Sorry, this product has been archived and is no longer available for purchase.

Signal St XT

Aggressive steel 29er hardtail

£2,499.00

The Signal is for flat out speed.

It pedals like an XC bike, descends like an enduro bike, and captures the...

Signal St XT

Photos for illustration purposes. Please check the bike spec for detailed component listings.

Signal St XT

Aggressive steel 29er hardtail

£2,499

A fast and aggressive steel 29er hardtail trail bike with Shimano XT 1x12 groupset and Rockshox Revelation RC fork: the bike that inspires confidence on fast, flowy trails and big mountains.

Read more

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Sorry, this product has been archived and is no longer available for purchase.

Signal St XT

Aggressive steel 29er hardtail

£2,499

A fast and aggressive steel 29er hardtail trail bike with Shimano XT 1x12 groupset and Rockshox Revelation RC fork: the bike that inspires confidence on fast, flowy trails and big mountains.

Buy Now. Deliveries from 20 March.

  • Please select

    colour

    Colour
  • Customise

    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.

    Accessories

  • 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 Sonder 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 Aspect Flat 720mm

      +£0

    • Sonder Aspect Flat [OEM]

      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

    • Sonder Abode Black / 138

    • Sonder 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.

    • Sonder Abode Black / 158

    • Sonder 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.

    • Sonder Zone 133 / Black

      +£29.99

    • Sonder Zone [OEM]

      The Zone is designed for maximum pedalling efficiency and comfort on longer rides, whether on road or off it.

      • Chromoly rails with suspension system
      • Cut-out shape relieves pressure
      • High density foam seat for comfort

      We’ve selected a flat saddle profile that’s long enough to allow for lots of micro-adjustments to your riding position over the course of a full day on the bike. The nose width allows you to move forward over the pedals on climbs and sprints, and a tapered back enables you to get behind the saddle easily for switchback descents or technical off-road sections.

      We’ve chosen a nylon fibre saddle base to provide a stiff and stable pedalling platform for a low overall weight. This base is connected to the chromoly rails using a patented suspension system that reduces road buzz and improves comfort without compromising on support.

      High density foam stays comfortable for longer, adding to the saddle’s supportive platform. And a long central cut-out in the middle of the Zone relieves pressure on the perineum, allowing you to ride for longer.

    • Sonder Kura

      +£34.99

    • Sonder Kura [OEM]

      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.

    Seatpost

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

    • 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 31.6mm / 150mm

    • 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 31.6mm / 170mm

    • 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.

    • RockShox Reverb / 125mm Drop / 31.6 x 390mm

      +£49.99

    • RockShox Reverb / 125mm Drop / 31.6 x 390mm

      The RockShox Reverb provides effortless actuation and increased reliability featuring new Vent Valve Technology.

      With reduced overall post lengths and new travel options, riders of all shapes and sizes benefit from more travel than ever before. The Reverb Stealth is just really, really reliable at simply going up and down.

    • RockShox Reverb / 150mm Drop / 31.6 x 440mm

      +£49.99

    • RockShox Reverb / 150mm Drop / 31.6 x 440mm

      The RockShox Reverb provides effortless actuation and increased reliability featuring new Vent Valve Technology.

      With reduced overall post lengths and new travel options, riders of all shapes and sizes benefit from more travel than ever before. The Reverb Stealth is just really, really reliable at simply going up and down.

    Stem

    • Sonder Piskie / 31.8mm / 55mm 31.8mm / 35mm

    • Sonder Piskie [OEM] / 31.8mm / 55mm
    • Sonder Piskie / 31.8mm / 55mm 31.8mm / 45mm

    • Sonder Piskie [OEM] / 31.8mm / 55mm
    • Sonder Talo 35

      +£34.99

    • Sonder Talo

      Talo is a sturdy CNC machined aluminium performance mountain bike stem with four bolt clamp to hold your bar firmly in place.

