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Iron Butt
Posts: 741
Central New York | OK, I broke down and put a monitoring system on my Vision. Mostly because I don't like crawling around on the ground like a worm trying to check the pressure. Getting down ain't so bad, it's the getting back up. Anyway, I like to run 41 PSI front and back. According to the monitor, that is what I have. My issue is that today after driving just 8 miles the front went to 61 PSI and the rear went to 57 PSI. Front temp said 86F, Rear 79F. Both were 71F before starting. My question is, for those with a monitor, what do your pressures climb to? And what do you have your high side warning set at?
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Visionary
Posts: 4278
| I crawl on the ground and run 41 in each. When I check my air its when tires are cold. With my gauge after a long ride they do grow another 8 pounds.
So if you check your tires when there cold and you set them at 38 and with the riding or the day the tire pressure climb's to 40 isn't that where you want it? |
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Cruiser
Posts: 92
Fort Walton Beach, FL | john frey - 2011-06-17 4:40 PM
I crawl on the ground and run 41 in each. When I check my air its when tires are cold. With my gauge after a long ride they do grow another 8 pounds.
So if you check your tires when there cold and you set them at 38 and with the riding or the day the tire pressure climb's to 40 isn't that where you want it?
When the manufacturer of a tire recommends an inflation tire psi... it is a "cold" psi... they know that the tire will heat up and that the tire pressure will rise accordingly. Their recommended psi is not a future psi level after 3 minutes of riding time or 30 minutes of riding time... it's an absolute "right now COLD" psi. |
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Iron Butt
Posts: 741
Central New York | I understand. I get the "cold" pressure. Always check my tires cold, set to 41PSI.
My question was directed to those that have a tire monitoring system because I was surprised by the 15 lb pressure increase. Have never checked a "warm" tire, a 15 lb increase to 56PSI seemed excessive for only driving about 8 miles. I was also asking what they set their "high" warning at. |
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Cruiser
Posts: 92
Fort Walton Beach, FL | Sorry I misunderstood... since I have never used a monitoring device for tire pressure, I have no idea what variables enter into accurate readings at temperature. My guess is that these devices are as accurate as any tire pressure gauge at cold psi's... and then tend to wander from there. I have a whole collection of pressure gauges in the garage and each one gives me a different psi reading depending on the alignment of the galaxy on any given day. I tend to be content just being close to target on tire pressure. |
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Visionary
Posts: 1290
Ruskin, Fl | I try to run 40 front and back. I have the wireless pressure monitor. If I start with 40 psi cold in the rear, it will go up to about 44-45 after riding for a bit. A little higher riding two up. I over filled my front and didn't correct it yet. 45 cold goes up to 51 when the tire is warmed up. I believe that that big a pressure jump cannot be accurate. Have you tried checking the pressure with a gauge after a ride? |
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Cruiser
Posts: 91
| Back last fall I bought a TPM on sale from a auto supply for 50% off. It was a piece of junk. One sensor was reading about 20 PSI higher even when I moved the sensor to the other tire. The one sensor was still reading 40psi when I took it back to the store the next day! It was made in China.
http://www.princessauto.com/trailer/truck/truck-accessories/electro... |
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Visionary
Posts: 1229
Rancho Cucamonga, CA | My Doran is set to 41 front and back. My tires on a cold morning (50f) my tires will sometimes set off the low pressure warning (36psi), then be fine after a mile or so. I never worried about the high end, that is more a racers concern and I'm not going to stop and adjust once the tires are up to temp. One of the IBA issues had a big article on TPMS with temp charts and all. I will try and find it. |
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Iron Butt
Posts: 619
Southeast Iowa | My question is, for those with a monitor, what do your pressures climb to? And what do you have your high side warning set at?
I set my rear at 40 PSI and it climbs about 5-12 PSI depending on temps and riding style. I rarely ride 2 up but I weigh 295 lbs.
I set my front at 38 PSI and it climbs about 2-8 PSI. My front never increases as much as the back and does not get significantly warmer than ambient. My rear does get quite a bit warmer but I can't tell you how much. I rarely look at the temps and just plain don't remember. I think I set my rear 15 PSI over and my front 10 PSI over.
