The Origin8 Tsunami 26x4.0 folding fat bike tire is built for low-pressure riding on snow, sand, and other loose terrain, using widely spaced, siped lugs to create traction while limiting unnecessary rolling drag.

Large sipes increase the number of gripping edges, while staggered corner lugs create a stable and predictable platform when turning. This exact 26x4.0 version uses a supple 120 TPI folding casing, has an ISO 559 diameter, is rated to 20 PSI, and weighs 1175 g | 41.4 oz. Those details distinguish it from the other Tsunami widths and bead constructions.

Key Features

• Siped Knobby Tread: Large cuts in the lugs create additional gripping edges for soft and loose conditions.
• Open Lug Spacing: Well-spaced tread blocks support low-pressure rolling in snow, sand, and similar terrain.
• Cornering Lugs: Staggered outer lugs provide a stable transition when the bicycle is leaned into turns.
• 120 TPI Casing: The folding construction is specific to this 26x4.0 variant.
• Fat-Bike Size: ISO 559 tire sized 26x4.0 for compatible fat-bike rims and frames.

Benefits

• Creates multiple traction edges for riding where a conventional narrow tire would sink or slip.
• Supports predictable steering while operating at the low pressures used by fat-bike tires.
• Clearly identifies the 26x4.0, folding-bead version so shoppers can avoid mixing it with other Tsunami variants.

Best For

• Fat-bike riding on snow, sand, loose trails, and other low-pressure applications.
• 26-inch fat-bike wheels with rim and frame clearance for a 26x4.0 tire.

Specifications

• Brand: Origin8
• Model: Tsunami
• Product Type: Folding fat bike tire
• Size: 26x4.0
• ISO Diameter: 559
• Bead: Folding
• Casing: 120 TPI
• Tread Style: Knobby
• Maximum Pressure: 20 PSI
• Weight: 1175 g | 41.4 oz
• Color: Black/Black
• Reflective Sidewall: No
• SKU: BI.590710
• UPC: 888571023921