Usually grandparents have different functions in a child’s live. In this case our Bad Grannyis here to remind you that singlespeed, rigid forks and a laid-back geometry is everything you need, to have the most fun on a bike. However, Bad Granny always keeps up with the times, derailleur shifting, suspension forks, even internal or external dropper posts comes beside the old-fashioned style…she can handle it all.




Handmade Sour Bicycles CrMo frame

Tubing: heat treaded, multiple butted tubing with ed-black coating

Dropouts: 12mm x 142mm thru axle

Seat clamp: 35.0 external

Headtube: 44 mm

Bottom bracket: 68 mm BSA with eccentric shell

Axle: 12 mm x 142 mm thru axle

Seatpost: 31.6 mm

Brake standard: IS2000 disc

Recommended fork travel: 80 mm – 100 mm

Wheel size: 650b x 2.4“ / 29“ x 2.3

More facts:

Dropper post routing Two water bottle options


Axle: 15mm x 100mm thru axle

Brake standard: IS2000 disc brake

Steerer tube: tapered 1.5“ -> 1 1/8“

Rake: 50 mm

Fork length: ca. 470 mm       

Max. tire dimension 29“ x 2.4“

Light cable routing option

2 eyelets per fork leg

Frameweights incl. powdercoating and small parts

Bad Granny Size M = 2950g +/- 75g

Bad Granny Size L =3080g +/- 75g

Fork Bad Granny: 1275 +/- 50g

All weights in grams g.
All weights with powder coating and averaged with 3 frames per size.

Delivery items

Frame: Frame, Excentric bottom bracket, Derailleur hanger (derailleur/Singlespeed), Axle and Seat clamp

Frameset: Frameparts + Fork, front axle and Acros Headset