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Otso Arctodus Ti XT

Otso Arctodus Ti XT
  • Color: Titanium
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Big adventures require a bike that can rise to the occasion. Arctodus is named after Arctodus simus, an Ice Age behemoth that was the largest bear to ever walk the Earth. Like its namesake, Arctodus the bike is versatile, strong, and ready to explore. It has adjustable geometry, a durable steel frame, a massive front triangle for a frame bag, lots of cargo mounts, and can clear the biggest fat bike tires on the market. Arctodus is ready for afternoon exploration, polar expeditions, and everything in between.

- The Biggest Tire Clearance

Arctodus was built around a 26" x 4.8" tire for optimal handling and control on loose trails. It can fit the biggest fat bike tires in the world. The biggest fat tire on the market is 26" x 5.05" and Arctodus eats them like a snack with room to spare. Same as 27.5" x 4.5", the biggest 27.5" tire available. Arctodus is the only bike to clear tires this big with a 12-speed drivetrain without chain interference. When a bike is created for big rides with fresh snow, it needs to fit tires that were designed for the same reason. This is a bike that prays for snow and cuts its own trail.

- One Bike, Three Wheelbase Lengths

A key feature in all Otso bikes is adjustable geometry and the ability to adapt the bike for the ride ahead. The patented Tuning Chip rear dropout system can change wheelbase length by up to 20mm, raise or lower the bottom bracket height by up to 4mm, and change the head tube angle by +/- 0.5º. Use the rear position when the trails are loose and you need as much control as you can get. Use the front position when the snow is firm and the trails let you take turns with a little speed. No matter the conditions, Arctodus has an answer.

- Designed for Exploring

There's no need to wait for the trail groomer. Arctodus was made for foot trails, forest paths, and snow-covered frozen lakes. The bombproof steel frame can withstand the demands of an expedition. A large front triangle can fit a healthy full-frame bag. The carbon fork has mounts on either side for cargo. A rear frame can be attached via mounts on the seat stays and Tuning Chip hardware. Even the geometry is catered for exploration, with extra trail for optimal flotation and bottom bracket height that will ride above deeper snow. Whether you're exploring local trails or a national forest, you can trust Arctodus to keep you riding.

- Narrow Q Factor

Arctodus has a 100mm bottom bracket. This is 30-40mm narrower than other fat bikes that have the same tire clearance. Ride with massive tires without compromising handling.

- Suspension Correct

All Otso frames feature suspension-corrected geometry. Arctodus is compatible with suspension forks that have up to 120mm of travel. A few options are available on the Custom Bike Builder.

- Stability and Floatation

Arctodus geometry was designed for optimal riding on fresh trails. The 68º head tube angle paired with massive tires gives Arctodus more trail than other fat bikes. Even the BB height was selected for clearance in deep snow.

- Dropper Compatible

Snowy trails are good with dropper posts, too. A port near the bottom bracket fits a cable and housing for a cable-actuated dropper post.

Frame SizeSmallMediumLargeX-Large
Effective top tube 589mm 610mm 632mm 663mm
Nominal head tube angle 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 90mm 90mm 100mm 140mm
Nominal seat tube angle 74° 74° 74° 74°
Seat tube length 380mm 420mm 465mm 510mm
Bottom bracket drop 80mm 80mm 80mm 80mm
Chainstay length 440-460mm 440-460mm 440-460mm 440-460mm
Wheelbase 1119-1139mm 1140-1160mm 1162-1182mm 1197-1217mm
Trail 94mm 94mm 94mm 94mm
Fork offset 51mm 51mm 51mm 51mm
Rigid fork axle to crown length 485mm 485mm 485mm 485mm
Stack 607mm 607mm 617mm 654mm
Reach 415mm 435mm 455mm 475mm
Standover 707mm 736mm 773mm 810mm
Frame SizeRecommended Rider Height (in)Recommended Rider Inseam (in)
Small 4'9"-5'5" 29"-32"
Medium 5'5"-5'9" 31"-33"
Large 5'9"-6'1" 32"-35"
X-Large 6'1"-6'7" 34"-37"


Frame Titanium with Tuning Chip™? dropout system
Fork Lithic full carbon fork, 15mm thru axle
Wheels Front: Lithic Cryolite 100, 26", 97mm inner width, 150x15 thru axle
Rear: Lithic Cryolite 100, 26", 97mm inner width, 197x12 thru axle
Tires Schwalbe Al Mighty 26x4.8
Bottom Bracket Race Face, BSA 100mm
Crankset Race Face Next SL Carbon, Wolf Tooth CAMO 32T Round Chainring: 170mm S | 170mm M | 175mm L | 175mm XL
Shifters Shimano Deore XT M8100, 12-speed
Rear Derailleur Shimano Deore XT M8100, 12-speed
Cassette/Freewheel Shimano Deore XT M8100, 10-51T, 12-speed
Chain Shimano SLX 12-Speed
Brakes Shimano Deore XT M8100
Handlebars FSA SL-K PRO 18 Riser Handlebar 31.8x760mm, 18mm rise
Tape/Grips Wolf Tooth Fat Paw Grips, black
Stem Aluminum +/- 7, 60mm S | 70mm M | 80mm L | 90mm XL
Headset Wolf Tooth Performance headset
Seatpost FSA SL-K Carbon, 31.6mm x 400mm
Saddle WTB Volt 142mm

* Subject to change without notice.

Part Numbers

Option MPN
Titanium / Small ARC-TI-SLX-S
Titanium / Medium ARC-TI-SLX-M
Titanium / Large ARC-TI-SLX-L
Titanium / X-Large ARC-TI-SLX-XL