Limited Edition!
We’re bringing back the Bad Granny and to celebrate we’ve got a rusty klunker kit ready to roll.
Limited to 10 sets, so get on it while you still can! Once it’s gone, it’s gone.
The Bad Granny is back baby!
After a years long hiatus, the Bad Granny has just slammed the double swinging doors open and proclaimed “this town ain’t big enough for the both of us”! To celebrate the return of the Bad Granny, we’ve teamed up with Cyber Cycles and Brainfart Industries to make sure this bikes re-entry into our atmosphere is as spectacular as the bike rides, looks, and just generally “is”.
This limited edition Bad Granny is delivered as raw as the day it was born. Together with Brainfart Industries and Cyber Cranks we’ve curated the most ready-to-klunk Bad Granny build we’ve ever dreamt up. Raw steel cranks, raw steel bars with integrated dropper. Perfect.
The Bad Granny has been around since day one here at Sour. We wanted a fun side-project, and an homage bike seemed like a perfect fit. Singlespeed it, run gears, race it, ride it, commute it, it’s up to you! This frame can handle it all, as long as “all” ends with a cool beverage and good company.
The Bad Granny looks the same as the OG mountain bikes, but it is anything but ancient. Boost spacing, internal dropper routing, and all the other modern day standards are present and accounted for on this frame… no worries about running fancy robo-shifting if that’s your thing!
All of this, built by hand in Saxony!

Don’t Call it Old Fashioned
Sure, the Bad Granny might look like a barn find from 1970’s in Marin County, and although we stuck to more “retro” geometry and looks, the Bad Granny is at home on everything from café rides to modern trails. Granted, a bike like this is really best ridden with a rigid fork, it is also ready to run a 100mm suspension fork if that’s your thing.
Café Ready Technology™
A lot of our bikes are designed with big adventures in mind. Big rides, big climbs, or even big goals of riding your bike to work everyday for a month! The Bad Granny is no different.
However, instead of trans-continental journeys, we were more thinking of trans-local-trails-and-then-hit-the-café kind of adventures. Wake up early suit up in your most appropriate Vans and baggies, and head out into the wild world… who knows what could happen in the hour or two between the trailhead and the local beverage-terrace, better bring provisions!
Jokes aside, we’ve seen tons of Bad Granny frames built up into the coolest commuter in town, but we’ve also seen lot’s of them built up into what can only be described as an ATB. I know, I know, it’s wild, but the geometry can really truthfully only be described as: will shred.
Brainfart Industries

Flori, aka Brainfart Industries will “make anything once”, so it took quite some convincing for Flori to want to make all ten custom steel 22.2mm bars for the limited Bad Granny with integrated dropper remotes. We can’t promise that every bar might be a little bit different and every remote with a different shape. Who knows!
Cyber Cycles and Actofive

Cyber Cycles and Actofive are both friends of Sour Bicycles and have agreed to combine their powers to build a sweet crankset and chainring combo. Enjoy the beauty of the Actofive chainring and the earned patina of the raw steel cranks.