Otso Warakin Stainless Frame


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The Otso Warakin Stainless frameset is designed to accommodate a wide range of tire sizes and features adjustable geometry for a customized riding experience.


The Warakin is an all-road adventure bike. This frame is built using austenitic stainless steel tubing and features a brushed finish with bead-blasted graphics. Austenitic stainless steel provides the supple yet lively ride quality of a cromoly frame with the beauty and corrosion resistance of titanium.

49cm 52cm 54cm 56cm 58cm 60m
Recommended rider height 5’0″-5’2″ 5’2″-5’4″ 5’4″-5’8″ 5’8″-6’0″ 6’0″-6’2″ 6’2″-6’5″
Recommended rider inseam 27″-29″ 28″-30″ 30″-33″ 32″-34″ 33″-35″ 34″-37″
Effective top tube 510mm 530mm 545mm 565mm 580mm 600mm
Nominal head tube angle 70° 70.5° 71° 71.5° 72° 72°
Tuning Chip induced head/seat tube angle change ±0.2° ±0.2° ±0.2° ±0.2° ±0.2° ±0.2°
Head tube length 87mm 95mm 115mm 140mm 165mm 185mm
Nominal seat tube angle 75° 74.5° 74° 73° 72.5° 72°
Seat tube length 470mm 505mm 530mm 550mm 570mm 590mm
Bottom bracket drop 68-72mm 68-72mm 68-72mm 68-72mm 68-72mm 68-72mm
Chainstay length 420-440mm 420-440mm 420-440mm 420-440mm 420-440mm 420-440mm
Wheelbase 1010 – 1030mm 1017-1037mm 1023-1043mm 1028-1048mm 1032-1052mm 1046-1066mm
Trail 72mm 71mm 70mm 67.5mm 65mm 65mm
Fork offset 47mm 47mm 47mm 47mm 47mm 47mm
Rigid fork axle to crown length 420mm 420mm 420mm 420mm 420mm 420mm
Stack 540mm 549mm 570mm 596mm 622mm 641mm
Reach 370mm 378mm 381mm 383mm 384mm 392mm
Standover 730mm 760mm 780mm 800mm 820mm 840 mm


Stainless Steel Construction: Made from austenitic stainless steel, providing a smooth, lively ride and exceptional durability.

Adjustable Geometry: The Tuning Chip™ dropout system allows for customizable wheelbase and bottom bracket height, adapting to different riding styles and terrains.

Wide Tire Clearance: Compatible with 700c x 50mm, 650b x 50mm, and 29″ x 2.0″ tires, offering versatility for various riding conditions.

Multiple Mounts: Equipped with mounts for racks, fenders, and bottle cages, making it suitable for bikepacking and long-distance touring.


Bottom bracket standard 68mm BSA threaded
Q-factor 146mm with Shimano RS510 crankset
Maximum chainring size 2x 53T round; 1x 50T round or 46T oval
Front derailleur type 31.8mm clamp, bottom pull
Headset ZS44/28.6 upper, EC44/40.0 lower
Seatpost diameter Ø27.2mm
Internal dropper post routing Yes. Exit port on bottom of seat tube
Seatpost clamp Ø31.8mm
Front/rear hub standard 100x12mm thru axle / 142x12mm thru axle
Front/rear axle Ø12x125mm front, TP=1.5, TL=15mm / Ø12x180mm rear, TP=1.5, TL=12mm
Derailleur hanger Wolf Tooth Tuning Chip Right Dropout
Rear brake (rotor) Flat mount, 74mm post mount available(160mm)
Front brake (rotor) flat mount native, 74mm post mount adapter available (160mm)
Fork axle-to-crown 420mm
Fork offset 47mm
Bare frame weight (54cm) 4.7lbs (2120g)
Fork weight (Lithic Hiili) 490g
Tire clearance (frame) 40mm at 420mm chainstay position, 50mm at 430/440mm chainstay positions
Tire clearance (fork) Max clearance 29″ x 2.1″ (54-622)
Braze-ons Three bottle frame mounts, fender, rack, cable clamps, two three-pack mounts on fork
Frame Bag Dimensions 49cm 52cm 54cm 56cm 58cm 60cm
Seatpost Insertion Depth Small 250mm; Medium 290mm; Large 320mm; X-Large 310mm
Max weight (rider + gear) 275 lbs.
Max spacer stack under stem 40mm
Max spacer stack above stem 10mm
Max stem bolt torque 6 Nm


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.