On a side note, I was riding yesterday in 45* weather and my FOBO alarm went off. I keep my rear tire (still a Kenda) @ 26#. FOBO was screaming at me that it got to 31.2#. Not sure why it was so upset although that did seem to be quite a bit of increase considering the ambient temp. I was less concerned with that than I would have been had the pressure dropped. According to FOBO, it's now back down to 26.5#. I love this FOBO app.
An 'over-pressure alarm' like that will occur because too much pressure increase may be an indication that the tire is under-inflated for the ambient temps &/OR for the riding you're doing, and the pressure in your tire has risen too much from it's cold start/base setting.
Depending on the system, these 'too much increase' alarms can be triggered by the actual pressure increase, or by the temperature increase that effectively causes the pressure increase in the first place - either serving to warn you that a rise like that might be due to a slow leak in the tire lowering the volume of air inside it sufficiently to be a risk (obviously not the case here, or it would now show a lower pressure!); or that the material/layers the tire is made of are at risk of 'de-construction' due to the increase in the tire's temperature.... albeit, you're probably not quite at that stage with just an 'almost 6 psi' increase from cold - but then again, if it increased that much fairly quickly, maybe so?! :dontknow:
But you also need to consider what you were doing in the 20-30 minutes of riding immediately beforehand - if you were riding 'somewhat more spiritedly' than usual, that temp increase & the consequent increased risk to your tire might simply be due to that 'over-exuberance', and if you slow down & the alarm stops as the tire's pressure/temp returns to its normal range rather than showing a lower than normal pressure, then that's probably what it was, altho.... if you were here in Oz, you'd also need to consider if you were riding on a hotter road surface, or if that tire was more exposed to sunlight, but considering where you are/the ambient temps you report, there's probably not too much of a risk of either of those.... there again, it could be that your FOBO was responding to a temp/pressure increase that was largely in the valve stem itself, and not actually in the tire?!? As I've mentioned before, it does sometimes happen with these end of valve stem sensors - warnings or pressure changes being reported that other devices can't detect any reason for, and that (sometimes) seemingly 'self correct'....could've been due to quite a few things, and unless you can identify anything that was clearly different in the conditions or what you were doing/how you were riding at the time.... :dontknow:
That said, it's been a while, but I thought the FOBO system allowed you to set an upper & lower pressure or temp limit for the alarms, altho most systems do generally have default limits - often about 4psi....
opcorn:
