RE: Tyre pressure - 5

Zitat von himoverthere im Beitrag #54

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Zitat von Varnish im Beitrag #53

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I hope this isn't hijacking this thread. My R1200 rs sport se has a TPM that has automatic temperature compensation to provide a readout which indicates the pressure as though the temperature is 20 deg C

Why does the the tyre pressure alter when I go out for a ride. The ambient temperature is 20 deg C when I leave for a run (36/42), during the run the pressures may rise by a few psi.(39/45) the next day again at 20 deg C the pressures are back to normal 36/42
surely if the readout is temperature compensated the pressure should not change

Or

is the temperature compensation in relation to the air temperature not the tyre temperature

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On the 1250, I am fairly sure that it is not temperature compensated. Mine read higher as the tyres heat. The handbook says to ignore that as it is within expectations as far as I remember.

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Zitat von MexicoMike im Beitrag #60

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Zitat von Freddyfruitbat im Beitrag #44

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.... relevant youtube page:

"42 psi rear and 36 psi front have been the recommended tire pressures for every motorcycle tire brand and model since the dawn of time. You'll find 42/36 on every motorcycle at every dealership in the United States if not the world. Welcome to the 21st Century where you can determine your own tire pressures."

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Since the dawn of time? Not hardly. Those pressures weren't commonly used on motorcycles until fairly recently. ...

If you plan to push the bike hard, the only way to know what is the best pressure FOR YOU and the way you ride is to try different pressures and see what works best. In my experience, less than factory-recommended has almost always worked better for me but, of course, that doesn't mean it will work better for someone else.

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"Oh - and an important point - make sure you check your tire pressure monitor for accuracy. (I'm thinking of this because I got a newly calibrated digital monitor that suggests one of my 45 year-old on-pump gauges - Silca track pump - is off by 20%."

Or maybe the Silca track pump is suggesting your new digital monitor is off by 20%!

I have two digital humidity gauges that differ by 15% sitting in the same spot. Once thing I have always wondered...since the physical world is analog, not digital, it requires an analog device to read it. Therefore, a digital gauge of any kind is just converting an analog reading to a digital readout. I figure it can be off in two different places -the analog section and the digital section!!

However, in this case, my experience with Silca makes me totally agree with your concern!

Zitat von MexicoMike im Beitrag #63

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"Oh - and an important point - make sure you check your tire pressure monitor for accuracy. (I'm thinking of this because I got a newly calibrated digital monitor that suggests one of my 45 year-old on-pump gauges - Silca track pump - is off by 20%."

Or maybe the Silca track pump is suggesting your new digital monitor is off by 20%!

I have two digital humidity gauges that differ by 15% sitting in the same spot. Once thing I have always wondered...since the physical world is analog, not digital, it requires an analog device to read it. Therefore, a digital gauge of any kind is just converting an analog reading to a digital readout. I figure it can be off in two different places -the analog section and the digital section!!

However, in this case, my experience with Silca makes me totally agree with your concern!

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Zitat von Lee im Beitrag #64

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Zitat von MexicoMike im Beitrag #63

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"Silca track pump - is off by 20%."

Or maybe the Silca track pump is suggesting your new digital monitor is off by 20%!

I have two digital humidity gauges that differ by 15% sitting in the same spot. Once thing I have always wondered...since the physical world is analog, not digital, it requires an analog device to read it. Therefore, a digital gauge of any kind is just converting an analog reading to a digital readout. I figure it can be off in two different places -the analog section and the digital section!!

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Just kick the tire

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Zitat von Ray B im Beitrag #65

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A lost art. ...

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Never understood why, same tyres, with different pressure advice when it is the tyre footprint we need for stability and safety.

My recently departed 2005 R1200ST had solo 32/36 and two up with panniers of 36/42 (2.5/2.9 bar ?) as the owners manual advice. Same with my R1200S (2007 manual ohlins etc)

Since then 2013 R1200R, 2015 R1200RS and 2017 R1200RS (all with ESA versions) had a standard 36/42 tyre pressue for solo/panniers/two up with panniers/fully loaded.

