Simple but effective valve cap that constantly monitors your tyre pressure and provides a visible warning when they are low.
Each cap has a minimum pressure rating. When your tyre pressure is above this a green ring shows and you're ok.
If pressure drops below the minimum rating a red ring shows and you know it's time check and inflate your tyre.
Select the lowest PSI limit nearest to your tyre manufacturer's recommended tyre pressure.
PLEASE NOTE THESE ARE ITEMS ARE SUPPLIED INDIVIDUALLY, NOT AS A PAIR, DUE TO MOST BIKES RUNNING DIFFERENT RECOMMENDED FRONT AND REAR TYRE PRESSURES.