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Iron Butt
Posts: 741
Central New York | Big Vic - 2011-06-19 8:01 AM My question is, for those with a monitor, what do your pressures climb to? And what do you have your high side warning set at? I set my rear at 40 PSI and it climbs about 5-12 PSI depending on temps and riding style. I rarely ride 2 up but I weigh 295 lbs. I set my front at 38 PSI and it climbs about 2-8 PSI. My front never increases as much as the back and does not get significantly warmer than ambient. My rear does get quite a bit warmer but I can't tell you how much. I rarely look at the temps and just plain don't remember. I think I set my rear 15 PSI over and my front 10 PSI over. Thanks! That's what I was looking for. After do a couple more rides I am starting to see numbers that reflect about the same as you are showing. The first time out the new sensors weren't in the game yet. The next day I reset everything and seems good. I do like having the system, I think it is very helpful, especially when the bike does something odd feeling and you wonder in the back of your head if something is up with a tire. Now I can just glance at the monitor instead of pulling over and kicking the tires. 
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Puddle Jumper
Posts: 7
| fill your tires with nitrogen |
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Cruiser
Posts: 132
Durango, Colorado | big daddy - 2011-09-29 10:44 AM fill your tires with nitrogen Compressed "Air" is comprised of 78.08% nitrogen with the remainder primarily oxygen. The oxygen molecule being smaller than nitrogen allows it to permiate the molecular structure of vulcanized rubber resulting in the loss of air pressure. After time and numerous refillings of the tire with "Air" the nitrogen concentration increases to a point where there is so little oxygen remaining in the mix that tire pressure stabilizes. I have seen this in stored tires like on collector cars or even old spares where the tire life is long due to little use. Your tires are, by default, nitrogen concentrators and little is to be gained by using "pure" nitrogen (doubt that's what it really is) to fill your tires. But, as always, to each his own! paulhu "aka" blah blah blah..........cheers |
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Visionary
Posts: 1229
Rancho Cucamonga, CA | paulhu - 2011-09-29 11:00 AM
big daddy - 2011-09-29 10:44 AM fill your tires with nitrogen ?? Compressed "Air" is comprised of 78.08% nitrogen with the remainder primarily oxygen. The oxygen molecule being smaller than nitrogen allows it to permiate the molecular structure of vulcanized rubber resulting in the loss of air pressure. After time and numerous refillings of the tire with "Air" the nitrogen concentration increases to a point where there is so little oxygen remaining in the mix that tire pressure stabilizes. I have seen this in stored tires like on collector cars or even old spares where the tire life is long due to little use. Your tires are, by default, nitrogen concentrators and little is to be gained by using "pure" nitrogen (doubt that's what it really is) to fill your tires. But, as always, to each his own! ???????? paulhu "aka" blah blah blah..........cheers
THANKYOU!!
I have been trying to tell people what a scam paying for nitrogen(N2) is for a long time, but nobody listens. I figure by the 3rd time you top off your tires with air, you are at about %99 N2 anyway. |
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Tourer
Posts: 337
san antonio, tx | paulhu - 2011-09-29 1:00 PM
big daddy - 2011-09-29 10:44 AM fill your tires with nitrogen ?? Compressed "Air" is comprised of 78.08% nitrogen with the remainder primarily oxygen. The oxygen molecule being smaller than nitrogen allows it to permiate the molecular structure of vulcanized rubber resulting in the loss of air pressure. After time and numerous refillings of the tire with "Air" the nitrogen concentration increases to a point where there is so little oxygen remaining in the mix that tire pressure stabilizes. I have seen this in stored tires like on collector cars or even old spares where the tire life is long due to little use. Your tires are, by default, nitrogen concentrators and little is to be gained by using "pure" nitrogen (doubt that's what it really is) to fill your tires. But, as always, to each his own! ???????? paulhu "aka" blah blah blah..........cheers
Hmmm, never thought about that before but I guess it makes sense. |
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Cruiser
Posts: 132
Durango, Colorado | Of course, if you pick up a nail or have a bad valve stem or somthing all bets are off. I fill my tires to 55-60 psi in the winter storage months to exaggerate the effect, checking and re-filling periodically and usually after one winter on a new set of skins the pressure is stabilized. then simply set to desired pressure and RIDE BABY RIDE! paulhu |
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Cruiser
Posts: 68
LONDONDERRY NH | When it comes to inflating automobile tires, it?s
our position that ordinary, dry compressed
air?which is about 80 percent nitrogen
already?is the best choice. That?s because it?s
more readily available, and the benefits of using
nitrogen simply don?t appear to outweigh those of
using compressed air.
