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    Fenrir Ti


    Fenrir isn't your typical mountain bike. This one was designed from the trail up for bikepacking. Where most bikes can feel wobbly when loaded with a week's worth of gear, Fenrir rides confident and strong as ever. Build it with drop bars or flat bars, suspension fork or rigid fork, dropper post or rigid seatpost, gears or single speed, and a mechanical or electronic drivetrain. A tire clearance of 29” x 2.6” or 27.5” x 2.8” keeps the Fenrir rolling on rough terrain, while extra frame and fork braze-ons are ready to carry gear for days or weeks on the trail. Like all Otso bikes, the Fenrir has adjustable geometry via the patented Tuning Chip rear dropout system that makes the bike as adaptable as its rider.


    With purchase of select Bikes*

    Use coupon code FREEWHEELS

    *Promotion only valid on Waheela C, Warakin, and Fenrir complete bikes for either one set of SUNringle G30 Expert gravel wheels or SUNringle Duroc 30 Comp 29" boost wheels. Does not include any extra tires, cassettes, or rotors. Valid now thru 6/1/2023 or while supplies last.

    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.

    Fenrir Ti Frameset
    $ 3,550.00

    Fenrir Ti Drop Bar
    $ 5,120.00

    Fenrir Ti Flat Bar
    $ 5,120.00

    Our bikes are available for purchase here on our website and with our growing network of bike shops. If you’d like to work with your local Otso dealer to build a bike, click the Find A Dealer button to find an Otso bike shop near you.


    While all Otso bikes are known for their versatility, the Fenrir might be the most versatile yet. It was designed to accommodate drop bars with a 50mm stem or MTB bars with an 80mm stem. It can be build with gears or single speed, with a suspension fork or rigid, with a mechanical or electronic drivetrain, or with a dropper or rigid seat post. The ability to fully customize the build of the bike makes the Fenrir as versatile as its rider.


    Fenrir was designed with the option to be built with drop bars or MTB bars. When configured with drop bars, the Fenrir rides like an extra-capable gravel bike. The relatively longer top tube means a shorter stem is needed with drop bars to align with the rider's preferred reach. It can be built with standard road/CX/gravel bars for rides on local trails or with wider bars to fit a handlebar roll loaded with lots of gear.


    When built with MTB bars, Fenrir rides like a 90s XC bike. It's fun and lively, yet efficient and Capable with a capital C. It can handle any sketchy descent or technical climb with ease. Because the top tube is relatively short for a mountain bike, a longer stem (80-90mm) is ideal for maintaining reach. Ride it on your local singletrack or load 'er up for that backcountry tour that you've been dreaming about –you know the one. However you choose to build it, Fenrir will ride any road/trail on the map and carry all the gear to get you there.



    A bikepacking bike needs to be able to carry all the gear for days or weeks on the trail. Fenrir has mounts for bottles, fenders, and racks. The Enve fork also has three-pack mounts on either side for sharing the load.


    Pick a trail on the map and ride it. Fenrir has the endurance of a gravel bike, with the stability of a mountain bike. Above all, it is Capable with a capital C so you can stay the course and reach your destination.


    A small port near the bottom of the seat tube allows for the cable routing of a dropper post. If you don't ride with a dropper, you probably won't even notice the port.


    Tires need to meet demands of the trail for traction, stability, and comfort. Fenrir can ride up to 29" x 2.6" or 27.5" x 2.8" tires.  


    Every last feature of Fenrir Ti is optimized for bikepacking. The titanium frame is strong, smooth, and lighter than steel. It can be built with flat bars or drop bars depending on your affinity for large handlebar rolls. Single speed is an option for folks who like simplicity while touring. It has extra mounts on the frame and fork for hauling all the gear you'll need for days (or weeks) on the trail. The frame and fork can clear 29" x 2.6" or 27.5" x 2.8" tires for trails that are especially gnarly. No matter your destination and how long it takes to get there, Fenrir Ti is ready.


    All metal Otso bikes have the option to be built single speed or with gears. Fenrir is included in that group because it has a small notch on the rear dropout near the Tuning Chip. If you build your Fenrir with gears, but want to convert to single speed later on, we have the single speed Tuning Chip available on our website alongside other accessories. There's no wrong way to build your Fenrir.



