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.
Otso Cycles Voytek
A fat bike for all seasons
THE Q-FACTOR IS THE KEY
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.
ONE BIKE,
THREE WHEELBASE LENGTHS
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.
PLUS OR FAT? FAT OR PLUS?
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.
WHEELIES GALORE!
The Voytek can run a wide range of wheel sizes: 27.5" or 29" plus MTB tires to 26" x 4.6" fat tires.
AND SO MUCH MORE ...
MODERN GEOMETRY
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.
SUSPENSION CORRECT
Voytek's suspension-corrected geometry is compatible with an Otso™ carbon rigid fork or up to 120 mm travel suspension fork.
COMPETITOR TESTED, ISO APPROVED
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.
DROPPER COMPATIBLE
The EPS molded carbon frame of the Voytek was designed to accept internally routed dropper seat posts.
TECHNICAL DETAILS
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Base Build
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Frame Specs
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Geometry
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Tires & Rims
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Fenders & Racks
| 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 | Voytek™ rigid carbon fork, suspension corrected, tapered steerer tube, 485mm axle-to-crown, 51mm offset |
| Headset | Wolf Tooth Precision Headset, IS42/IS52 |
| Rear derailleur | Shimano SLX M7100, 12-speed |
| Front derailleur | None, 1x only bike |
| Shifters | Shimano SLX M7100 Trigger, 12-speed |
| Cassette | Shimano SLX M7100, 10-51t, 12-speed |
| Brakes | Magura MT4 |
| Cranks | Race Face Aeffect 83mm with 175mm crankarms and custom offset Wolf Tooth CAMO system, 32T chainring (size Small frame ships with 170mm crankarms, 170mm crankarms are available on other sizes by request) |
| Bottom bracket | Race Face, PF107, Ø41mm |
| Handlebar | Race Face Ride, 740mm riser |
| Grips | Wolf Tooth silicone grips |
| Stem | Race Face Ride (60mm standard. Other lengths available by request) |
| Seatpost | Race Face Ride, 30.9mm |
| Seat | WTB Volt |
| Wheels | Lithic sealed cartridge bearing 6-bolt rotor hubs with tubeless ready 70mm Lithic Rhyolite aluminum rims. Tubeless kit upgrade available. |
| Tires | Schwalbe Jumbo Jim 26 x 4.0 LiteSkin |
| Chain | Shimano SLX 12-speed |
| Frame Sizes | S, M, L, XL |
| Weight (size M) | 25.4 lbs with rigid fork set up tubeless |
| Bottom bracket standard | 83mm (Press Fit 107) |
| Q-factor | 183mm with Race Face Next SL crankset, 188mm with Race Face Aeffect crankset |
| Maximum chainring size | 36T round or 34T oval |
| Front derailleur type | None. 1x only bike. |
| Headset | IS42 upper, IS52 lower |
| Seatpost diameter | Ø30.9mm, accommodates internally routed dropper post |
| Seatpost clamp | Ø34.9mm |
| Front/rear hub standard | 150x15mm thru axle / 177x12mm thru axle |
| Front/rear axle | Ø15x150mm, TP=1.5, TL=12mm / Ø12x216mm, TP=1.5, TL=14mm |
| Derailleur hanger | Tuning Chip Right Dropout |
| Rear brake (rotor) | 74mm post (160mm native, 180mm max) |
| Front brake (rotor) | 74mm post (160mm native, 180mm max) |
| Fork axle-to-crown | 485mm, suspension corrected to 100-120mm travel forks |
| Fork offset | 51mm |
| Bare frame weight (size M) | 1350g |
| Fork weight (Otso rigid fork) | 650g |
| Tire clearance (frame) | Up to 26" x 4.0" in forward Tuning Chip position, up to 26" x 4.6" in middle and back position |
| Tire clearance (fork) | Up to 26 x 5.4" on 100mm rim |
| 120mm fork note | Using a 120mm suspension fork with slacken the head tube angle by 0.5˚ |
| Frame Bag Dimensions | Small Medium Large X-Large |
| Frame Size | Small | Medium | Large | X-Large |
| Recommended rider height | 4'9"-5'5" | 5'5"-5'9" | 5'9"-6'1" | 6'1"-6'7" |
| Recommended rider inseam | 29"-32" | 31"-33" | 32"-35" | 34"-37" |
| Effective top tube | 585mm | 610mm | 630mm | 645mm |
| Nominal head tube angle (rigid 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 | 90mm | 115mm | 130mm | 150mm |
| Nominal seat tube angle | 73° | 73° | 73° | 73° |
| Seat tube length | 381mm | 432mm | 483mm | 533mm |
| Bottom bracket drop | 58-62mm | 58-62mm | 58-62mm | 58-62mm |
| Chainstay length | 430-450mm | 430-450mm | 430-450mm | 430-450mm |
| Wheelbase | 1092-1112mm | 1118-1138mm | 1139-1159mm | 1156-1176mm |
| Trail | 85.5mm | 85.5mm | 85.5mm | 85.5mm |
| Fork offset | 51mm | 51mm | 51mm | 51mm |
| Rigid fork axle to crown length | 485mm | 485mm | 485mm | 485mm |
| Stack | 581mm | 602mm | 616mm | 634mm |
| Reach | 407mm | 426mm | 442mm | 451mm |
| Standover | 697mm | 739mm | 780mm | 815mm |
Compatible fenders
PDW - Mud Shovel
compatible racks
Axiom - Fatliner Fat Bike Rear Rack (requires Tuning Chip with threaded rack mounts)
Topeak - Uni Super Tourist Fat Rear Rack (requires Tuning Chip with threaded rack mounts)
Blackburn - Outpost Fat Rear Rack (requires Tuning Chip with threaded rack mounts)
Old Man Mountain - Divide Front Rack axle mounted with Fit Kit SET715
Old Man Mountain - Divide Rear Rack axle mounted with custom Fit Kit SET808 with 12mm flat spacer
Frame Bag Dimensions
(click on links to view PDF drawings)
Note: Images may not show actual build kit content. Pricing and specifications subject to change without notice. Comparable components may be substituted when necessary to fulfill bike shipments.
