The two most common valve types these days are Presta valves and Schrader valves. 

Schrader valves are most commonly found on bikes with wide rims and are the same style you’ll find on most cars. 

This style inflates quite easily with any regular air pump.

Presta valves are a lot narrower and are commonly found on higher end bikes with narrow rims. 

They are a little trickier to inflate as they use a manual lock-nut to open the valve for inflation.

Rather than purchase a specialised pump you can inflate a Presta valve using a regular air pump if you have this handy adaptor. 

You are buying two and we are giving you two as spares so we will be sending you four!

Very high quality Knurled brass from top brand 'Joe No Flats' 
Rubber O-Ring for perfect seal (do not confuse these with cheap no brand versions that do not have a seal)
Perfect for easy inflation of Presta valve tyre using a Schrader valve pump

Converts French/Presta valve to Schrader/American valve
Width: 7.3mm to 9.9mm
Length: 15.8mm