An old idea, done right
The Bad Granny has been part of Sour from day one. What started as a fun side project quickly became a permanent fixture in our lineup – not because of nostalgia, but because the concept still makes sense.
The Bad Granny is built around simplicity and adaptability. Singlespeed or gears, rigid or suspension fork, commuter or trail‑curious all‑terrain bike – the frame doesn’t prescribe how it should be used. It simply gives you a solid, well‑considered foundation to build on.
Retro looks, modern thinking
At first glance, the Bad Granny looks like a classic. And that’s intentional.
The proportions and visual language nod clearly to early mountain bikes – bikes that were built to be ridden, not optimized into categories.
Under the surface, however, the Bad Granny is fully modern. Boost spacing, internal dropper routing and compatibility with current drivetrains ensure the frame works seamlessly with today’s components. Electronic shifting, wide‑range gearing or a stripped‑down mechanical setup – all are equally valid.
The geometry stays approachable and confident, favoring intuitive handling and balance over extremes. It feels lively at low speeds and predictable when pushed harder – a result of proportion and intent, not accident.
Fun doesn’t happen by accident
Even on the Bad Granny, nothing is arbitrary.
Tube selection, angles and clearances are chosen to support large tires, calm handling and long‑term durability. Tire volume is part of the design from the beginning, not an afterthought, giving the bike its planted, confidence‑inspiring ride feel.
The Bad Granny works best with a rigid fork, staying close to its roots, but it is also designed to run up to a 120 mm suspension fork for riders who want a more modern setup. Options exist because they make sense – not because they inflate the feature list.
Built by hand, with intent
Like all our frames, the Bad Granny is built entirely by hand in our workshop in Saxony.
Design and construction happen under the same roof. That means mounting points are placed where they belong structurally, tubes are selected for how they behave on the bike, and details are refined while building – not just while drawing.
This process ensures that even a bike designed to feel simple is the result of deliberate decisions.
Café‑ready, trail‑curious
The Bad Granny might not be designed for grand expeditions, but it takes everyday adventures seriously.
From being the most characterful commuter in town to turning local trails, parks and shortcuts into playgrounds, it thrives on mixed use and spontaneous rides. Best enjoyed with good company, a relaxed pace and the quiet confidence that the bike underneath you knows exactly what it’s doing.