      Opposing bolts on the steer tube clamp give extreme clamping power while reducing stress on the steer tube. Machining shaves unnecessary weight to specifically engineer it for trail and all-mountain riding.

      It's built for the trail and stiff for its weight to give precise and immediate handling.

      • compatible with all 31.8mm handlebars and 28.6mm steerer tubes
      • 0° rise
      • 6061-T6 aluminium construction
      • Weighs just 127g (35mm length)
      • Available in 35mm and 45 mm lengths

      The humble stem has a significant effect on your bike's geometry and as a result its performance and your comfort. A shorter stem results in faster handling and a more upright riding position. Longer stems increase reach with slower more predictable handling.

      Experiment with different length stems or get a pro bike fit to hone your perfect set-up.

      Note. The length of a stem isn’t its overall length, from the very front to the very back, but the distance from the central point on the steerer tube and the centre of the handlebar.

       

    • Sonder Talo 45mm

      +£34.99

    • Sonder Talo

      Talo is a sturdy CNC machined aluminium performance mountain bike stem with four bolt clamp to hold your bar firmly in place.

      Opposing bolts on the steer tube clamp give extreme clamping power while reducing stress on the steer tube. Machining shaves unnecessary weight to specifically engineer it for trail and all-mountain riding.

      It's built for the trail and stiff for its weight to give precise and immediate handling.

      • compatible with all 31.8mm handlebars and 28.6mm steerer tubes
      • 0° rise
      • 6061-T6 aluminium construction
      • Weighs just 127g (35mm length)
      • Available in 35mm and 45 mm lengths

      The humble stem has a significant effect on your bike's geometry and as a result its performance and your comfort. A shorter stem results in faster handling and a more upright riding position. Longer stems increase reach with slower more predictable handling.

      Experiment with different length stems or get a pro bike fit to hone your perfect set-up.

      Note. The length of a stem isn’t its overall length, from the very front to the very back, but the distance from the central point on the steerer tube and the centre of the handlebar.

       

  • Forks

    • Rockshox Revelation RC / 29 / 130mm 29 / 130mm

    • Rockshox Revelation RC / 29 / 130mm
    • RockShox Pike Ultimate RCT3 / 29 / 130mm 29er / 130mm

      +£214.99

    • RockShox Pike Ultimate RCT3 / 29 / 130mm
    • Cane Creek Helm MK2 Air / 29 / 130mm 130mm

      +£374.99

    • Cane Creek Helm MK2 Air / 29 / 130mm
  • Tubes

    • WTB Inner Tube / 29 / 2.4 - 2.8 Black

    • WTB [OEM] Inner Tube / 29 / 2.4 - 2.8
    • Tubeless Tyre Upgrade and Setup

      +£44.99

    • Tubeless Tyre Upgrade and Setup

      Go tubeless

  • Lights accessories

    • No Bike Light Accessories (none)

    • No Bike Light Accessories
    • Helmet Mount Black

      +£4.99

    • Helmet Mount

      The Helmet Mount allows you to attach your Alpkit bike light to your helmet so you can scan the trail ahead and fly round sharp bends without having to wait for your handlebar light to catch up.

      The Velcro straps thread through your helmet vents and a three-pronged pivot with screw tightener allows you to adjust your lighting angle securely. The Helmet Mount is compatible with the Phase 400, Phase 800, Ariel, Hadron.

    • Cockpit Mount Black

      +£15.99

    • Cockpit Mount

      The Cockpit Mount combines two mounts on one arm so your bars aren’t covered in devices. Sticking out front, the twist lock Garmin mount makes it easier to route find and operate on the move. And you can attach your bike light underneath so your screen isn’t affected by any glare.

      The arm positions both your lights and GPS more centrally and is made from durable aluminium. The bracket attaches with screws and comes with an assembly pack so you can fit it securely. The Cockpit Mount fits the Phase 400, Phase 800, Ariel and Hadron lights.

