Sonder Black i21 are our carbon performance road wheelset. Designed to maximise speed and improve climbing efficiency, ultimately moving you faster for longer.

They're built to race; eating up the miles year after year on Alpine epics, far-flung British back roads and post-work blasts. Designed, laced and precision-built in the UK.

Unidirectional carbon 32mm low-profile hookless rims with Sapim spokes
Disc brake specific and tubeless-ready design for 25 - 45mm tyres
36-point engagement for quick acceleration and pedalling efficiency
Super lightweight at 1560g a set

We’ve used a super light rear hub with a ratchet drive mechanism that has a 36-point engagement, so the freehub is ready to drive forward with every 10° of rotation. That means there's no lag between you pressing on the pedals and getting drive to the rear wheel. And the more you push the more engaged the drive is and its not affected by any flex in the hub - this is especially important on steeper climbs and when the going gets rough!

Our unidirectional carbon rims tied with Sapim spokes make for super strong wheels at just 1560g a set. Make the most of the weight savings with confidence they'll be able to handle steep climbs, demanding descents and the biggest sprints.

i21 rims are compatible with tubeless compatible tyres only, 28-45mm maximum recommended pressure 72.5psi.

The i21 Black's natural habitat is to race fast an ideal upgrade to your setup if you just want a speed boost on weekend road rides or fast weekday commutes. A lightweight wheel is a game changer when it comes to acceleration, the lower distribution of weight at the rim equals a lower moment of inertia and less effort required to spin the wheels up to speed.

MADE IN BRITAIN

We lace, build and finish all our wheels in our Nottingham factory, with each one getting a full quality control inspection. We’ve brought the build process in house from overseas to enable us to produce something truly special. We can oversee the whole construction of our wheels and keep quality consistent, production efficient and reduce the impact on the planet by not shipping boxes of wheels around the world.

Bike Builder Alpha Race Upgrade

Sonder Black i21 Carbon Aero Wheelset