This is Surly’s 29 x 3-inch Presta valve tube. It fits their Knard tires and is made of butyl rubber.

Surly Inner Tube to fit a wide range of plus-size and fat bike tires. - Labeled Size: 26 x 3.0 - 4.8 - Weight: 310 g - Valve Core: Removable - Shaft Type: Threaded - ISO Width (mm): 76mm–100mm - Tube Compound: Butyl - ISO Diameter: 559 / 26-inch MTN - Valve: Presta Short 32-40mm

- Butyl rubber - 60mm-long Presta valve (smooth/removable core) - 700 x 25-30 (27 x 1-1 1/8)

- Butyl rubber - 48mm-long Presta valve (smooth/removable core) - 26 x 1 (650 x 18-23)

- Butyl rubber - 32mm-long Presta valve (smooth/removable core) - 700 x 28-35 (27 x 1 1/8-1/4)

- Butyl rubber - 48mm-long Presta valve (smooth/removable core) - 26 x 1.9-2.35

- Butyl rubber - 48mm-long Presta valve (smooth/removable core) - 27.5 x 2.1-2.35 (650B)

- Butyl rubber - 60mm-long Presta valve (smooth/removable core) - 700 x 18-23 (27 x 1)

- Butyl rubber - 32mm-long Presta valve (smooth/removable core) - 16 x 1 3/8 (349 x 25)

- Butyl rubber - 32mm-long Presta valve (smooth/removable core) - 16 x 1.35 (305 x 37)

- Butyl rubber - 32mm-long Presta valve (smooth/removable core) - 20 x 1 (451 x 19)

• Butyl rubber • 32mm-long Presta valve (smooth/removable core) • 20 x 1 1/8 (451 x 25)

- Butyl rubber - 32mm-long Presta valve (smooth/removable core) - 20 x 1 3/8 (451 x 32)

- Butyl rubber - 32mm-long Presta valve (smooth/removable core) - 20 x 1.25-1.5 (406 x 37-45)

- Butyl rubber - 32mm-long Presta valve (smooth/removable core) - 24 x 1 (520 x 19-23)

- Butyl rubber - 32mm-long Presta valve (Threaded/removable core) - 26 x 1.5-1.95

- Size: 26 x 1.00 - Valve Type: Presta - Valve Length: 32mm - Valve Core: Removable - ISO: 559 - Flat Fold WIdth: 25mm - Wall Thickness: 0.9mm

- Valve type: Presta, threaded - Valve length: 60mm - Tube size: 700 x 35-40

- Butyl rubber - 32mm-long Schrader valve - 27.5 x 2.1-2.35 (650B)

- Butyl rubber - 48mm-long Schrader valve - 27.5 x 2.1-2.35 (650B)

- Butyl rubber - Schrader valve - 12 1/2 x 2 1/4

- Butyl rubber - Schrader valve - 14 x 1.75

- Butyl rubber - Schrader valve - 16 x 1 3/8 (349 x 25)

- Butyl rubber - Schrader valve - 18 x 1.75

- Size: 18 x 2.125 - Valve Type: Schrader - Valve Length: 32mm - Valve Stem: Smooth - Valve Core: Removable - Flat Fold Width: 51mm - Wall Thickness: 0.9mm

- Butyl rubber - Schrader valve - 20 x 1 1/8

- Butyl rubber - Schrader valve - 20 x 1 3/8

- Butyl rubber - Schrader valve - 20 x 1.35-1.5 (406 x 37)

- Butyl rubber - Schrader valve - 20 x 2.75-3

- Butyl rubber - Schrader valve - 22 x 1.75