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Otso Fenrir Stainless Drop Bar

Otso Fenrir Stainless Drop Bar
  • Color: Stainless Steel
Color: Stainless Steel
Size: Large
Please select options Unavailable


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 and both selections are available as stock build options. 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.

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.

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.

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.

Every last feature of Fenrir is optimized for bikepacking. The stainless steel frame is strong, comfortable, and surprisingly light weight. 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 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, there is a single speed Tuning Chip available ready to order alongside other accessories. There's no wrong way to build your Fenrir.

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. 

Geo Chart

Geometry Chart:
Recommended Rider Height 4' 10" - 5' 4" 5' 3" - 5' 7" 5' 7" - 5' 11" 5' 11" - 6' 3" 6' 3" - 6' 6"
Stack (mm) 595 605 623 642 660
Reach (mm) 387 403 416 428 441
Head Tube Length (mm) 90 100 120 140 160
Head Tube Angle (Rigid or 100mm) 68º +/- 0.2 68º +/- 0.2 68º +/- 0.2 68º +/- 0.2 68º +/- 0.2
BB Drop (mm) 68 - 72 68 - 72 68 - 72 68 - 72 68 - 72
Trail (mm) 88 88 88 88 88
Fork Length, Full (mm) 495 495 495 495 495
Fork Rake/Offset (mm) 51 51 51 51 51
Chainstay Length (mm) 430 - 450 430 - 450 430 - 450 430 - 450 430 - 450
Wheelbase (mm) 1090 - 1110 1110 - 1120 1130 - 1150 1150 - 1170 1170 - 1190
Top Tube Length, Horizontal (mm) 547 565 583 600 618
Bike Standover Height (mm) 754 777 810 838 866
Seat Tube Length (mm) 360 400 450 490 530
Seat Tube Angle 75º +/- 0.2 75º +/- 0.2 75º +/- 0.2 75º +/- 0.2 75º +/- 0.2


Frame Custom butted austenitic stainless steel frame
Fork Carbon Enve Mountain Fork, 15mm thru axle
Wheels SUNringle Duroc 30 Comp 29
Axles Wolf Tooth
Tires Maxxis Aspen 29x2.4
Bottom Bracket Shimano english thread BSA, Ø73mm
Crankset Race Face Aeffect
Chainrings Wolf Tooth 34T
Shifters Shimano GRX 600
Rear Derailleur Shimano GRX 810, 11 speed
Cassette/Freewheel Shimano SLX, 11-46T, 11-speed
Chain Shimano HG-11X
Brakes Shimano GRX 600 Hydraulic
Handlebars Lithic Corundum aluminum compact drop with 16° flare
Tape/Grips Wolf Tooth Supple Lite Bar Tape
Stem Aluminum
Headset Wolf Tooth Performance Headset, ZS44/EC44
Seatpost Aluminum, 31.6mm
Saddle WTB Volt Medium, 142mm width
Pedals Sold Separately
Accessories & Extras Base build spec shown. Custom builds available. Call or visit us for details.

* Subject to change without notice.

Part Numbers

Option MPN Store SKU
Stainless Steel / Large FEN-SST-GRX6-DROP-L 210000015136