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.
Tire temperature
- Thread starter leonides
- Start date
You should set the pressure to specs, and see how the temperature rises with riding, which it will, along with 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.
Temp rise will vary with the kind of riding you are doing, ambient temperature of the air and road, and loading of the bike. Once you learn what your tires' pressure and temperature are under various conditions, you will be able to recognize an unusual temp/pressure situation.
All of which shows why we check cool pressure.
I set my temp settings on my TPMS really high so the temp alarm never comes on. Tire temps are something we have no control over, so as long as your tire pressures are good when cold, don't worry about temps. My .02.
Highest temp I have seen is about 120 F on the rear and around 100 F on the front during extended riding in 95*+ temps.
I have an internal temp sensor, I measure about 40° F rise on the rear (over ambient) and 30°F rise on the front. I have seen 150°+ when out west on tour, not much you can do about it just know that the tire life is getting reduced. It's amazing how much just a little rain will cool the tires down. Also the temperature will drop pretty quick at first when you get off the highway, like within a mile of slowing down I can see the temps dropping.
CYYJ
Michael
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
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.
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
Yeah, forget tire temps.. they mean nothing.. but the pressure means everything... temps on the rear will typically be 10-20 degrees hotter than the front but it's not like a trailer where a hot wheel might be a bad bearing... our wheels would dissipate that kind of heat before it ends up meaning anything and the bearing would go far before the temps look all that abnormal.
The pressure is the main thing to care about.
The pressure is the main thing to care about.
sky.high
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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
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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.
Rear has less airflow, sits in a warmer area, has larger road contact area, and of course all the friction from acceleration...
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.
sky.high
Site Supporter
All I know is the rear wheel drive assembly after a long ride on a hot day on my ST1300 is really warm to the touch no idea what temp it gets to but a lot of that heat is being dissipated into the wheel rim, any got an infrared heat sensor?
We've just got our first snow fall so I won't be able to perform a live test till 2020 LOL
We've just got our first snow fall so I won't be able to perform a live test till 2020 LOL
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I remember a friend who raced said he intentionally lowered cool pressure so the heat gain from flexing ended up with a higher pressure that was what he wanted when the tires were hot.
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.
just to be anal about the pressure rise, absolute should be used instead of gauge pressure to compute the percentage rise, so instead of 21% (9/42) its about 16% rise (9/57).