    Frame3Al/2.5V B338 grade 9 titanium3Al/2.5V B338 grade 9 titanium
    ForkCarbon Enve Mountain Fork, 15mm thru axleCarbon Enve Mountain Fork, 15mm thru axle
    HeadsetWolf Tooth Performance HeadsetWolf Tooth Performance Headset
    Rear derailleurShimano GRX 810, 11-speedTRP G-Spec TR12, 12-speed
    Front derailleurN/AN/A
    ShiftersShimano GRX 600, 11-speedTRP G-Spec TR12, 12-speed
    CassetteShimano SLX, 11-46T, 11-speedSRAM GX, 10-51T, 12-speed
    BrakesShimano GRX 600 hydraulicMagura MT4 hydraulic
    CranksRace Face AeffectRace Face Aeffect
    HandlebarLithic Corundum aluminum compact drop with 16° flareLithic flat bar
    Tape / GripsWolf Tooth Supple Lite Bar TapeWolf Tooth silicone foam grips
    WheelsSun Ringle Duroc 30Sun Ringle Duroc 30
    TiresMaxxis Aspen 29" x 2.4"Maxxis Aspen 29" x 2.4"
    Frame SizesXS, S, M, L, XLXS, S, M, L, XL
    Bottom bracket standardShimano english thread BSA, Ø73mm
    Maximum chainring size1x: 40T round or 38T oval
    Front derailleur typeN/A
    HeadsetZS44/28.6 upper, EC44/40.0 lower
    Seatpost diameterØ31.6mm
    Internal dropper post routingYes. Exit port on bottom of seat tube
    Seatpost clampØ34.9mm
    Front/rear hub standard110x15mm thru axle / 148x12mm thru axle
    Front/rear axleØ15x110mm front, TP=1.5, TL=15mm / Ø12x187mm rear, TP=1.5, TL=12mm
    Derailleur hangerWolf Tooth Tuning Chip Right Dropout
    Rear brake (rotor)Flat mount, 74mm post mount available(160mm)
    Front brake (rotor)Post mount native,(160mm post mount or 180mm flat mount)
    Fork axle-to-crown490mm (suspension corrected for 100mm suspension fork)
    Fork offset44mm or 52mm
    Bare frame weight (L)3.9lbs (1814g)
    Fork weight (Enve rigid fork)676g
    Tire clearance (frame)2.3" at 420mm chainstay position, 2.8" (for 27.5" wheels) or 2.6" (for 29" wheels) at 430/440mm chainstay position
    Tire clearance (fork)Max clearance 29" x 3.0"
    Braze-ons3 bottle mounts, fender, rack, cable clamps
    Frame Bag Dimensions X-Small Small Medium Large X-Large
    Recommended rider height4'10"-5'4"5'3"-5'7"5'7"-5'11"5'11"-6'3"6'3"-6'6"
    Effective top tube547mm565mm583mm600mm618mm
    Nominal head tube angle68°68°68°68°68°
    Tuning Chip induced head/seat tube angle change±0.2°±0.2°±0.2°±0.2°±0.2°
    Head tube length90mm100mm120mm140mm160mm
    Nominal seat tube angle75°75°75°75°75°
    Seat tube length360mm400mm450mm490mm530mm
    Bottom bracket drop68-72mm68-72mm68-72mm68-72mm68-72mm
    Chainstay length430-450mm430-450mm430-450mm430-450mm430-450mm
    Fork offset51mm51mm51mm51mm51mm
    Rigid fork axle to crown length495mm495mm495mm495mm495mm

    Compatible fenders

    PDW - Sodapop


    compatible racks

    Axiom - Streamliner 29er DLX Rear Rack (requires Tuning Chip with threaded rack mounts)

    Topeak - Uni Super Tourist DX Rear Rack (requires Tuning Chip with threaded rack mounts)

    Blackburn - Outpost Rear World Touring Rack (requires Tuning Chip with threaded rack mounts)

    Old Man Mountain - Divide Front Rack axle mounted with Fit Kit SET701

    Old Man Mountain - Divide Rear Rack axle mounted with custom Fit Kit SET822


    Frame Bag Dimensions

    (click on links to view PDF drawings)