  • Bottle cages

    • No Bottle Cages (none)

    • No Bottle Cages
    • Sonder Sideblade Black / Left Entry

      +£5.99

    • Sonder 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!

    Lights

    • No Lights (none)

    • No Lights

      -

    • Tau Front

      +£12.99

    • Tau

      Bright enough to blind you when you turn it on so you can be sure that other road users will also see you.

      Tau+ front safety light offers 65 lumens of 270° ultra wide lighting with 10 m beam distance.

      Tau- rear safety light will shed out 20 lumens of 270° ultra wide lighting from the red COB LED strip

      Tau is visible from up to 100 m and is water resistant so they will happily brighten your way even on the gloomiest of days and is impact resistant from 1 m.

      Switch protection prevents any unwanted battery usage and battery capacity indicator will let you know when the juice is running low.

      Only 22g including the USB rechargeable battery and LED lights that never need replacing will keep you light and bright for years to come!

      Each Tau light comes with a bigger and a smaller strap to fit with most bars/seat posts and if you need it even bigger, just lace the bands together to make a larger loop.

    • Phase / 400

      +£19.99

    • Phase / 400

      The Phase 400 is our lightweight, yet durable, rechargeable bike light for a midweek evening blast on the bike.

      • 5 lighting modes and a 200m beam distance
      • Versatile: can be attached to handlebar, helmet or cockpit mount
      • Rechargeable Li-ion battery, with micro-USB cable

      Say hello to our sleek, new bike light range: they’re light, durable and rechargeable (and they say hi back). At just 123g, the Phase 400 is the final tool you need to make the most of evening rides. With 400 lumens and >200m beam distance, a Phase bike light will keep you company and confident on your dusk rides.

      The Phase 400 has been made with the roadie in mind: whether you’re on a family ride, a mid-week spin or your daily commute to work, you’re going to need an all-round bike light for the incoming dark evenings. But don’t worry if you end up on a canal path or a gravel track, this rechargeable light will suit you just fine for a short jaunt off-road.

      Flick between 5 lighting modes: high, mid, low, SOS and strobe. The Phase 400 has a maximum battery life of 8 hours and 20 minutes in low mode, so in the case of a surprise night-time emergency, you’re sorted. The 80-degree beam angle ensures you can see and be seen.

      We’ve added in some nifty features, including memory lighting. The light will remember the most recently used mode and default to it the next time you head out on your bike. The Phase 400 is compatible with a handlebar mount (included), a cockpit mount and a helmet mount. It also conveniently charges with a versatile micro-USB cable.

    • Boson

      +£29.99

    • Boson

      A powerful bike light with tough aluminium shell suitable for mountain biking and road biking. Boson is small and compact with a Li-ion rechargeable battery and a Micro USB port.

      Boson has 5 lighting modes which are cycled through (excuse the pun) with a single illuminated switch. High power pumps out 850 lumens making even the darkest commute a tunnel of light. Turn it down to medium power and you still have 320 lumens to play with - more than enough for negotiating un-lit cycle ways and paths.

      If you want to be seen rather than see where you are going switch out to the 6 or 3 Hz flashing modes. Bright enough to be seen even during daylight hours, it really comes into its own during the hours of twilight and dusk.

      A mounting bracket is included (fits 18 - 36 mm bars and no special tools needed). Once attached Boson can be fixed or removed with ease. It allows 360 degree rotation for complete control over your beam of light; the textured lens projects a smooth wide beam ideal for nocturnal riding.

      Note: Boson doesn’t take a "standard" 18650 battery - the battery has both anode and cathode at the same end. Do not switch on Boson during charging as it could damage the battery.

    • Hadron

      +£69.99

    • Hadron

      At a whopping 1,800 lumens, the Hadron shines like two twin suns on the front of your bars, allowing you to ride at daytime speeds long after the light fails.

