OTSO - FENRIR TITANIUM ADVENTURE FRAME

RIDE ANYWHERE 

Drop bar or flat bar; suspension or rigid; mechanical, electric or single-speed. You decide.

The Otso Fenrir is a ride-anywhere bike for bikepacking races and afternoon adventures alike. It can be built with drop bars or with MTB bars. A tyre 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.

VERSATILITY:

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 built 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.

RUN IT WITH DROP BARS:

The 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.

RUN IT WITH FLAT BARS:

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.

OPTIMISED FOR BIKEPACKING:

Every last feature of Fenrir 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" tyres for trails that are especially gnarly. No matter your destination and how long it takes to get there, Fenrir is ready.

SINGLE SPEED IT IF THAT'S YOUR THING:

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.

SO MANY MOUNTS:

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.

CAPABLE GEOMETRY:

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.

DROPPER FRIENDLY:

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.

Fenrir frames are available as a bare frame (with a Wolf Tooth seatpost clamp and alloy accent kit included), which becomes a frameset with your choice of a Lithic or ENVE carbon rigid fork. Browse our range of headsets, and dive deeper into our range to get inspired for cockpit, wheels and all the extras you need to get that build up and running.

OTSO - FENRIR TITANIUM ADVENTURE FRAME

FRAME SPECIFICATIONS:

Material | 3Al/2.5V B338 grade 9 titanium
Bottom bracket standard | BSA English Threaded, 73mm
Maximum chainring size | 1x: 40T round or 38T oval
Headset | ZS44/28.6 upper, EC44/40.0 lower
Seatpost diameter | 31.6mm
Internal dropper post routing | Yes. Exit port on bottom of seat tube
Seatpost clamp | 34.9mm
Front/rear hub standard | 110x15mm thru axle / 148x12mm thru axle
Front/rear axle | 15x100mm front, TP=1.5, TL=15mm / 12x187mm rear, TP=1.5, TL=12mm
Derailleur hanger | Wolf 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-crown | 490mm (suspension-corrected for 100mm suspension fork)
Fork offset | 44mm or 52mm
Bare frame weight | (L) 1814g (3.9 lbs.)
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 positions
Tire clearance (fork) | Max clearance 29" x 2.8" or 27.5" x 3.0"
Braze-ons |  Three bottle frame mounts, fender, rack, cable clamps, two three-pack mounts on fork
Seatpost Insertion Depth | X-Small 170mm; Small 210mm; Medium 260mm; Large 290mm; X-Large 330mm