Sideblade
      The Sideblade bottle cage not only gives your water bottle a lovely, secure hug, but its side loading system makes it easier to access when you need a drink, making staying hydrated a joy even when you've got a load of frame bags to work around!

      The Side blade is geared at letting you get to your water when you've got a bike packed up with frame bags, this means that it's also ideal for compact and full-sus frames where a standard loading bottle cage system just won't fit, you can choose which side you'd like to access your bottle by with a twist of the cage in the mount before your ride.

      Made of polycarbonate, the Sideblade is also super light and super duper tough - hooray!
    • Sonder Buzz Wire Single

      +£3.99

    • Sonder Buzz Wire [OEM]

      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!

    • Sonder Buzz Wire Pair

      +£6.99

    • Sonder Buzz Wire [OEM]

      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!

    Mudguards

    • No Mudguards (none)

    • No Mudguards
    • Love Mud Fender Reg / Set

      +£4.99

    • Love Mud Fender

      Smashing through puddles and over marshy ground can be great fun, but getting a face full of bog water certainly isn’t. 

      You can avoid a wet face with a Love Mud Front Fender. These lightweight plastic mudguards don’t require any special fixings on your bike and can be strapped straight onto your forks.

      Keep the dirt out your eyes so you can focus on the important things, having a great ride.

      If you don’t have the muddy equivalent of a duck's back then the Love Mud Rear Fender is the perfect product for you.

      If you love blasting down muddy trails but don’t like that wet mucky streak up your back quite as much, then the the Love Mud Rear Fender might be exactly the thing you’re after. This lightweight plastic mud guard keeps splashes and spray off your back and doesn’t need any special fixings to attach to your bike. Simply fitted to your seat post and with a couple of ties under the saddle. You can pop it on your bike with minimal fuss and you’re ready for even the wettest ground.

    • SKS Commuter Mudguard Set 28 / 45mm / Black

      +£29.99

    • SKS Commuter Mudguard Set

      High quality, full length mudguard set with high quality, stainless-steel fittings.

      Fitted by us so you don't have to go through the pain!

    • SKS Bluemels Mudguard Set 28 / 53mm / Black

      +£29.99

    • SKS Bluemels Mudguard Set
Initial Price
£2,099.00
Extras
£0.00
Grand Price
£2,099.00
Go to Checkout
Description

Vir Fortis is designed to go anywhere, big tyres and big wheels gives a massive amount of traction.

Vir Fortis is not just strong, it is light too: a medium frame weighing in at just 1550g and letting you float over the wildest trails like a cloud. It looks sharp: cables are routed internally to avoid snagging and keep things clean, and a single mounting point on the downtube gives you the option to add a bottle cage.

With a race-winning pedigree, Vir Fortis inspires you to explore the outer boundaries of the trails. Its slackened off geometry gives a characterful ride and is compatible with tyres up to a chunky 4.8”. It’s carbon frame and fork gives precise handling and trail bike feel.

It has taken on some of the roughest rides in the wildest terrain, and come out on top.

At a glance
  • Fat, light, and comfy for wilderness exploration
  • Frame: Sonder Vir Fortis, high grade T700 carbon
  • Groupset: SRAM GX Eagle / 1 x 12 / 10-50
  • Brakes: SRAM Guide R
  • Fork: Vir Fortis, high grade T700 carbon
  • Seatpost: Love Mud Membar, 31.6 mm
  • Wheelset: Love Mud Hurlyburly
  • Tyres: Schwalbe Jumbo Jim / 26 / 4
Reviews
Geometry and Sizing

Sizing

It is important to get the right size bike, if the bike fits it will be faster, more comfortable and easier to handle. You can also take into consideration the standover height to ensure you pick a bike that will be a good fit. If you measure your inside leg and ensure there is a minimum of an inch from the toptube to your crotch this will give you enough seatpost adjustment to find your optimum saddle height. 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
Size Small Medium Large
ST - Seat tube 406 457 505
TT - Top tube 580 605 625
HT - Head tube 100 110 130
HA - Head angle 68.5 68.5 68.5
SA - Seat angle 73.5 73 73
CS - Chainstay 445 445 445
BB - BB drop 60 60 60
FO - Fork offset 45 45 45
WB - Wheelbase 1103 1123 1145
SO - Stand over
RE - Reach 406 423 437
SK - Stack 586 595 614
Build Spec
Build Vir Fortis GX Eagle
Frameset
Frame: Sonder Vir Fortis Frame
Fork: Sonder Vir Fortis Fork
Shock:
Headset: FSA Orbit C-40-ACB Headset / 7.8mm Spacer
Seat Clamp: Love Mud Silent Partner / 34.9mm
Group Set
Brake Front: Sram G2 R / 950mm
Brake Rear: Sram G2 R / 2000mm
Rotor Front: Avid Centreline Rotor / 180mm
Rotor Rear: Avid Centreline Rotor / 160mm
Rear Mech: SRAM GX Eagle Rear Derailleur / 12 / Long
Rear Shifter: SRAM GX Eagle Trigger Shifter
Chainset: SRAM GX Eagle Fat Crankset / 175mm / 30T
Bottom Bracket: SRAM Bottom Bracket / Fat
Chain: SRAM GX Eagle Chain / 120 Links
Cassette: SRAM XG1275 Eagle Cassette / 12 / 10-50
Finishing Kit
Stem: Love Mud Piskie Stem / 31.8mm / 35mm
Seatpost: Sonder Membar / 31.6mm / 400mm
Saddle: Sonder Abode / Black
Tape/Grips: Love Mud Clutch / Black
Handlebar: Sonder Aspect Riser
Wheelset
Wheels: Love Mud Hurlyburly Wheelset
Front Tyre: Schwalbe Jumbo Jim / 26inch / 4
Rear Tyre: Schwalbe Jumbo Jim / 26inch / 4
Tubes: Schwalbe Fat Inner Tube / 26inch / 3.5-4.8
Weight
Frame: TBC
Built: TBC
Pedals not included with full builds
FAQs
TBC
Frame Spec
Carbon is the most versatile material for building a bike frame, not only can you mold it to look exactly how you want, you can also layer it up differently to affect the ride characteristics. This allows us to build frames that are stiff in the areas they need to be and have the right amount of compliance in others making for an incredibly lively but comfortable ride.
Frame Weight: S: TBC; M: TBC; L: TBC
Fork Weight - uncut: TBC
Toray T700 carbon fibre
Headset: IS42/28.6 | IS52/40
Seat post: 31.6 mm
Seat tube OD: 34.9 mm
100mm BSA BB shell
Features

Hand laid carbon fibre frame and fork

Using Toray’s highest grade of carbon, T700, this frame is manufactured in a clinical environment to the highest standards. The result is an extremely strong, lightweight frame that is a blast to ride! Guaranteed for 5 years

Trail bike inspired geometry

The Vir Fortis take fun to the next level by slackening the bike out a bit, giving it a more relaxed, playful character. With natural air suspension from the enormous tyre volume Vir Fortis is ready to roll over all terrains.

Internally tapered head tube

Who would choose to be a head tube? You might as well step into the ring with Mike Tyson. It is a critical junction point where forces are distributed around the frame and steering precision is won or lost. Vir Fortis uses a fully integrated internal headset and a fork with a tapered carbon steerer tube to make sure you hold your line over broken ground.

Disk brake compatible

​Once rolling you will be surprised by how you can carry your momentum which is why you are going to be thankful for the stopping power of disc brakes. The Vir Fortis carbon frame is fully compatible with disc brakes.

High spec builds

If you’ve a dream build in mind, please get in touch and we’ll do our best to source the parts you want.