Modern Vespa

Exactly. Those who check their tyres once in a blue moon would have a rude awakening.

Here's the culprit...BTW there's a valve adjustment tool that you should be aware of that allow you to tighten the valve within the valve stem. This can be overlooked but may save you some grief in wondering why you're losing pressure and can't find the "leak". This same tool can be and should be part of a bicycle tire repair kit. You can screw it onto your preexisting valve stem.

Columbus is said to have said: "Never go to sea with two compasses. Always take one or three."

Pam

Get a digital Accutire gauge. They are under $10 at most auto parts stores/car washes and have been verified by independant testing to be extremely accurate.

Ah, so the trick is to keep trying different pressure gauges until you find two that agree. That's the same way I win an argument, I just keep asking people until I find someone who agrees with me, then I'm right!

For those who think I'm mad for not checking pressure every time I ride - the tyres do get a random "no-nail" check every day.

I find that I lose so little pressure that I have to top up more because of the loss through 'checks' than I do through normal loss.

I really don't know what this thread is all about. I check my tire pressure about every three or four weeks and have never found that they have lost pressure unless they are obviously low or flat when visually observed. Am i missing somathing here?
I prefer to give tires a " Thump" check. One should learn what the proper inflation sound is like for the various tires to be checked..A short piece of half inch pipe or EMT (conduit) provides the tool to be used.

I check mine every few weeks too,

I never cease to be amazed at folks' perception that digital gauges are somehow inherently more accurate. As a retired laboratory engineer and metrologist, I can assure you that there is absolutely NO inherent advantage to an instrument with a digital readout, at least as far as accuracy is concerned.

A high-quality analog gauge will provide far more accuracy and precision (there is a difference between these two qualities... look it up) than a cheap gauge with a digital display that reads out to several decimal places.

well I have to agree as a control room operator we use the analog gauges out in the plant to check for errors in the control room digital feed backs

These caps you talk about work on pressure, the top of the cap breaks off and the air goes out and your tire goes flat.

telling us what pressure you are actually using?