Big Bad Jumbo – Frame

745,00  incl. VAT



The Big Bad Jumbo has landed!
As Jimmi, the Founder of Omnium, has progressed more and more in to the world of Mountain Bikes, we thought it about time to make a small batch for our selves. This once-in-a-decade frame is not to be messed with! We give to you 5 different sizes of monster 29+ hardtail mountain bikes (27.5+ for S & XS), coated with a special crackle coating that will make your neighbour look twice.


NB! Frames only come with dropout inserts and thru axle – there is no headset, seatpost clamp, or fork.


The Omnium BBJ is designed as a hardtail that’s nimble enough for mellow single track, but capable of the steep stuff too! At home on a 120-140mm suspension fork, room for juicy 3″ rubbers and headtube gussets, this thing is ready to party!

The frame runs the same adjustable rocker dropouts, as are seen on our line of V3 bikes (CXC, Cargo, Mini-Max, and Mini). However, these are made with boost spacing, 148×12, and the frame comes with 12mm thru axle and gear hanger for external derailleur. Both brake and gear cables run externally, while there is internal routing for your dropperpost. The seattube measures 31.6mm internally and 34.9 for the collar.

Now we know that you like cages, so put loads of mounts both on top and underneath the downtube, as well as made space for one on the seattube.

As mentioned the frames come in 5 different sizes – Medium, Large, and Extra Large are made for 29″+ while sizes Small and Extra Small are 27,5 +. All frames have clearance for 3″ tires, in some cases dependant on rim and tire combo, as well as dropout position.

Finally the headtube is straight 44mm made for semi integrated cup/bearing in the top, and external at the bottom, for tapered fork (1 – 1/8 to 1 – 1/2).


The geometry is based on a 3.0″ tire and 120mm suspension fork (at 25% sag with the rider on the bike). For every 10mm of fork travel you add, the head and seat angles will slacken by approximately 0.5 degrees, while the bottom bracket drop reduces by about 4mm.
Stack 600 mm 601.5 mm 606,5 mm 620 mm 624.5 mm
Reach 395 mm 431 mm 455 mm 496.5 mm 520.5 mm
Eff. Top Tube 540 mm 575 mm 600 mm 645 mm 670 mm
BB Height 315 mm 315 mm 328,5 mm 328,5 mm 328.5 mm
BB Drop 53 mm 53 mm 58 mm 58 mm 58 mm
Head Tube Angle 67° 67° 67° 67° 67°
Eff. Seat Tube Angle 76.5° 76.5° 76.5° 76.5° 76.5°
Chainstay Lenght 415 mm 415 mm 430 mm 430 mm 430 mm
Seat Tube Lenght 360 mm 400 mm 440 mm 480 mm 480 mm
Standover Height 776 mm 796,5 mm 832 mm 859 mm 860 mm
Front Center 686,22 mm 721,1 mm 745,2 mm 792.6 mm 818.4 mm
Axle to Crown 506 mm 506 mm 506 mm 506 mm 506 mm
Fork Offset 51 mm 51 mm 51 mm 51 mm 51 mm
WheelBase 1095,7 mm 1130.7 mm. 1169 mm 1216.6 mm 1242.4 mm

Frame Specifications

Frame materialDouble-Butted Chromoly Steel Frame
FRAME INCLUDESFrame, Dropout Inserts, and Rear Thru Axle

Does NOT include Fork or Headset
GEARSFor 1x rear derailleur gear system
REAR HUB12 x 148mm Boost spacing, IS 160 brake mount
Rear Wheel622, 12 x 148mm spacing, disc only
Front WheelN/A – As no fork is inlcuded
Tyre clearance, frontN/A – As no fork is inlcuded
HEADSET44mm made for semi integrated cup/bearing in the top, and external at the bottom, for tapered fork (1 – 1/8 to 1 – 1/2)
Recommended maximum loading weight including rider125 kg