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Planet X Bikes

On-One Mulo Frame

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Built with aerospace grade custom drawn chromoly DN6 steel, the On-One Mulo is a single speed...

Built with aerospace grade custom drawn chromoly DN6 steel, the On-One Mulo is a single speed and commuter ready frame. With optimal strength and fatigue endurance its timeless looks are built for a lifetime.

  • Agile All-Road / Urban Geometry
  • DN6 Chromoly Custom Drawn Steel
  • 10mm CNC Slot Dropouts for Single Speed
  • Tyre Clearance 700c x 43mm
  • Cantilever Calliper Rim Brakes

Triple Butted DN6 custom drawn steel results in a frame that is strong, responsive, and comfortable whilst shaving off excess weight. Tube wall thickness is strictly controlled to offer strength at welds and lightness. Custom seat stay wishbone reduces harsh feedback and further increasing tyre clearance.

A 28.6mm diameter toptube and 38.1 diameter downtube offer sprightliness and strength alongside a 27.2mm seat post for comfort. 29.8mm seat clamp is required. A custom profile head tube allows for a large weld platform and bigger bearings. Resulting in a stronger, less flexible, and better handling front end without excess stiffness. The head tube accepts standard 1 & 1/8th to 1.5 tapered steerer tubes. Or a straight 1 & 1/8th steerer with the addition of a lower bearing reducer. The frame has been designed around a 395mm axle to crown fork.

The 71/72 degree head angle offers a trail figure that corners smoothly and predictability. An endurance shorter reach figure offers comfort, whilst the 66mm BB drop and 410mm chainstays give agility.

Featuring 2 sets of bottle cage bosses, full mudguard, and pannier bosses. Ready for all weather adventures. Pannier mounts and full mudguard capability make it perfectly suited to commuters and all-road tourers. The BSA 68mm threaded bottom bracket is ultra-durable, creak free and easily serviceable. The 10mm horizontal dropouts are CNC machined and feature 120mm track hub spacing. Suited for Single Speed, Fixed Gear and Track set up.

The frame is set up for cantilever calliper rim brakes. Simple, economical, effective. Suited for Selcof SPORT Integrated Headset For Tapered 1" 1/8th 1.5" Fork Steerer or FSA Orbit C-40-ACB no.42 style Max chainring size 48T Frame Weight: Med 2.15kg

From £99.00  £99.99

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Frame Material

DN6 Custom Triple Butted Chromoly Steel 

Frame Weight, Approx, (med)


Wheel Axles

10 x 120mm Track Axle

Seat Post Size


Seat Clamp Size


Front Mech Type

Single Speed

Front Mech Clamp Size

Single Speed

Wheel Size


Mudguard mounts


Rack Mounts


Bottle Cage Bosses


Brake Type

Cantilever Rim Brake

Bottom Bracket

BSA Threaded 68mm

Dropper Compatible


Headset Type

Internal Tapered

Headset Model

FSA Orbit C-40 No 42 ACB

Fork Length

395mm A/C

Tyre Clearance


Cable Routing

External Brake

Di2 Compatible



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