Bontrager Schrader and Presta Valve Bike Tubes

Item No. 1643-STND-S-P
$5.99 - $9.99

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Product Description

1643-STND-S-P

Premium-quality Bontrager Standard butyl rubber tubes feature a 0.9mm wall thickness for the perfect balance of weight savings and durability.

Valve Stem Length:

  • The first value in the tube size refer's to the stem length in millimeters.
  • Stem length depends on the depth of your rim.
  • Schrader Valve - Stem Lengths: 36mm(Standard), 48mm
  • Presta Valve - Stem Lengths: 48mm(Standard), 60mm, 80mm 


Valve Types:

Schrader Valves:

  • Used on lower pressure tires, such as children's bikes and mountain bikes. The Schrader valve is also used in automotive tires.


Presta Valves:

  • Slimmer stem, often threaded to accept a locking ring, which holds the stem securely in the rim. Used for higher pressure tire such as a road bike. To inflate and deflate the Presta valve, the top section must be unscrewed, allowing the core of the valuve to be free to move open and close. In the Presta valve it is the air pressure that shuts the valve and tightening the top section keeps it shut.
  • Presta valves vary in length depending on your rims depth. The valve stem needs to be long enough to extend through the rim hole, and be able to connect the air pump when tube is fully inflated.

Tube Size:
  • Stem Length - Wheel Diameter  X  Width Range 
  • US: Inches - ( " )
  • Metric: Millimeters - ( mm )
  • 700c Tires vary in width from 23-40mm.
  • 26, 29, 27.5 Inch tires vary in width from 1-3 inches.

Size Conversions:

27" x 1.125 - 1.25  =   700 x 28-32C

27" x 1.375 - 1.75  =   700 x 35-44C


(1-1/8  -  1-1/4)  =  (1.125 - 1.25)

(1-3/8  -  1-3/4)  =  (1.375 - 1.75)

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