Overview
The Otso Arctodus Ti Frameset elevates the fat bike experience by combining the supreme resilience and natural vibration damping qualities of titanium. This frameset is engineered for adventurers who demand the best in durability and performance across diverse and challenging terrains—from snowy paths to sandy trails.
Features
Titanium Construction: Offers a lightweight yet highly durable frame that absorbs vibrations, enhancing comfort during long rides.
Adaptable Geometry: Equipped with Otso’s innovative Tuning Chip system, this frameset allows for adjustments in wheelbase and head tube angle, adapting to various riding styles and terrains.
Expansive Tire Clearance: Compatible with a wide range of tire sizes, this frame can handle 27.5″x3.8″ to 26″x5.05″ tires, providing flexibility and top-notch traction across different surfaces.
Sleek Integration: The frame includes internal routing to keep cables neatly tucked away and safe from the elements, contributing to a cleaner look and reduced maintenance.
Specs
- Bottom Bracket: 100mm BSA threaded
- Q Factor: 205mm with Race Face Aeffect crankset
- Maximum Chainring Size: 36T round or 34T oval
- Front Derailleur: None (1x only bike)
- Headset: ZS44 upper, EC44 lower
- Seatpost Diameter: Ø31.6mm, accommodates internally routed dropper post
- Seatpost Clamp: Ø34.9mm
Hub Standards:
- Front: 150x15mm thru axle
- Rear: 197x12mm thru axle (rear end offset 5mm to the drive side, so wheel must be dished to the non-drive side)
Axles:
- Front: Ø15x150mm, TP=1.5, TL=12mm
- Rear: Ø12x235mm, TP=1.5, TL=14mm
- Rear Dropouts: Tuning Chip Dropout with adjustable chainstay length, offset 5mm
- Derailleur Hanger: Tuning Chip Right Dropout
Brakes:
- Rear: 74mm post mount (160mm native, 180mm max)
- Front: 74mm post mount (160mm native, 180mm max)
Fork:
- Axle-to-Crown: 485mm, suspension corrected for 100-120mm travel forks
- Offset: 51mm
Weights:
- Bare Frame: 2429g (S) | 2487g (M) | 2550g (L) | 2621g (XL)
- Fork (Otso rigid): 650g
Tire Clearance:
- Frame: Up to 26″ x 5.25″, 27.5″ x 4.5″, or 29″ x 3″ in all Tuning Chip positions
- Fork: Up to 26″ x 5.4″ on 100mm rim
Fork Note: Using a 120mm suspension fork will slacken the head tube angle by 0.5˚
Frame Bag Dimensions: Small, Medium, Large, X-Large
Seatpost Insertion Depth:
- 220mm (S)
- 270mm (M)
- 310mm (L)
- 350mm (XL)
- Max Weight (Rider + Gear): 275 lbs.
Max Spacer Stack:
- Under Stem: 40mm
- Above Stem: 10mm
- Max Stem Bolt Torque: 6 Nm
Warranty
Warranty Coverage:
- All Otso frames are warranted against defects in materials and workmanship for 5 years from the date of retail purchase.
- This warranty applies to the original owner only and is not transferable.
- Please keep your sales receipt or order number for any warranty claims to ensure a quick resolution.
What’s Not Covered:
- Damage from improper assembly, maintenance, or user/assembler inexperience.
- Modifications, neglect, misuse, competition, commercial use, or accidents.
- Installation of incompatible components, parts, or accessories.
- Normal wear and tear, or damage to paint, surface finish, or aesthetics.
- Compatibility of original components with a replacement frame is not guaranteed.
- Costs for labor, parts removal, refitting, or re-adjustment, including wheel rebuilds.
Claim Process:
- Warranty claims are limited to the repair or replacement of the defective frame, at Otso’s discretion.
- This warranty does not cover incidental or consequential damages.
Legal Information:
- This warranty gives you specific legal rights, which may vary based on location. It does not affect your statutory rights.