RE: Could we discuss TPM theory (according to BMW)? - 2

Zitat von azqkr im Beitrag #15

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I correct tire pressure to ambient temp cold pressures based on the 68F at 68 [ I call it even at 70F ]. So when heading out for the day in August when the garage is 90, I set to 38/44. When the garage is 50 in Dec. I set them to 34/40.

The tpms shows within 1-2 degrees from what I put in the tires. Like Lee, if I'm on a trip, I check the tpms reading, if they are the same as the day before or off by 1-2 psi, I don't concern myself further

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Zitat von Becksy im Beitrag #2

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Tyre gauge only for me. View TPM as a warning system only.

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Zitat von Lee im Beitrag #12

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Zitat von Dave H im Beitrag #10

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Safety net of Orange or Red warnings working in the background.

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No matter how you check the air pressure, the warning triangles are a great safety feature.
It's also a nice convenience if it's a slow leak. If it's a slow leak it let you know if you can get to a good spot to plug the tire.

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Just for drill, I decided the other day to apply BMW's TPM formula. My garage was 48 degrees F in the morning (day's forecast called for warmer temps later). Anyway, using the 42/36 psi inflation "recommendations", and adjusting for the 20 degrees F difference between the TPM's reference number of 68 degrees F and the garage temp of 48 F, I set (with an AccuGauge) my tires to 40/34 psi.

Lo and behold, when I went riding later, the TPM showed 42/36 psi. So, it works...

On another subject, my bike came with Metzeler Roadtec 01 tires. I've never really had a bike go seriously "squirrely" on me before when transitioning over tar snakes, but for some reason these tires really dislike tar snakes. Why would that be? My RR had Metzeler M9 RR tires and while I might note a little wiggle over a tar snake...it was nothing like the Roadtec 01's. Thoughts? Perhaps the harder compound on the Roadtec tires?

Thanks.

Was out and about today, squeezing in a decent ride out in between all the rain and howling wind that seems to be standard for the spring so far, and got a warning that my tyre pressure was on the limit of what is acceptable. The system was telling me I had 74psi in the front tyre!

Zitat von Becksy im Beitrag #20

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Was out and about today, squeezing in a decent ride out in between all the rain and howling wind that seems to be standard for the spring so far, and got a warning that my tyre pressure was on the limit of what is acceptable. The system was telling me I had 74psi in the front tyre!

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36 by tyre gauge.

Zitat von Becksy im Beitrag #22

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36 by tyre gauge.

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Zitat von Becksy im Beitrag #20

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Was out and about today, squeezing in a decent ride out in between all the rain and howling wind that seems to be standard for the spring so far, and got a warning that my tyre pressure was on the limit of what is acceptable. The system was telling me I had 74psi in the front tyre!

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Any idea of average TPM battery life?

By the way, the BMW calculations for setting pressure to read appropriately when using the 68 degree "standard" ambient temperature really does work. It was 53 degrees in my garage late yesterday (1.5 degrees below 68), and I wanted a riding pressure of 41/35. Using my gauge, I set pressures to 39.5/33.5. Went riding today and the TPM read exactly 41/35. It's a bit of extra work, but using this method yields a consistently repeatable pressure, regardless of what the outside temperature does. It sounds OCD at first, but by using it I don't feel as though I'll wind up over- or under-inflated, no matter what the day holds, temperature-wise.

Zitat von BEARR im Beitrag #25

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Any idea of average TPM battery life?

By the way, the BMW calculations for setting pressure to read appropriately when using the 68 degree "standard" ambient temperature really does work. It was 53 degrees in my garage late yesterday (1.5 degrees below 68), and I wanted a riding pressure of 41/35. Using my gauge, I set pressures to 39.5/33.5. Went riding today and the TPM read exactly 41/35. It's a bit of extra work, but using this method yields a consistently repeatable pressure, regardless of what the outside temperature does. It sounds OCD at first, but by using it I don't feel as though I'll wind up over- or under-inflated, no matter what the day holds, temperature-wise.

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Zitat von BEARR im Beitrag #25

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Any idea of average TPM battery life?

By the way, the BMW calculations for setting pressure to read appropriately when using the 68 degree "standard" ambient temperature really does work. It was 53 degrees in my garage late yesterday (1.5 degrees below 68), and I wanted a riding pressure of 41/35. Using my gauge, I set pressures to 39.5/33.5. Went riding today and the TPM read exactly 41/35. It's a bit of extra work, but using this method yields a consistently repeatable pressure, regardless of what the outside temperature does. It sounds OCD at first, but by using it I don't feel as though I'll wind up over- or under-inflated, no matter what the day holds, temperature-wise.

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Zitat von BEARR im Beitrag #23

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Zitat von Becksy im Beitrag #22

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36 by tyre gauge.

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Be interested in hearing how that plays out. Or did it revert to normal on its own?

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Zitat von Becksy im Beitrag #28

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Zitat von BEARR im Beitrag #23

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Zitat von Becksy im Beitrag #22

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36 by tyre gauge.

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Be interested in hearing how that plays out. Or did it revert to normal on its own?

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No, that's the reading by separate tyre pressure gauge, not the bike.
Will have to get it booked into local dealer to have it looked at under warranty.

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Zitat von azqkr im Beitrag #15

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I correct tire pressure to ambient temp cold pressures based on the 68F at 68 [ I call it even at 70F ]. So when heading out for the day in August when the garage is 90, I set to 38/44. When the garage is 50 in Dec. I set them to 34/40.

The tpms shows within 1-2 degrees from what I put in the tires. Like Lee, if I'm on a trip, I check the tpms reading, if they are the same as the day before or off by 1-2 psi, I don't concern myself further

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