Overview
Configure your Fenrir Steel to your bikepacking style. If you prefer MTB bars, do it. If you prefer drop bars, build it that way instead. This bike can be configured with the components that you need to ride with comfort and confidence for multi-day tours. This is a bike with a superior ride quality that truly shines when fully loaded. So go ahead and use every last mount for cargo to keep you going for extra time on the trail.
Features
Versatile Frame Material: Custom-butted austenitic stainless steel offers a smooth ride and excellent corrosion resistance.
Adjustable Geometry: Tuning Chip™ dropout system allows you to adjust the wheelbase (up to 20mm), bottom bracket height (4mm), and head tube angle (0.2°) for optimal handling.
Multiple Configurations: Compatible with drop bars or MTB flat bars, accommodating different riding styles for gravel or mountain biking.
Generous Tire Clearance: Fits up to 29” x 2.6” or 27.5” x 2.8” tires, making it suitable for various terrains.
Comprehensive Mounting Options: Equipped with multiple mounts on the frame and fork for racks, fenders, and gear, ideal for bikepacking and long-distance touring.
Customization: Available in five sizes (XS to XL) and supports mechanical/electronic drivetrains, single speed setups, and suspension forks up to 100mm of travel.
Specs
Frame & Fork
Frame Weight: 5.7 lbs / 2580g(Large)
Fork Weight: 676g
- ENVE rigid fork
Fork Axle-to-Crown: 490mm
- Suspension-corrected for 120mm suspension fork
Fork Offset: 44mm or 52mm
Max Weight: 275 lbs
- Rider + gear
Drivetrain
Bottom Bracket Standard: Shimano English Thread BSA, Ø73mm
Maximum Chainring Size:
- 1x: 40T round
- 1x: 38T oval
Front Derailleur Type: N/A
Derailleur Hanger: Wolf Tooth Tuning Chip Right Dropout
Headset & Cockpit
Headset:
- Upper: ZS44/28.6
- Lower: EC44/40.0
Max Spacer Stack Under Stem: 40mm
Max Spacer Stack Above Stem: 10mm
Max Stem Bolt Torque: 6 Nm
Seatpost
Seatpost Diameter: Ø31.6mm
Seatpost Clamp: Ø34.9mm
Internal Dropper Routing: Yes
- Exit port on bottom of seat tube
Seatpost Insertion Depth:
- X-Small: 170mm
- Small: 210mm
- Medium: 260mm
- Large: 290mm
- X-Large: 330mm
Wheels & Axles
Front / Rear Hub Standard:
- Front: 110x15mm thru axle
- Rear: 148x12mm thru axle
Front / Rear Axle:
- Front: Ø15x110mm, TP=1.5, TL=15mm
- Rear: Ø12x187mm, TP=1.5, TL=12mm
Brakes
Rear Brake:
- Flat mount
- 74mm post mount available
- 160mm rotor
Front Brake:
- Post mount native
- 160mm post mount or 180mm flat mount
Tire Clearance
Frame Clearance:
- 2.3″ at 420mm chainstay position
- 2.8″ with 27.5″ wheels at 430/440mm chainstay positions
- 2.6″ with 29″ wheels at 430/440mm chainstay positions
Fork Clearance:
- 29″ x 2.8″ max
- 27.5″ x 3.0″ max
Mounts
Braze-Ons:
- Three bottle frame mounts
- Fender mounts
- Rack mounts
- Cable clamp mounts
| Size | S | M | L | XL |
| Recommended rider height | 5’3″-5’7″ | 5’7″-5’11” | 5’11”-6’3″ | 6’3″-6’6″ |
| Inseam | 29.5″-31″ | 31″-32″ | 32″-33″ | 33.5″-35″ |
| Stack | 605 | 623 | 642 | 660 |
| Reach | 403 | 416 | 428 | 441 |
| Effective top tube | 565 | 583 | 600 | 618 |
| Head tube angle | 68° | 68° | 68° | 68° |
| Head tube length | 100 | 120 | 140 | 160 |
| Seat tube angle | 75° | 75° | 75° | 75° |
| Seat tube length | 400 | 450 | 490 | 530 |
| Bottom bracket drop | 68 | 68 | 68 | 68 |
| Rear center | 440 | 440 | 440 | 440 |
| Wheelbase | 1110 | 1130 | 1150 | 1170 |
| Trail | 95 | 95 | 95 | 95 |
| Fork offset | 51 | 51 | 51 | 51 |
| Rigid fork axle to crown length | 495 | 495 | 495 | 495 |
Warranty
- 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.