The Otso Fenrir Stainless 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. The ability to build the Fenrir with different handlebar styles allows the rider to customize the bike to their riding style. When built with drop bars, the Fenrir rides like a gravel bike with extra helpings of capability and confidence. With MTB bars, the Fenrir is lively, fast, and rides like a capable 90s XC bike. Both configurations are meant to ride any road or trail on the map and carry all the gear necessary to get there.

The Fenrir frame is made with custom-butted austenitic stainless steel for a smooth ride and corrosion resistance. It is available in five sizes, from XS to XL. Build it with gears or single speed, with either mechanical or electronic geared drivetrains. The Fenrir has a head tube angle of 68º, a seat tube angle of 75º, boost spacing, and 88mm of trail. It comes stock with a carbon ENVE Mountain Fork that has three-pack mounts on either side and a reversible dropout chip for adjustable rake. The Fenrir can accept a suspension fork with up to 100mm of travel, has routing for a cable-actuated dropper post, and has rack and fender mounts. All build options, from handlebar type, to wheel size, to tires, to drivetrain, to anodized color accents and more can be selected on the custom bike builder.

Present on all Otso bikes is the Tuning Chip rear dropout system, which allows the rider to adjust the bike’s geometry. This is essentially a dropout with three fixed positions. The Tuning Chip can change the wheelbase by up to 20mm, the bottom bracket height by up to 4mm, and the head tube angle by 0.2º. The front position is made for agile handling on winding trails, with a shorter wheelbase, higher bottom bracket, and steeper head tube angle. The back position of the Tuning Chip is made for a stable, confident ride on sketchy terrain, with a longer wheelbase, lower button bracket, and head tube angle with more slack. Changing positions of the Tuning Chip takes 5-10 minutes and can be done in a home workshop.

The Fenrir is available as a frameset and a complete build that can get started here, as well as with Otso dealers.