Based around a twin top tube frame design, giving optimal material placement and futureproofed mounting points for a high volume frame bag, On-One's new fat bike features progressive trail worthy geometry optimised for use in true "all terrain" conditions.
We designed the huge On-One Floater 4.0in tyre on 70mm rims to give superb floatation and tracking over a huge range of surfaces, allowing traction where any other tyre would be left bogged down and spinning. Run a 6-15psi they offer an incredible amount of shock absorption, tuneable with the psi used, to give optimal conditions. If in doubt, let air out! The wheels run on our own model Fat hubs, CNC'd from solid 6061 billet aluminium with a 135mm axle spacing up front, and a 170mm rear. Putting the chainline perfectly positioned for tyre clearance on the 100mm wide BB shell. It's all designed to give a great ride without you having to worry about fixing parts up yourself.
Our 5pc welded fork allows us to control ride quality of the rigid fork, and also equip Fatty with the best handling we've found around. A long 55mm fork offset dials the 68deg head angle perfectly in to trail riding up and down, with a light touch when you need it and stability when things get bouncy. Futureproofed with a 470mm fork length, we're ready for the fat front suspension revolution too.
Build on this model is from SRAM with their X5 10spd group giving 1x10 efficiency and a good low climber gear. The Holzfeller crankset shrugs of everything you can throw at it, spinning on a BB that's SRAM rated for toughness.
Other finishing kit comes from our proven supplies, new and old. Seatpost size is 31.6mm, an On-One Hotbox stem clamps an El Guapo Ancho B bar, with On-One Bob on grips. Headtube size is Smoothie Mixer standard, so will work with our Slacksets to adjust steering feel further.
Why get Fat? Why not?! It's a totally new experience, trail capable and fun fun fun. As recently as last week, our chief tester Jon "Shaggy" Ross, rode the whole of the gruelling Trans Provence race route on his proto Fatty, solidly putting this genre on the map for trail capable handling. Four inches of bouncy rubber might be a world away from 150mm full suspension bikes, but it's like compared cheese and chocolate. Fat is good. Get Fat. Get Fatty.
Complete bike weight 34lb
|Frame:||On-One Fatty Frame|
|Fork:||On-One Fatty Fork|
|Front Derailleur:||SRAM X5 Front Mech / 2x10 / Max 38T / High Direct Mount / Dual Pull|
|Rear Derailleur:||Sram X5 Rear Mech / 10 Speed / Black / Medium|
|Shifters:||Sram X5 Trigger Shifter 10 Speed|
|Chainset:||SRAM X5 Chainset|
|Crank length:||175 mm|
|Bottom Bracket:||Truvativ Howitzer 100mm shell Bottom Bracket, Chainline: 66 mm|
|Cassette:||SRAM PG 1030 Cassette / 10 Speed / 11-36T|
|Chain:||SRAM PC1031 10 Speed 114 Link Chain|
|Front Brake:||Avid DB3 Hydraulic Disk Brake / Front / 900mm / 20 Post To IS / Black|
|Brake Rotor Front||Avid Clean Sweep G2CS, Size: 180 mm,|
|Rear Brake:||Avid DB3 Hydraulic Disk Brake / Rear / 1400mm / 20 Post To IS / Black|
|Brake Rotor Rear||Avid Clean Sweep G2CS, Size: 160 mm|
|Handlebars:||El Guapo Ancho Handlebars, Width: 810mm, Black or White|
|Grips:||On-One Half Bob Lock-On Grips / Black|
|Stem:||On-One Hot Box Stem 70,80,90,100 mm|
|Headset:||On-One Smoothie Mixer Tapered Headset 1 1/8 inch - 1.5 inch / Black / Mix Tapered|
|Wheels:||On-One Fatty Wheelset|
|Front Tyre:||On-One Floater Fat Tyre 4.0 inch, 120 TPI, Folding, Black|
|Rear Tyre:||On-One Floater Fat Tyre 4.0 inch, 120 TPI, Folding, Black|
|Inner Tube:||On-One 26" Fatty Fatbike TubeWidth: 2.5-2.7" Heavy Duty|
|Saddle:||On-One Bignose Evo Saddle / CroMo Rail|
|Seatpost:||On-One Twelfty MTB Seatpost - 31.6mm|
|Pannier rack compatible:||No|
|Bottle cage bosses:||1 set|
|Number of Gears:||20|
|Weight:||34lb - 15.4 kg|
|A||Head Angle (°)||68||68||68|
|B||Head Tube Length (mm)||100||120||140|
|C||Effective Top Tube (mm)||570||595||610|
|D||Seat Angle (°)||73||73||73|
Seat Tube Length Centre to Top (inch)
|F||Chainstay Length (mm)||445||445||445|
|G||Standover Height (mm)||740||740||740|
|Rider Height||Inside Leg||Suggested Frame Size||Stem Length|
|5′6″ to 5′10″||28”-31”||16”||40-60mm|
|5′9″ to 6′1″||30”-34”||18”||40-60mm|
|6′10" to 6′3″||33”-36”||20”||40-60mm|
All frame size recommendations are approximate. A good fit will also depend on the correct choice of stem length, correct bike set-up for the rider and riding style.
Correct frame size choice can also depend on a rider’s torso and limb length.