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  #1  
Old 07-10-2017, 09:25 PM
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Tire change TPMS off

I changed my tires the other day and now the tire pressure indicators are way off. I made absolutely sure that I didn't damage the sensors during the change. I have 36/42 in the tires and the indicator reads 32/37. Is there a way to reset the sensors? What's going on?
PS before the tire change the indicators were within 1 psi of my hand gauge, now they're reading 4 to 5 psi low.
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Old 07-11-2017, 06:11 AM
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Re: Tire change TPMS off

There have been discussions on this forum about the functioning of the TPMS. It is important to know that the system corrects the tire pressure to a calculated pressure at 20 degrees Celsius / 68 Fahrenheit.
So whether the TPMS agrees with a handheld gauge or not, depends on the ambient temperature. (And of course on the accuracy of the handheld.)

Not to offend you or suggesting you are dead wrong, but it is not likely that your handheld gauge always agreed with the TPMS values before you changed the tires.
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Old 07-11-2017, 08:11 AM
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Re: Tire change TPMS off

My Longacre digital pressure gauge (accurate to 0.1 psi) never agrees with the cycles readings. There is a procedure outlined to make the TPMS read what the book says it should.

1. Ride the cycle just enough to get a reading on the TPMS. You don't want the tires to develop any heat.

2. Note the over / under of the TPMS display as compared to the desired value and note that value.

3. Measure the actual tire pressure using an accurate gauge and note those readings.

4. Add or subtract the over / under in the TPMS in step two to the pressure gauge reading and note that computed pressure.

5. Add or release air to the tire until the pressure display on your gauge matches the one you computed in step 4 above.

Now the TPMS will read the desired temperature compensated pressure in the manual assuming the current tire temperature is what BMW expects from mother nature.

OR, you can inflate the tires so they perform as you want them to and use the TPMS as an early warning of an impending flat tire.
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Old 07-11-2017, 09:21 AM
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Re: Tire change TPMS off

Quote:
Originally Posted by henkpenk
Not to offend you or suggesting you are dead wrong, but it is not likely that your handheld gauge always agreed with the TPMS values before you changed the tires.
Not offended at all. I don't expect there to be agreement between my hand gauge's and the tpms. Just wondering why the tpms readings are now 4 to 5 psi different than the hand held when the tpms readings were relatively close to the hand gauge before tire change.
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Old 07-11-2017, 09:33 AM
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Re: Tire change TPMS off

Quote:
Originally Posted by WPV
My Longacre digital pressure gauge (accurate to 0.1 psi) never agrees with the cycles readings. There is a procedure outlined to make the TPMS read what the book says it should.

1. Ride the cycle just enough to get a reading on the TPMS. You don't want the tires to develop any heat.

2. Note the over / under of the TPMS display as compared to the desired value and note that value.

3. Measure the actual tire pressure using an accurate gauge and note those readings.

4. Add or subtract the over / under in the TPMS in step two to the pressure gauge reading and note that computed pressure.

5. Add or release air to the tire until the pressure display on your gauge matches the one you computed in step 4 above.

Now the TPMS will read the desired temperature compensated pressure in the manual assuming the current tire temperature is what BMW expects from mother nature.

OR, you can inflate the tires so they perform as you want them to and use the TPMS as an early warning of an impending flat tire.

Thanks. I'll try that. I think you're right in that the primary purpose of the tpms is as a warning when a tire loses air quickly.
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Old 07-14-2017, 09:14 AM
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Re: Tire change TPMS off

Ok. Now that I've riden the bike for several hundred miles, checking the presume repeatedly, I know that the tpms reads 2 to 3 psi less than the actual pressure in the tires. I'll still use the hand gauge to set the pressure and rely on the tpms for only a catastrophic loss of air.
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Old 07-15-2017, 05:36 AM
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Re: Tire change TPMS off

Is there a battery on these sensors or are they mechanical? Mine is +-1lb on both wheels but my bike is only 5 months old on my ownership.
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Old 07-15-2017, 09:41 AM
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Re: Tire change TPMS off

They operate with a battery. Assuming that your hand gauge is accurate, which it is not because none are, being off by only 1 psi is nothing. BMW says that if it's within 10% it's within spec. So the difference could be easily 3 or 4 psi.
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Old 07-15-2017, 11:01 AM
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Re: Tire change TPMS off

Quote:
Originally Posted by bobby
They operate with a battery. Assuming that your hand gauge is accurate, which it is not because none are, being off by only 1 psi is nothing. BMW says that if it's within 10% it's within spec. So the difference could be easily 3 or 4 psi.
I wasn't complaining about mine being off so slightly, I think plus/minus 1 is great. I was just wondering aloud if a weaker battery would tend to make the sensors less accurate as the OP is experiencing.
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Old 07-15-2017, 07:17 PM
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Re: Tire change TPMS off

My 12 RT is the first bike I have owned that has the TPMS. When I first bought it the displayed pressures matched very close with all three of my gauges. After a while and a few top offs with air they changed to reading lower than my gauges. Then they read a bit higher. Some times 3 - 4 psi. I think I will try the above procedure at as close to 68 degrees in the morning. I too use them for reference for a pending flat. I almost never top off tire pressure when tire is hot. I remember reading somewhere that people who do not have an air compressor can top off tires at a filling station a few pounds high and ride it home carefully. Then next morning bleed off air needed to bring them down to proper pressure.
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