You with tire monitors - how high is too high? - BMW Luxury Touring Community
 
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post #1 of 14 Old Aug 17th, 2009, 10:33 am Thread Starter
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You with tire monitors - how high is too high?

So I installed a Tyredog pressure monitor system (discussed in another recent thread) on my LT with Metzlers, and it shows me how my pressure is changing as I ride. I start out with cold psi of 40fr/48rear, as is most often recommended here, and I have the Tyredog's high pressure warning set to come on at 10psi above those levels.

The pressure seems to generally rise to 5-7psi above those levels with normal riding, but on a warm day with a little curve carving, I can easily get it above the warning level (i.e., 50fr and/or 58rear).

My question is this: how high is 'too" high? Should I set the hi warning at 15psi above normal cold psi? 20psi above? Should I not even worry about how high the pressure is getting? If riding on a hot day and/or planning to be riding hard in twisties, should I start out with lower-than-standard pressures?

I never worried about these things when I didn't KNOW what the pressure was while riding!

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post #2 of 14 Old Aug 17th, 2009, 10:46 am
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Re: You with tire monitors - how high is too high?

Something in the 10 - 15 psi range seems right. And yes, sometimes adding technology just gives you more stuff to worry about. That's why I prefer to be blissfully ignorant!

David Taylor
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post #3 of 14 Old Aug 17th, 2009, 11:19 am
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Re: You with tire monitors - how high is too high?

With my TyreDog unit, I observed how high the pressure got on a warm day, and then set the upper limit to just about it. There are many factors that affect tire pressure - heat, altitude. I found this info: for every 1000 feet gained in altitude tire pressure goes up 1/2 lb. So if you ride up 10,000 feet and it gets 50 degrees warmer since you last checked it that's 10 psi more pressure.

I use the TyreDog monitor to make sure the tires don't get too low in pressure.

Jim G - Rochester, MN
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post #4 of 14 Old Aug 17th, 2009, 11:28 am Thread Starter
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Re: You with tire monitors - how high is too high?

Quote:
Originally Posted by jaskjb
...I use the TyreDog monitor to make sure the tires don't get too low in pressure.
Exactly! That's why I got it, too -- and it looks like it will do a great job of that!

I just started thinking I should set its high pressure warning ridiculously high (e.g., 20-30psi above normal) so it NEVER gets triggered (and I never have to think about it again), or if there is actually a high point at which I should get worried...and/or do something, like let some air out to reduce the pressure.

My understanding of tires and their capabilities is FAR less than many of the other folks here, so I thought I'd use it as an opportunity to learn something!

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post #5 of 14 Old Aug 17th, 2009, 2:55 pm
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Re: You with tire monitors - how high is too high?

Where did you get it? How much? Thanks,

Quote:
Originally Posted by Bruce_Yates
So I installed a Tyredog pressure monitor system (discussed in another recent thread) on my LT with Metzlers, and it shows me how my pressure is changing as I ride. I start out with cold psi of 40fr/48rear, as is most often recommended here, and I have the Tyredog's high pressure warning set to come on at 10psi above those levels.

The pressure seems to generally rise to 5-7psi above those levels with normal riding, but on a warm day with a little curve carving, I can easily get it above the warning level (i.e., 50fr and/or 58rear).

My question is this: how high is 'too" high? Should I set the hi warning at 15psi above normal cold psi? 20psi above? Should I not even worry about how high the pressure is getting? If riding on a hot day and/or planning to be riding hard in twisties, should I start out with lower-than-standard pressures?

I never worried about these things when I didn't KNOW what the pressure was while riding!

Matt Kas

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Laguna Niguel, Southern California (South Orange County)
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post #6 of 14 Old Aug 17th, 2009, 3:54 pm
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Re: You with tire monitors - how high is too high?

IIRC my smartire never showed more than 58 PSI and 165 degrees out in the desert with a 48 starting pressure. But that was last year and I have slept a few times since then.

