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    Otso Cycles Voytek

    A fat bike for all seasons

    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 bikes are available to purchase here on our website or with our network of Otso dealers. Our Custom Bike Configurator allows you to select most component options on your bike, including drivetrain, wheelset, tires, handlebars, seatpost, anodized accent color option, and more. Voytek is also available as a frameset if you already have parts ready to go at home. We’re happy to talk through options to help you build the Voytek that is perfect for you and your riding style.

    Voytek Custom Bike Configurator
    $ 3,990.00

    Voytek Frankset
    $ 2,790.00

    The Radavist Voytek Bike Configurator
    $ 4,190.00

    The Radavist Voytek Frankset
    $ 2,930.00

    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.

    Otso has a small (but growing!) network of bike shops that sell our bikes. Click the button to the right to see a map of all Otso dealers. If there is not one in your area, you can still build and order any of our bikes right here on our website. Give us a shout at with any questions.  


    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.

    "The Voytek is not your average fat-tire machine; it’s a bike designed to be built for many different intended uses. The Voytek can be trans-formed into a plus-sized hardtail with a suspension fork and a dropper post, or it can be ridden as a fat bike with the narrowest Q-factor on the market."

    Mountain Bike Action Magazine

    "My first impressions of the Voytek are very, very positive. Not only have they designed in some features that should offer big advantages for some riders (like the narrow Q-factor) but they have also developed a very well thought out design with high quality construction."

    "Wide Q factor is something that fat bikers have had to live with as tires started to get wider and wider, but now that I’ve had the taste of something narrower that still fits relatively wide tires, I’m not sure I can go back."

    Bike Rumor

    "If a 4-season rider asked me what single bike to buy for year round enjoyment, the Voytek would be top of my list."

    Gear Institute


    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.

    "I feel pretty safe in saying that yes, this joyful warrior is for you. Mountain biking? It’s a riot. Bikepacking? You’re good to go. Casual fat biking? It’ll be the easiest bike to toss in your buddy’s truck. Fat bike racing? Considering how incredibly stiff — not to mention light — the frame is, racing might be this bike’s calling."

    Adventure Cycling

    "Otso blurs the line between plus-size and fat. It’s a carbon-fiber hardtail built for riders who need high performance and good value, transforming between two setups: mountain bike and fat bike. It does so with no compromise and has the narrowest Q-factor of any production fat bike."


    "It’s the bike I’ve been wanting for years because, at last, your year-round rig can double as a winter fattie without compromise in either format."

    Outside Magazine

    "It’s smartly designed and its details well thought-out, it’s reasonably priced, looks good, rides and handles well, and should last for ages. What’s not to like?"



    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.


    The Voytek can run a wide range of wheel sizes: 27.5" or 29" plus MTB tires to 26" x 4.6" fat tires.



    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.


    FrameVoytek™ 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
    ForkVoytek™ rigid carbon fork, suspension corrected, tapered steerer tube, 485mm axle-to-crown, 51mm offset
    HeadsetWolf Tooth Precision Headset, IS42/IS52
    Rear derailleurShimano SLX M7100, 12-speed
    Front derailleurNone, 1x only bike
    ShiftersShimano SLX M7100 Trigger, 12-speed
    CassetteShimano SLX M7100, 10-51t, 12-speed
    BrakesMagura MT4
    CranksRace 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 bracketRace Face, PF107, Ø41mm
    HandlebarRace Face Ride, 740mm riser
    GripsWolf Tooth silicone grips
    StemRace Face Ride (60mm standard. Other lengths available by request)
    SeatpostRace Face Ride, 30.9mm
    SeatWTB Volt
    WheelsLithic sealed cartridge bearing 6-bolt rotor hubs with tubeless ready 70mm Lithic Rhyolite aluminum rims. Tubeless kit upgrade available.
    TiresSchwalbe Jumbo Jim 26 x 4.0 LiteSkin
    ChainShimano SLX 12-speed
    Frame SizesS, M, L, XL
    Weight (size M)25.4 lbs with rigid fork set up tubeless
    Frame SizeSmallMediumLargeX-Large
    Recommended rider height4'9"-5'5"5'5"-5'9"5'9"-6'1"6'1"-6'7"
    Recommended rider inseam29"-32"31"-33"32"-35"34"-37"
    Effective top tube585mm610mm630mm645mm
    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 length90mm115mm130mm150mm
    Nominal seat tube angle73°73°73°73°
    Seat tube length381mm432mm483mm533mm
    Bottom bracket drop58-62mm58-62mm58-62mm58-62mm
    Chainstay length430-450mm430-450mm430-450mm430-450mm
    Fork offset51mm51mm51mm51mm
    Rigid fork axle to crown length485mm485mm485mm485mm

    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)