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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.


    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.


    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.

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