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    The versatility of the Voytek frame geometry means that it can perform exceptionally well as a hard tail plus tire mountain bike in the summer and a go anywhere fat bike in the winter. Normally, converting a bike from Plus to Fat form requires a different wheelset and transferring a cassette and brake rotors back and forth. The Plus-Fat build uses in-between 50mm width rims which work well with both 27.5 x 2.8" Plus tires and 27.5 x 3.8" Fat tires. This build includes two sets of tires so switching between Plus and Fat is a simple as swapping out the tires.

    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 Trail 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

    Voytek rigid carbon fork, suspension corrected, tapered, 485mm axle to crown, 51mm offset
    Note: RockShox Bluto 120mm, Lauf Carbonara, Manitou Mastodon Pro 120mm and Manitou Mastodon Comp 120mm upgrades available


    HEADSET Cane Creek 10 Series, IS41/IS52 w/ Wolf Tooth bling kit 
    REAR DER Shimano SLX, 11 speed
    FRONT DER None, 1x only bike
    SHIFTERS Shimano SLX Trigger, 11 speed
    CASSETTE Shimano SLX 11-46t 11 speed
    BRAKES Magura MT4
    CRANKS Race Face Aeffect 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)
    BAR Race Face Ride 740mm riser
    GRIPS Lock-on grips with blue or black ano to match the bike color
    STEM Race Face Ride (60mm stock. 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 50mm Lithic Rhyolite aluminum rims. Tubeless kits available on add-on page

    PLUS: Terrene McFly Lite 27.5 x 2.8"

    FAT: Maxxis Minion 27.5 x 3.8" FBF (front) and FBR (rear)

    SIZE S, M, L, XL
    Weight (Size Medium)* 25.4 lbs with rigid fork set up tubeless

    *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 Race Face Next SL crankset, 188 mm with Race Face 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°