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The Lithic Fat Fork is a lightweight, versatile carbon option for fat bikes. This is a fork that Otso customers use for fat bike racing, bikepacking, and winter exploration. The 485mm axle-to-crown makes it compatible with suspension-corrected frames in place of a 100-120mm suspension fork. It has clearance for 26” x 5.4” tires and three-pack mounts for exploration, while the 740g weight makes it a light option for shorter fat bike races.


Material Carbon
Weight (including axle) 740g
Steerer Tube Length 275mm
Steerer Tube Taper 1 1/8" - 1 1/2"
Rake/Offset 51mm
Axle To Crown 485mm
Suspension Correction 100mm
Brake Mount 160mm Post native
Hub Spacing 15x150mm
Max Rotor Size 203mm
Max Tire Clearance 26x5.4" on 100mm rim
Max Rider Weight 250 lbs
Max Load (3 pack mounts) 2.5kg [5.5 lbs] per side
Axle Torque 15Nm
Compression plug torque 8Nm
Stem spacers above stem 10mm MAX
Stem spacers below stem 40mm MAX
Stem steerer tube clamp torque 6Nm MAX
Warranty 2 years

Included with fork:
• Wolf Tooth thru axle
• Compression plug
• Three M5 mounts on each side for carrying bottle cages or gear
• Hidden fender mount/brake cable clip