Tomorrow I will set a new TPMS on my st1300, what is the average tire temp on the bike tires?
thanks for the help in advance.
P.B.
thanks for the help in advance.
P.B.
All of which shows why we check cool pressure.My TPMS shows the rear getting up to ambient + 10-13C, where the front is generally ambient +2-3C. Front pressure will rise from 42 to 46, and rear from 42 to 51psi.
Exactly.You should set the pressure to specs, and see how the temperature rises with riding, which it will, along with pressure.
And that's all I do and care about. In these parts there's little temperature swing and even if there were I probably wouldn't care. Start out 'cold' and ride.All of which shows why we check cool pressure.
It is actually possible to adjust the pressure while tires are hot - as long as you know how much you need to add. If always look at the pressure in the morning (cold tire), and if it's low I simply note by how much (e.g. 2 psi). Once I return home (with hot tires) I then simply add 2 psi, so e.g. bring the tire from 46 psi to 48 psi. The next morning it will be 42 psi (more or less). Just saying that you don't have to wait until the tires cool off...Exactly.
Always set pressures when the tires are stone cold (for example, after having sat overnight in the garage). Temperature and pressure will rise once you start to ride. You don't need to be concerned with the pressure rise during riding, nor with the temperature rise during riding, as long as the pressures were set to spec when the tires were cold.
If you live in an area that has significant seasonal temperature variations (basically, anywhere that gets snow in the winter), you might see a 3 to 4 PSI pressure drop between July and November, assuming a perfect tire & wheel that has no leakage whatsoever. This is normal, just add a wee bit of air in the late fall to bring pressure up to spec. No need to remove air in the spring, because no tire is so perfect that it won't lose that amount of pressure over the winter.
Michael
I think the rear tire temperature's greater increase has more to do with the ST's roughly 42%/58% F/R weight ratio and motive power transmitted thru the tire to the ground causing the tire to flex much more than a front tire does.I find my rear ST tire gets pretty hot on long rides, I'd like to think it the spirited riding but its more likely the rear wheel assembly acting as a heat sink for the engine, this calculator http://physics.bu.edu/~schmaltz/deflate.html could be used to estimate the highest probable temp/pressure
Rear has less airflow, sits in a warmer area, has larger road contact area, and of course all the friction from acceleration...I think the rear tire temperature's greater increase has more to do with the ST's roughly 42%/58% F/R weight ratio and motive power transmitted thru the tire to the ground causing the tire to flex much more than a front tire does.
9 psi is about a 21% rise in pressure on a 10-13C temperature rise, and all from a starting pressure that is about at target. Certainly not under-inflated. That is surprising and would be a bit alarming to me. The pressure rise from heating (pv=nrt and all that) by 13C should be about 2.3 psi.rear from 42 to 51psi.
agreed that the theoretical rise is around 2.3-ish based on the math for that temp rise, but it seems like most TPMS users report much more than that, not sure what explains it.9 psi is about a 21% rise in pressure on a 10-13C temperature rise, and all from a starting pressure that is about at target. Certainly not under-inflated. That is surprising and would be a bit alarming to me. The pressure rise from heating (pv=nrt and all that) by 13C should be about 2.3 psi.