      • Max power of 1,800 lumens with a wide beam angle
      • 6 different lighting modes to tailor to your riding
      • Remote control for swapping between modes at speed

      The Hadron uses twin Cree LEDs to provide a wide, bright beam that stretches well over 200m. This provides a ridiculous amount of night-time visibility so you can tackle tight and twisty singletrack at speed. It also comes with an optional remote control, allowing you to easily swap between lighting modes without needing to take your hands off the brake levers.


      With 6 different lighting modes, the Hadron’s brightness can be effectively tailored to your ride length, terrain and light levels. The lowest brightness Pulse mode runs for a massive 50 hours If you need to save battery on the roads or smoother sections. Plus, the twin bulbs are much more energy efficient than single bulb set-ups.


      The Hadron is housed in a durable 6063 alloy casing to protect your light from crash damage and an IPX6 rating is sufficiently waterproof for all-weather riding. An output jack on the Hadron means you can also use its large 6,700mAh lithium ion battery to charge your GPS or phone if you find yourself out of juice on mid-trip.

    Mudguards

    • No Mudguards (none)

    • No Mudguards
    • Sonder Fender Front MTB

      +£4.99

    • Sonder Fender

      The Sonder Front Fender protects you from excessive mud splatter on wet, mucky trails. These lightweight plastic mudguards don’t require any special fixings on your bike and can be strapped straight onto your forks with 4 cable ties (supplied).

      Made from durable polypropylene, if the Fender does meet its end, it can be easily recycled by most councils or at your local recycling centres.

    Pedals

    • No Pedals (none)

    • No Pedals
    • Sonder Reko

      +£50.99

    • Sonder Reko

      The Reko are lightweight SPD pedals designed gravel riding and cross-country mountain biking over longer distances.

      The Reko's platform-free design reduces the overall weight of the pedals to 145g per pedal for lighter, faster riding. Double-sided SPD bindings are easy to clip in and out of and their compact design means they're less likely to clog with muck on filthy winter rides.

      The clip-in design improves the efficiency of your pedal strokes, saving energy on long rides and improving power transfer on climbs, and gives you more control of the back end of the bike.

    • Sonder Jekyll Black

      +£59.99

    • Sonder 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 Sonder 'SH-51 style' cleats.

    • Sonder Slingshot Black

      +£59.99

    • Sonder Slingshot

      The wide platform Slingshot pedal is designed to provide the support, control and confidence you need for a variety of riding, whether on trail, gravel or road.

      • Wide 87x90 platform made from 6061 aluminium
      • Double-sided adjustable SPD clips
      • Chromoly axle with sealed bearings

      The Slingshot's wide foot platform provides plenty of support to the foot for more comfortable pedalling over long distances, reducing hot-spots. This additional foot support also gives you greater control of the rear end of the bike on tight turns or technical trail.

      If you're using the Slingshot for mountain biking, the pedal's wide surface gives you a platform to stand on unclipped, ready to bail out if needed, on heart rate-quickening sketchy sections.

      With double-sided SPD clips and a large pedal area, the Slingshot is easy to clip in and out of in a hurry. A clipless system provides greater pedalling efficiency when climbing and more control when descending.

    • Sonder Torque Black

      +£29.99

    • Sonder Torque
Initial Price
£2,499
Frame
Signal St XT
Size
Colour
Extras
£0
Total Price
£2,499
Description

The Signal is for flat out speed.

It pedals like an XC bike, descends like an enduro bike, and captures the rawness of riding a hardtail on fast, flowy singletrack. Stand up, sprint, and ride it hard on the groomed trails at Llandegla and Glentress or take it to big mountains and let loose.

At a glance

  • Shimano XT M8100 12-speed groupset
  • Rockshox Revelation RC fork
  • Sonder Alpha 29" UK made wheelset
  • X-Fusion Manic dropper seatpost

That low BB and long wheelbase gives a planted and stable feel through the corners and when tackling high speed descents. The low stack height leaves you with less of that ‘tall’ 29er feeling – you’ll feel like you’re 'in' the bike, not on the bike.

