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Otso Voytek

Otso Voytek
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Voytek changes the fat bike game. It is fast, lightweight, agile, and can handle even the sharpest turns of your local singletrack with ease. Think of it as a mountain bike that can fit fat tires with adjustable geometry. We paired a narrow pedal stance—aka Q factor—with aggressive XC race geometry to build a fat bike that can intuitively handle snowy trails like your mountain bike can handle summer singletrack without sacrificing ride quality. When the weather turns and the snow turns to dirt, swap out the 26" fat wheelset for a 29" MTB wheelset to keep the party going all year.

The Voytek has the narrowest Q-factor of any fat bike in the world at 183mm. With a narrow Q-factor, your weight is closer to the centerline of the bike. This is especially important when cornering because it allows for tight, responsive control—the wider Q-factor found on most fat bikes spreads out your pedals and creates a floppy, unstable feel. The Voytek frame was designed around an 83mm bottom bracket, where most fat bikes have a bottom bracket north of the 100-110mm range. With the Voytek, you don't need to compromise agile handling to ride up to 4.6" tires.

Our Tuning Chip rear dropout is at the heart of the versatile Voytek. With a quick change in positions, the wheelbase of the Voytek can be extended or shortened by up to 20mm, which also changes bottom bracket height by up to 4mm and head tube angle by +/- 0.5º. In the forward position, you've got an aggressive, responsive Voytek for your next race. In the rear position, you've got that same intuitive handling but with added stability to make it easier to ride in deep snow or adverse terrain. In the middle, well, that's the best of both worlds.

We're internally divided here as to whether the Voytek is a plus bike that can handle fat tires or if the Voytek is a fat bike that has the handling worthy of a plus bike. When the trails are packed with snow, we're riding 4" tires. When spring comes and the trails turn to dirt, we swap out tires and ride 29" plus until winter returns. The versatility of the Voytek blurs the lines of plus and fat, keeping the party going all year long.

Voytek's longer top tube, short chainstays—the shortest in the world for a fat bike—and slightly slacker head tube angle mean more speed and more fun.

Voytek's suspension-corrected geometry is compatible with an Otso carbon rigid fork or up to 120 mm travel suspension fork.

Voytek's patent-pending frame design exceeds all ISO frame safety standards and has been proven over thousands of miles of test riding, including the legendary Iditarod Invitational and Arrowhead 135 competitions.

The EPS molded carbon frame of the Voytek was designed to accept internally routed dropper seat posts.

Geo Chart

Geometry Chart:
Recommended Rider Height 4' 9" - 5' 5" 5' 5" - 5' 9" 5' 9" - 6' 1" 6' 1" - 6' 7"
Effective top tube (mm) 585 610 630 645
Nominal head tube angle (rigid and 100 suspension fork) 69° 69° 69° 69°
Nominal head tube angle (120 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 (mm) 90 115 130 150
Nominal seat tube angle 73° 73° 73° 73°
Seat tube length (mm) 381 432 483 533
Bottom bracket drop (mm) 58 - 62 58 - 62 58 - 62 58 - 62
Chainstay length (mm) 430 - 450 430 - 450 430 - 450 430 - 450
Wheelbase (mm) 1092 - 1112 1118 - 1138 1139 - 1159 1156 - 1176
Trail (mm) 85.5 85.5 85.5 85.5
Fork offset (mm) 51 51 51 51
Rigid fork axle to crown length (mm) 485 485 485 485
Stack (mm) 581 602 616 634
Reach (mm) 407 426 442 451
Standover (mm) 697 739 780 815


Frame Voytek™ patented carbon frame, Tuning Chip™ dropout system, 177x12 rear hub spacing, Plus-Fat Narrow Q-factor design with PF107BB, guided internal rear derailleur routing, accommodates internally routed dropper post, external brake routing, downtube and chainstay protectors, matching allow bottle cage bolts
Fork Lithic Carbon Fat Fork, suspension corrected, tapered steerer tube, 485mm axle-to-crown, 51mm offset, with bottle mounts
Wheels SUNringle Mulefut 26" 80mm with SUNringle hubs
Axles Wolf Tooth
Tires Varies by Bike Shop
Bottom Bracket Race Face, PF107, Ø41mm
Crankset Race Face Aeffect 83mm spindle and custom offset Wolf Tooth CAMO system
Chainrings Wolf Tooth 30T
Shifters Shimano SLX M7100 Trigger, 12-speed
Rear Derailleur Shimano SLX M7100, 12-speed
Cassette/Freewheel Shimano SLX M7100, 10-51t, 12-speed
Chain Shimano SLX 12-speed
Brakes Magura MT4
Handlebars Race Face Ride, 740mm riser
Tape/Grips Wolf Tooth silicone grips
Stem Aluminum
Headset Wolf Tooth Performance Headset, IS42/IS52
Seatpost Aluminum, 30.9mm
Saddle WTB Volt Medium, 142mm width
Pedals Sold Separately

* Subject to change without notice.