The practice of inflating tires with nitrogen really
isn?t anything new; it?s been around a long time.
It?s been commonly used on aerospace vehicles,
commercial and military aircraft, military vehicles,
race cars, and even heavy off-road construction
equipment. Here?s why:
? To meet rigid safety and performance specs,
the required tire inflation pressures are often
very high, especially in the aerospace industry.
The tire inflation pressure for NASA?s space
shuttle, for instance, is a whopping 315 psi!
? Nitrogen is an inert gas; it doesn?t combust or
oxidize.
? The process used to compress nitrogen
excludes water vapor. Water vapor can expand
if the temperature climbs above 212?F.
? Tires inflated with nitrogen leak slower over
time than those inflated with compressed air.
Automobile tires, on the other hand, are subjected
to an entirely different set of conditions. Here?s
why inflating tires with nitrogen offers no real
advantages:
? Although tires inflated with nitrogen leak
slower over time than those inflated with
compressed air, they still leak and need to be
reinflated to maintain proper pressure. If you
can?t find a place that offers nitrogen
inflation?and there aren?t yet all that many
places that do?your only option left is to
reinflate with compressed air. Doing that
drops the nitrogen purity.
? Nitrogen offers no better protection against
road hazards such as cuts and punctures. So
no matter what you inflate the tire with, you
still need to check the condition and pressure
of the tires at least once a month as
recommended in the O/M.
? Tires that are inflated with compressed air and
properly maintained offer the same fuel
economy, tread wear, and ride comfort as
those inflated with nitrogen.
? Nitrogen for automobile tires is produced by
nitrogen generators, which typically get about
95 percent purity. But to actually get that
level of purity into an automobile tire, you
would have to deflate and inflate that tire with
nitrogen several times. If you?re not careful
doing this repeated deflation and inflation
process, the purity level winds up being closer
to 90 percent (compared to the approximate
80 percent nitrogen already in compressed
air). Because of this, those claims of less
pressure loss with nitrogen aren?t valid.
So here?s the bottom line: Nitrogen is an ideal gas
for inflating tires in aircraft, military vehicles, race
cars, and heavy off-road equipment, but when it
comes to automobile tires, it offers no apparent
advantages over ordinary, dry compressed air.
Our advice to you: Just stick with the air you
breathe.
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Iron Butt
Posts: 1117
Northeast Ohio | Gary, I run the TireGard system, and have been for almost 3 yrs now. I run 40 in the front and 42 in the rear. I always see my pressures and tempuratures climb, but more so in the rear than the front. I have seen my rear tire get up to 110 degrees and pressures as high as 56 in the rear and 52 in the front. I have never seen my front tire pressure or tempurature higher than my rear.
What is the make of your TPMS? |
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Iron Butt
Posts: 741
Central New York | Actually, mine has no name on it, so I can't tell you. It is a key fob type. It works very well, I have had no issues with it once I figured it out. I run 41/41. On an 80 degree day, after about 10 miles is stabilizes at 45.5/46.5.
Oh, and no nitrogen. 100% American air! |
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Iron Butt
Posts: 1117
Northeast Ohio | If it looks like this, it is TireGard 
Edited by ScoreBo 2011-09-29 8:45 PM
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Iron Butt
Posts: 741
Central New York | Yeah, that's the guy. |
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Iron Butt
Posts: 880
Orlando, FL | Hi glight, I too have the Tireguard TMPS and have both tires at 40 PSI. I have my low alarms set about 32-33 but I've got the high alarms cranked very high. I have see my pressures climb as I ride but never really pay attention as long as they are higher than cold tires. Without the TPMS no one would give a crap about warm tire pressures, so why all the fuss now? I'm guessing my tires PSI increases 308 PSI when hot. And linving in FL my tires get as hot as 113 easy in the summer.
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Cruiser
Posts: 52
San Jose, CA | Stock Tires 38F, 40R. On my way to vegas in 100+ weather with rear needing replacement rear went all the way to 50. So an increase of 10 in hot weather, high speed (80), for 12 hours and I would say that was normal.
I put Cobras on in Vegas and now run 42, 44R. neither got near 50, hung in the 48s. |
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Tire Pressure Monitor