Arctodus
BUILT FOR WINTER EXPLORING
bUILD YOUR ARCTODUS NOW
Otso bikes are available to purchase here on our website or with our network of Otso dealers. Our Custom Bike Configurator allows you to select most component options on your bike, including drivetrain, wheelset, tires, handlebars, seatpost, anodized accent color option, and more. Arctodus is also available as a frameset if you already have parts ready to go at home. We’re happy to talk through options to help you build the Arctodus that is perfect for you and your riding style.
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.
Otso has a small (but growing!) network of bike shops that sell our bikes. Click the button to the right to see a map of all Otso dealers. If there is not one in your area, you can still build and order any of our bikes right here on our website. Give us a shout at sales@otsocycles.com with any questions.
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", which is the biggest 27.5" tire available. Arctodus is the only bike to clear tires this big with a 12-speed drivetrain without chain interference. We achieve this by using a 5mm offset with the rear wheel. 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.
ADJUSTABLE GEOMETRY
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. This frame is also compatible with Wolf Tooth GeoShift 1º and 2º Angle Headsets, effectively unlocking five head tube angles from 66.5º to 70.5º. 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 rack can be attached via mounts on the seat stays. Even the geometry is catered for exploration, with optimal stability in deep snow. Whether you're exploring local trails or a national forest, you can trust Arctodus to keep you riding.
AND SO MUCH MORE ...
NARROW Q FACTOR
Arctodus has a 100mm bottom bracket. This is 20mm 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 & FLOTATION
Arctodus geometry was designed for optimal riding on fresh trails. The 68.5º head tube angle paired with massive tires gives Arctodus more stability than other fat bikes.
DROPPER COMPATIBLE
A dropper post is a game changer in deep snow and technical winter riding. Arctodus has ample seat tube depth for longer travel dropper posts and a routing port just above the bottom bracket.
TECHNICAL DETAILS
- Build Specs
- Frame Specs
- Geometry
- Tires & Rims
- Racks & Fenders
Arctodus | SLX | Custom Bike Configurator |
---|---|---|
Frame | Chromoly with Tuning Chip™️ dropout system | Chromoly with Tuning Chip™️ dropout system |
Fork | Lithic full carbon fork, 15mm thru axle | Lithic full carbon fork, 15mm thru axle |
Headset | Wolf Tooth Performance headset | Wolf Tooth, Custom Options |
Rear derailleur | Shimano SLX M7100, 12-speed | Custom Options |
Front derailleur | N/A | N/A |
Shifter | Shimano SLX M7100, 12-speed | Custom Options |
Cassette | Shimano SLX M7100, 10-51T, 12-speed | Custom Options |
Brakes | Magura MT4 | Custom Options |
Cranks | Race Face Aeffect, Wolf Tooth CAMO 32T Round Chainring: 170mm S | 170mm M | 175mm L | 175mm XL | Custom Options |
Bottom bracket | Race Face, BSA 100mm | Race Face, BSA 100mm |
Handlebar | Aluminum, 31.8mm x 780mm, 20mm rise | Custom Options |
Grips | Wolf Tooth Fat Paw Grips, black | Wolf Tooth, Custom Options |
Stem | Aluminum +/- 7, 60mm S | 70mm M | 80mm L | 90mm XL | Custom Options |
Seatpost | Aluminum, 31.6mm x 400mm | Custom Options |
Seatpost clamp | Wolf Tooth 34.9, black | Wolf Tooth, Custom Options |
Saddle | WTB Volt 142mm | WTB Volt 142mm |
Wheels | Lithic Cryolite 100, 26", 97mm inner width, 150x15 thru axle front, 197x12 thru axle rear | Custom Options |
Tires | Schwalbe Al Mighty 26x4.8 | Custom Options |
Chain | Shimano SLX 12-speed | Custom Options |
Frame Sizes | S, M, L, XL | S, M, L, XL |
Weight (size M, tubeless) | 34.4 lbs | Varies |
Frame Size | Small | Medium | Large | X-Large |
Recommended rider height | 4'9"-5'5" | 5'5"-5'9" | 5'9"-6'1" | 6'1"-6'7" |
Recommended rider inseam | 29"-32" | 31"-33" | 32"-35" | 34"-37" |
Effective top tube | 589mm | 610mm | 632mm | 657mm |
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 | 120mm |
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 | 1189-1209mm |
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 | 635mm |
Reach | 415mm | 435mm | 455mm | 475mm |
Standover | 707mm | 736mm | 773mm | 810mm |
Approved fit (tire width <126mm):
26x4.8" Schwalbe Al Mighty on Lithic Cryolite 100
26x5.0" Terrene Johnny 5 on Lithic Cryolite 100
*For wheel/tire combinations not listed above, the max tire width should not exceed 126mm if you are running 12-speed, and clearance to the frame should never be less than 6mm.
**Tire width and runout can vary by a couple millimeters, and tubeless tires will stretch slightly over time. Wheel dish will also affect chain clearance. Our tests were performed with new tires at 10psi on wheels dished 5mm to the non-driveside.
Compatible fenders
PDW - Mud Shovel Front and Rear Fenders
SKS - Fatboard Fender Set
compatible racks
Salsa - Alternator Rear Rack 190 / 197
Topeak - Uni Super Tourist Fat Rear Rack
Blackburn - Outpost Fat Rear Rack
Surly - Rear Disc Rack Wide
Frame Bag Dimensions
(click on links to view PDF drawings)