That's why I like that system since it give an absolute and a delta on pressure (from cold corrected for temp). I could have 49 PSI but be three Lbs low at 130 degrees. Too bad they don't sell it any more. They can be had on eBay from time to time as I just got one for the GS.

John
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post #7 of 14 Old Aug 17th, 2009, 5:14 pm Thread Starter
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Re: You with tire monitors - how high is too high?

Quote:
Originally Posted by MattKas
Where did you get it? How much? Thanks,
Here's the thread where it is discussed, with link to places you can buy one just like it (but cheaper): http://www.bmwlt.com/forums/showthread.php?t=48526

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2004 CCR - Breckenridge, CO
2005 CCR - Jackson Hole, WY
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2009 CCR - Rapid City, SD
2011 CCR - Boise, ID

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post #8 of 14 Old Aug 17th, 2009, 11:35 pm
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Re: You with tire monitors - how high is too high?

Quote:
Originally Posted by Bruce_Yates
I never worried about these things when I didn't KNOW what the pressure was while riding!
It is true that we can give ourselves something more to worry about but I had an experience once where I was driving down into west Texas after dark (something I normally would never do--but I didn't plan well) when I pulled into town at 10:30pm dogtired...I stopped at the signal light and went to make a left turn to my hotel and my front tire was almost flat ...I had no clue; it scared my wife so much--she scared me! I could of used a little technical assistance that night. Can you guess what my next farkle will be?

Wade
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post #9 of 14 Old Aug 20th, 2009, 11:12 am
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Re: You with tire monitors - how high is too high?

Tires have a burst ratio of 3-4x the max cold recommended pressure. 10-15psi is not even close to causing a problem. Keep in mind when a tire is installed, it may be inflated to near 100psi to seat the bead. Yes, the engineers know the pressure will increase as the tire heats. That is included in determining the maximum cold inflation pressure.
Only in specific operating conditions should pressure be bled off when tires heat up (mostly racing applications where a specific tire response is desired).

Just ride it!

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post #10 of 14 Old Aug 20th, 2009, 11:24 am
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Re: You with tire monitors - how high is too high?

This may be a slight detour but is not a total hijack of the original post. I have an AccuGauge which reads about 4-5 pounds higher than my factory TPM. Which is likely the more accurate?

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post #11 of 14 Old Aug 20th, 2009, 11:31 am
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Re: You with tire monitors - how high is too high?

If you can find two that agree you will then know (or have a better idea). I pitched several of my old pencil styles when I found two guages that agreed. I pitched everything that didn't agree.Still may not be correct but I happy.

John
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post #12 of 14 Old Aug 20th, 2009, 2:29 pm
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Re: You with tire monitors - how high is too high?

As a few others have said, I'm more concerned with under than over inflation. I've got the Smartire installed and have been surprised at how high the tire temperature can get, but not overly concerned. I've had two situations before the Smartire where I lost air and was not aware of it until the bike did not preform as it should. Once the front end acted as if it had a low speed wobble ( back tire low) and the other I lost a rubber inflater valve. Bother took too long to discover and the Smartire would have probably alerted me in time to correct the problem.

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post #13 of 14 Old Aug 20th, 2009, 4:28 pm
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Re: You with tire monitors - how high is too high?

I ride with my tires at 42F / 48R.
As I mentioned earlier - I am more concerned about Low pressure. I set the Low alarm at the recommended pressure by BMW. Then If I loose pressure for whatever reason, I won't get too low to cause damage to the tire or an unsafe situation.
Here is where I bought my Tyre Dog: http://autodax.com/catalog/pdetail.php?prdid=208
Here is the tire guage (Accutire) I use to monitor pressure when manually checked: http://www.amazon.com/Accutire-MS-47.../dp/B000YQQZCW

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post #14 of 14 Old Aug 20th, 2009, 5:11 pm
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Re: You with tire monitors - how high is too high?

Your numbers are what I have seen om my Doran for that last year or so.

I have seen 57-59 PSI on the rear from 48, and 47-49 on the front from 42.

I set for 4 pounds low on my alarms.

Lee
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