Signal Ti Pinion

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

Signal Ti Pinion

Titanium aggressive hard tail 29er mountain bike


An aggressive titanium 29er hardtail trail bike with Pinion 12 speed gearbox and Cane Creek Helm-Air fork: the bike for flat-out speed and sessioning the groomed trail centre trails

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Stock arriving Mid 2022


The Signal is fast, it’s 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 groomed descents at Llandegla and Glentress or take it to the big mountains and get loose.

Every Signal Ti Pinion is built to order. This means the geometry, the tube lengths, the specification, everything is chosen exactly for you, your partner and the journeys you'll take together.

It takes six months from the first conversations we have with you to getting your Signal Ti Pinion for your first ride. In this time we'll talk exactly about what you need and where you're going so that we can design and build your perfect tandem. It's actually a joyful six months, filled with the involvement of having a bike built especially for you, knowing the care and complete obsession over the detail that's going into it. Neil and our team of designers and builders are in touch every step of the way. It's a truly special experience.

At a glance
  • Fast and aggressive titanium 29er hardtail trail bike
  • Frame: Signal Ti aeronautical grade titanium frame, custom options available.
  • Fork: Cane Creek Helm-Air / 29 / 130mm / Gunmetal Grey
    Brakes: SRAM Guide R
  • Gearbox: Pinion C1.12 Gearbox Shifter Crank Set
  • Rims: Love Mud Hobo 29er Wheelset / XD
  • Clearance for up to 2.6" tyres

That low BB and long wheelbase gives a planted and stable feel through the corners and on 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 in wheels can be paired with 2.2 to 2.6ins tyres with clearance for winter conditions.

The titanium Signal frame is stiff, light and durable. 3Al 2.5V Aeronautical grade titanium tubing softens trail buzz and provides the engaging and lively feel that only Titanium can.

Why Pinion?

The pinion version of the Signal puts all the moving parts of the gear system out of harm’s way and gives an almost silent, well-balanced ride.

It’s a low maintenance dream - you can cover 10,000km before you need to think about an oil change. The range of gears is just enormous (600%) and because of the way the gearbox works you can dump all of them in one go if you get caught out at the bottom of a brutal climb. It’s an amazing experience.

All the weight of the gears are low and central with a pinion gearbox so handling of the Signal Pinion is beautifully balanced and assured.


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.

Aggressive trail geometry

​Neil has designed the Signal Ti 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.

Guided internal cable routing

​Guided internally routed cables for a clean look and silent ride.

Titanium frame

Nothing looks quite so good as the famously resilient and durable titanium. Signal Ti’s aeronautical grade titanium tubing absorbs shock to soften the ride without any loss to feel or speed. ​

Custom available

​We can customise any aspect of our Ti bikes. Come to us with what you want and Neil will make it happen.

Build Spec
BuildSignal Ti Pinion
Frame:Sonder Signal Pinion Frame
Fork:Cane Creek Helm-Air / 29 / 130mm / Gunmetal Grey
Headset:FSA Orbit C-40-ACB Headset / 7.8mm Spacer
Seat Clamp: 
Group Set
Brake Front:SRAM Guide R / 950mm
Brake Rear:SRAM Guide R / 1800mm
Rotor Front:Avid Centreline Rotor / 180mm
Rotor Rear:Avid Centreline Rotor / 160mm
Gearbox:Pinion C1.12 Gearbox
Chainset:Pinion Forged Cranks / 170mm / 30t
Cassette:Pinion Rear Chainring / 30t
Shifter:Pinion Rotary Shifter
Chain:Pinion X1 Chain
Finishing Kit 
Seatpost:RockShox Reverb / 125mm Drop / 31.6 x 390mm
Saddle:Sonder Abode / Black
Tape/Grips:Sonder Clutch / Black
Handlebar:Love Mud Aspect Riser
Front Tyre:WTB Vigilante / Light High Grip / 29 / 2.5
Rear Tyre:WTB Trail Boss / Tough Fast Rolling / 29 / 2.4
Tubes:WTB Inner Tube / 29 / 1.9-2.3
Built:S: 12.4 kg; M: 12.65 kg; L: 13.8 kg; XL: 13.9 kg
Pedals not included with full builds
Geometry and 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:
Riders between 5ft 2in and 5ft 7in
Riders between 5ft 6in and 5ft 10in
Riders between 5ft 9in and 6ft 2in
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 430-450 430-450 430-450 430-450
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 412.5 432.5 457.5 485
SK - Stack 601 606 615 624
Frame Spec

Titanium 29er hardtail mountain bike frame 

Weight (kg): Approx. 2kg depending on size
3Al/2.5V Aeronautical Grade Hand Welded Titanium Frame
148 mm boost thru axle standard
Clearance for 2.6” tyres
IS42.IS52 headset to give low stack height
Internal, fully guided cable routing
Stealth dropper routing
31.6 mm seatpost diameter, 34.9 mm clamp
Optimised for 130 mm travel suspension fork (42 or 51 mm offset)
Neil Cottam Reviews the Sonder Signal Ti

It is possibly the best all-round trail hardtail that I've ever ridden, I wanted to be out riding on it all the time - that is the mark of a good mountain bike.

Read the full review here.

Singletrack Review the Sonder Signal Ti

You know that rock garden that you’ll happily hop into on your full bounce bike? Well, the Sonder will do it too, only you’ll probably lift the front end higher, get airborne further and completely clear the whole lot...

Read the full review here.