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Otso Voytek side view stealth black
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Voytek Ultimate

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stealth black

We set out to make a no compromises “Ultimate” dream bike and this is the result.  Coming in at a stock weight near 21 lbs with durable ready to ride components, this bike yearns to rip the dirt, snow, or whatever you can throw at it. 


Voytek® – The ultimate hardtail mountain bike for plus and fat tires



Two shipping options are available during the checkout process:

  1. Free shipping. This is a frameset and all parts needed to assemble a complete bike. Significant time and mechanical skill is needed to build the bike.
  2. $120 shipping. This is a bike that has been fully assembled and tuned by Otso technicians. The bike will be partially disassembled for shipping (wheels, handlebar and seat post removed) but can be fully assembled by a home mechanic in 30 minutes or less. 

Build Specs


Voytek Ultimate Fat Bike
FRAME Voytek patent pending carbon frame, Tuning Chip dropout system, 177x12 rear axle spacing, Plus/Fat Narrow Q-factor design with PF107 BB, guided internal rear derailleur routing, external brake routing, downtube and chainstay protectors, matching alloy bottle cage bolts
FORK Voytek carbon fork, suspension corrected, tapered, 485 axle to crown, 51mm offset
Note: RockShox Bluto or Lauf Carbonara upgrade available
HEADSET Cane Creek 40 Series, IS41/IS52 with Wolf Tooth bling kit 
FRONT DER None, 1x only bike
SHIFTERS SRAM XX1 EAGLE Trigger, 12 speed
CASSETTE SRAM XG1295, 10-50t, 12 speed
CRANKS Race Face NEXT SL 83mm with 175mm crankarms and custom offset Wolf Tooth CAMO system, 32T chainring (size small frames ship with 170 mm crankarms, 170 mm crankarms are available on other sizes upon request)
BOTTOM BRACKET Race Face (PF107, 41mm OD)
HANDLEBAR Race Face NEXT carbon riser, 725mm width, 15mm rise
GRIPS Red Monkey Karv XT or Wolf Tooth Fat Paws
STEM Race Face Turbine (60mm stock. Other lengths available by request)
SEATPOST Race Face NEXT, carbon 30.9mm
SEAT WTB Volt Team 142, CroMO rails
HUBS Industry Nine Big Rig, 6 bolt with alloy spokes, choice of color
RIMS HED No Big Deal, 65mm wide, carbon fiber
TIRES Schwalbe Jumbo Jim 26 x 4.0 LiteSkin or Terrene studdable
Weight (Size Medium)* 21.4 lbs with rigid fork with Tubeless Jumbo Jims

*Weights are based off pre-production painted frames and may vary slightly in final production.



Voytek® Upgrades and Add-Ons

We worked very hard to create a build spec to maximize the performance of the bike and provide good value but we also understand the importance of customizing your bike for your specific trails and riding style.  For that reason we have partnered with some of the top companies in the industry to provide some fantastic customization options.  Contact us at for customization options.


 Frame Geometry 





Nominal size Small Medium Large X-Large
Recommended rider height* 4'9"-5'5" 5'4"-5'9" 5'8"-6'1" 6'0"-6'7"
Recommended Rider Inseam* 29"-32" 31"-33" 32"-35" 34"-37"
Effective top tube 585 mm 610 mm 630 mm 645 mm
Nominal head tube angle rigid fork and 100mm suspension fork 69° 69° 69° 69°
Nominal head tube angle 120mm suspension fork 68.5° 68.5° 68.5° 68.5°
Tuning Chip induced head/seat tube angle change ±0.2° ±0.2° ±0.2° ±0.2°
Head tube length 90 mm 115 mm 130 mm 150 mm
Nominal seat tube angle 73° 73° 73° 73°
Seat tube length 381 mm 432 mm 483 mm 533 mm
BB drop 58-62 mm 58-62 mm 58-62 mm 58-62 mm
Chainstay length 430-450 mm 430-450 mm 430-450 mm 430-450 mm
Wheelbase 1092-1112 mm 1118-1138 mm 1139-1159 mm 1156-1176 mm
Trail 85.5 mm 85.5 mm 85.5 mm 85.5 mm
Fork offset 51 mm 51 mm 51 mm 51 mm
Rigid fork axle to crown length 485 mm 485 mm 485 mm 485 mm
Stack 581 mm 602 mm 616 mm 634 mm
Reach 407 mm 426 mm 442 mm 451 mm
Standover 697 mm 739 mm 780 mm 815 mm

 (Also available in PDF format for metric and english versions.)

Recommended rider height and inseam are provided as a guideline for general fitting. Details on our free online personal fit can be found here.



Frame Specs

Bottom bracket standard 83 mm (press fit 107)
Q factor 183 mm with Raceface Next SL cranket, 188 mm with Raceface Aeffect crankset
Max chainring size 36T round or 34T elliptical
Front/Rear hub standard 150 x 15 mm thru axle / 177x12 mm thru axle
Seat post diameter 30.9 mm, accommodates internally routed dropper post
Headset IS41 / IS52
Fork axle-to-crown 485 mm (suspension corrected for 100-120 mm travel forks)
Fork offset 51 mm
Tire clearance (frame) 4.0" @ 430 chainstay, 4.6" @ 440/450 chainstay (actual frame clearance of 117 mm)
Tire clearance (Otso fork) up to 4.8" on 100 mm rim
Bare frame weight (size M) 1350 g
Fork weight 650 g
120mm fork note: Using a 120 mm suspension fork will slacken the head tube angle approx. 0.5°



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