A Duro butyl inner tube in 20" x 1-3/8 (ETRTO 37-451) — the standard replacement tube for this size, available in the valve type and length you need.

Highlights

  • Size 20" x 1-3/8 (37-451)
  • Butyl rubber — holds air well and patches easily
  • Choose your valve type and length to suit your rim
  • Duro tube

Fit and compatibility

Fits tyres in the 20" x 1-3/8 range (ETRTO 37-451). Check your tyre's width sits inside this tube's range, and match the valve length to your rim depth — too short and a pump won't grip properly.

Duro tubes are covered against defects in materials and workmanship. Punctures, pinch flats from incorrect fitting, over- or under-inflation and valve damage from a poorly fitted pump head aren't covered.

For warranty support, return the item to Tune Cycles with your proof of purchase and we'll manage the claim with the distributor for you. This cover is in addition to your rights under the Australian Consumer Law.

  • Size 20" x 1-3/8 (37-451)
  • Butyl rubber — holds air well and patches easily
  • Choose your valve type and length to suit your rim
  • Duro tube
BrandDuro
TypeInner tube
Size20" x 1-3/8
ETRTO37-451
MaterialButyl rubber
UseAny bike running this tyre size
SKU DUR-TB-37-451
Brand Duro

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