Big wheels roll faster. The 29" wheels can be paired with 2.2 to 2.6in tyres with clearance for winter conditions.

The Signal Steel rides beautifully – it’s got that distinctive steel feel to take the edge off the biggest hits while keeping stiffness where it counts so you can accelerate out of corners and track accurately through rocks and roots.

Why XT?

Shimano drivetrains are designed, engineered and manufactured to work as complete drivetrain systems. Shimano's new microspline hub means that you can run a 10 tooth cassette for a huge gear range. The new EV shifters and brakes provide loads of adjustment to get the perfect position as well as a rock-solid feel on the bars. And the 4-pot brakes provide consistent and reliable stopping power.

Features

Aggressive trail geometry

​Neil has designed the Signal St to suit his aggressive riding style. A low bottom bracket makes it corner like its on rails, a spacious reach gives you room to move around on the bike, and the 66/74 head and seat angles give you the confidence to bomb the descents and while still being able to climb like a mountain goat.

Steel Frame

Nothing feels quite so good as the famously springy and durable Steel. Signal St’s 4130 Chromoly, Hand Welded Steel tubing absorbs shock to soften the ride without any loss to feel or speed.

2.6” tyre clearance

​Bucketloads of clearance for 2.6” tyres gives you the benefits of higher volume tyres without getting clogged up in UK conditions.

Build Spec
Frameset
Frame:Signal St Frame | Steel
Fork:RockShox Revelation RC | 130mm (travel)
Headset:FSA Orbit C-40-ACB
Groupset
Shifters:Shimano XT M8100 | 1x | 12-speed
Brakes:Shimano XT M8120 | Hydraulic | Post mount
Rotors:Shimano RT66 | 180mm (front), 160mm (rear) | 6-bolt
Rear derailleur:Shimano XT M8100 | Long cage | 12-speed
Chainset:Shimano XT M8100 | 170mm | 32t
Cassette:Shimano XT M8100 | 10-51t | 12-speed
Chain:Shimano SLX | 12-speed
Bottom bracket:Shimano MT800 | BSA
Wheelset
Wheels:Sonder Alpha 29" UK Made
Front tyre:Goodyear Newton MTF Trail Tubeless | 29 x 2.5" | Black
Rear tyre:Goodyear Newton MTR Trail Tubeless | 29 x 2.4" | Black
Tubes:WTB | 29 x 2.4-2.8"
Finishing kit
Handlebars:Sonder Aspect Riser | 78cm
Stem:Sonder Piskie
Seatpost:X-Fusion Manic | 31.6mm
Saddle:Sonder Abode
Grips:Sonder Clutch | Black
Weight
Frame:S: 2.91kg; M: 3.0kg; L: 3.01kg; XL: 3.02kg
Build:
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 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
X-Large: Riders of 6ft 2in +

Size Small Medium Large X-Large
ST - Seat tube 400 425 465 485
ETT - Effective Top Tube 585 606 634 664
HT - Head tube 100 105 115 125
HA - Head angle 66 66 66 66
SA - Seat tube angle 74 74 74 74
CS - Chainstay 425 425 430 435
BB - BB drop 65 65 65 65
FO - Fork offset 42/51 42/51 42/51 42/51
WB - Wheelbase 1127 1149 1183 1220
SO - Standover 730 738 760 772
RE - Reach 420 440 465 495
SK - Stack 601 606 615 624
Tyre
Frame Spec

Steel 29er hardtail mountain bike

Weight: S: 2.91kg; M: 3.0kg; L: 3.01kg; XL: 3.02kg
4130 Chromoly, Hand Welded Steel frame
148mm boost thru axle standard
Clearance for 2.6” tyres
Headset: IS42/28.6 | IS52/40
73mm BB shell
External cable routing for brake and gear cables
Stealth dropper routing
31.6mm seatpost diameter, 34.9mm clamp
Optimised for 130mm travel suspension fork (42 or 51mm offset)

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