A 4130 chromoly steel hardtail frame from Otso, designed around a 140mm travel fork for playful trail riding.

What it's for

The Hoot Steel is Otso's steel trail hardtail. Otso designed it for riders who want a hardtail that handles steep descents and rough lines, with geometry that keeps it playful on tighter trails. It is sold here as a frame for building up with your own parts.

How it works

• Size specific tubing: Otso uses 4130 chromoly with custom tubing for each frame size so the ride quality stays the same from small to XL.
• Geometry: 65 degree head tube angle, 76 degree seat tube angle, 60mm bottom bracket drop and 425mm chainstays.
• Dropper insertion: a low standover, a seat tube that extends above the top tube, straight tubing until just above the bottom bracket, and a reworked bottle mount let you run a long travel dropper.
• Evolved bottle mount: the seat tube mount is placed so its bolts do not limit dropper insertion, giving you a second bottle or gear mount.
• UDH dropouts: compatible with all drivetrains, including SRAM Transmission.

Compatibility

• Fork: designed for 140mm travel. Otso states it can also run a 150mm fork. Otso does not recommend going longer or shorter.
• Tires: up to 29 x 2.6 inch.
• Derailleur hanger: UDH.

Sizing and fit

• Sizes: S, M, L, XL.
• Otso has a size guide on its site that uses height and inseam. Measure inseam standing against a wall with a book pulled up like a saddle, not your pant inseam.

Care and service

• Warranty: Otso warrants its frames against defects in materials and workmanship for 5 years from the date of retail purchase, to the original owner.
• OMG's bike shop can do a full build on this frame.

Specs

• Material: 4130 chromoly steel, custom butted, size specific
• Head tube angle: 65 degrees
• Seat tube angle: 76 degrees
• Chainstay length: 425mm
• Bottom bracket drop: 60mm
• Fork travel: 140mm (150mm compatible)
• Tire clearance: 29 x 2.6 inch
• Dropouts: UDH
• Color: Sparkly Bronze