It seems the variable tyre pressure is no longer required, the esa will cope on a set tyre pressure.

Anyone with a 'manual, non-esa bike seems to get the 36/42 advice in the manual where it seems logical that the old lower pressures would have been suitable.

Zitat von Dave H im Beitrag #67

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Never understood why, same tyres, with different pressure advice when it is the tyre footprint we need for stability and safety.

My recently departed 2005 R1200ST had solo 32/36 and two up with panniers of 36/42 (2.5/2.9 bar ?) as the owners manual advice. Same with my R1200S (2007 manual ohlins etc)

Since then 2013 R1200R, 2015 R1200RS and 2017 R1200RS (all with ESA versions) had a standard 36/42 tyre pressue for solo/panniers/two up with panniers/fully loaded.

It seems the variable tyre pressure is no longer required, the esa will cope on a set tyre pressure.

Anyone with a 'manual, non-esa bike seems to get the 36/42 advice in the manual where it seems logical that the old lower pressures would have been suitable.

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Bored, alcohol and bored, I think I already said that/this

Dejavue is just a memory failure being repeated, did I already say that?


Also - blame ? Yesterday 11:57 pm
Dave H and mimdec80 have rated 2 posts (details)

mimdec80 rated the post first

Zitat von Dave H im Beitrag #69

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Bored, alcohol and bored, I think I already said that/this

Dejavue is just a memory failure being repeated, did I already say that?


Also - blame ? Yesterday 11:57 pm
Dave H and mimdec80 have rated 2 posts (details)

mimdec80 rated the post first

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Try your best to be honest.

I've tried that but 'honesty' is only useful to tell a good truth, telling someone a negative truth is rarely a good thing.

Ttry a few of these :-

" You do not have big bones, you're just a fat person"

" Electric bikes make so much sense I think it would be perfect for a 3,000 mile trip across europe"

" Tyre manufacturers and tester have better knowledge than you/I do, maybe their advice is better? "

" With the greatest of respect ...." (my favorite ?) I think this one will replace drunk replies.

Zitat von Dave H im Beitrag #71

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Try your best to be honest.

I've tried that but 'honesty' is only useful to tell a good truth, telling someone a negative truth is rarely a good thing.
...

" With the greatest of respect ...." (my favorite ?) I think this one will replace drunk replies.

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I did find a website called American sport touring, Where they recommend the standard tire pressure in the manual. But they mention a method to check if this could be actually right. It's called the 10/20 rule. After you set the tire pressure to the recommended level and ride for at least a half hour and pull over and check the pressure hot. According to them to tire pressure should up 10% in the front and 20% on the rear tire.
At the normal 36/42 setting that would be 39.6 front 46.2 rear hot. They go on to suggest adjustment by waiting until the next ride with the tires cold and if the tire didn't reach the 10% on the front or 20% on the rear on the last ride to lower pressure to heat up tires more increasing the hot temp reading until it reaches the said percentages or the correct hot pressure .... I'm not recommending this at all and if one did the adjustment it should be very small imo .... That being said it certainly does sound interesting to check this but not necessarily make actual adjustments. It would be good to know what the manufacture considers the right amount of increase in the hot tire pressure reading for specific tire compounds and models before any adjustments .... It would also be interesting to see how much difference between winter and summer riding.

The 10% rule was around years ago for bias ply tires.
Didn't know if it still applied to radials.

good point Lee ..... But I'm sure any tire has a projected hot pressure, if you can get the info. I'm pretty sure this is also similar to how motogp works with tire pressure.. As you heard motogp started checking pressures on the starting line as it was thought the teams were lowering pressure too much to account for excess heat. Hickman received a penalty for too low of pressure but it was only tenths of a pound but cost him a lot.
But I do plan to check the hot temps just to see what the tires are doing, over the course of seasons .... the pressure might not matter a lot with the auto suspension ...