Crumble – even tastier

Modern XC? Trailbike? The one for anything? The updated crumble just received all the right tweaks here and there to time-warp our favorite trail hardtail right into the present.

Its longer reach paired with the not-too-steep head angle combines downhill capabilities with quick steering reaction as well as low to mid speed fun. Still, there’s nothing too fancy and experimental here, just like your favorite crumble pie.



Handmade Sour Bicycles CrMo frame

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

Dropouts: new dropout design with replaceable derailleur hanger

Seat clamp: new integrated seat clamp

Headtube: 44 mm

Bottom bracket: 73 mm bsa

Axle: 12mm x 148mm boost thru axle

Seat post: 31.6mm seatpost diameter

Brake standard: PM160 disc brake standard

Recommended fork travel: 120 mm – 140 mm

Wheel size: size S fits 650b only, M-XL fit 29“ only

Tire clearance: for up to 2.5“

More facts:

New second water bottle option (except size small)

New 66.5° headangle (with a 531mm fork)

Internal cable routing


FOX 34 Performance Elite 130mm black

2021, 34mm cast, 27.5″ or 29″, 130mm, FIT4, 3 POS-ADJ, 15QR x 110mm, 44/51mm offset 

FOX 34 Factory 130mm black

2021, 34mm cast, 27.5″ or 29″, 130mm, FIT4, 3 POS-ADJ, 15QR x 110mm, 44/51mm offset 

Dropper Posts:

FOX Transfer Performance Elite 31,6mm 150mm black

FOX Transfer Factory 31,6mm 150mm kashima/black


FOX Transfer lever left for 1x drivetrain, 22,2 mm

FOX Transfer lever left/right, 22,2 mm

Frameweights incl. powdercoating and small parts

Crumble S = 2660g +/- 50g

Crumble M = 2710g +/- 50g

Crumble L = 2770g +/- 50g

Crumble XL = 2870g +/- 50g

Fox 34 Performance Elite = 2250 g +/- 50g 29″

Fox 34 Float Factory = 2050 g +/- 50g 29″

Fox 34 Performance Elite = 2215 g +/- 50g 27.5″

Fox 34 Float Factory = 1950 g +/- 50g 27.5″

Fox Performance Elite = 585g +/- 20g

Fox Factory Transfer 150mm = 495g +/- 20g

PNW Loam Dropper Post 150mm = tba

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

Delivery items

Frame: Frame, Derailleur hanger and axle

Frameset: Frameparts + Fork, front axle and Acros headset