New Fat bike with two chainrings up front and twice the amount of gears. The Fatty Fat Bike features some of the most progressive 'fat' geometry out there. Since hitting the scene over a year ago we've evolved it further to meet the changing demands and advancements of the fat bike world. This new build has a 2x10 SRAM X5 set-up, increasing things two-fold. More gears, more fat, more fun.
For all terrain riding, whatever the conditions, whatever the weather, there can be but one option. Based around the huge 4" tyres and 70mm rims, the Fatty grips to surfaces that just aren't made for confident two wheeled riding. 6061 CNC'd aluminium hubs with a 135mm axle at the front, 170mm rear keep the Fatty rolling over anything you encounter. At 6-15 psi they soak up shocks like a suspension fork, and allow you to tune your ride through your tyre pressure.
We've kept the SRAM X5 groupset on it but doubled it up; two up front, ten at back. What this means is you have twice as many gears, and a lower climbing gear to tackle even more ground than before. You could say it's twice as good because of this, and you would be correct.
Why get Fat? Why not?! It's a totally new experience, trail capable and fun fun fun. Our chief 'fatty' 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 was good, now get fatter.
|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 Bob On Lock-On Grips|
|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|
|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.
Really enjoyed the bike the two times I've had chance to ride it.
Love it. Using it for everything; riding around town, commuting, crashing through the forest. Imminently to be used on the school run too, now that I've fitted a child seat.Tyres pumped to 15psi really iron out the bumps everywhere. Frame is solid and instills confidence - been ridden down some flights of stairs without any issues (probably shouldn't try that at home).It always starts conversations too, everyone wants to know more about it.The only problem I had with it was not being able to fit a rear child seat. Now I've found one that fits, it's faultless.In answer to the other review, I take it on the car with a Thule 591 carrier. The normal wheel holders need to be removed though - then just bungee cords to hold the wheels to the carrier.
Massive grin everything I go near her!
This bike is one in a million having so much fun riding on the beach and sand dunes, not tried it on single track but will give it a go, had some strange looks whilst riding to work on occasions people don't know what to make of It!!! as much as I like this bike It's not for everyone do you really need a mammoth of a bike that is On-One Fatty, only you can answer that, as for me I'm always smiling when I ride it. The one only negative about this bike would be the fact you cannot mount It on a normal bike rack, have spoken with Planet X and nobody has ever asked the question, so It will travel in the back of the van not the best way but needs must.