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Discussion Starter · #1 ·
I noticed the last two rides, the TPMS says the tires are low when I start my bike before a ride, measuring at 30/35.. but after I drive for a little while and the tires warm up, the TPMS goes to 36/41 where it should be.

I'm guessing that the dealership filled them warm to the recommended pressure, but not cold pressure. I guess my question is, what are you seeing while you've been riding for a bit.

That 36/41 is probably going to be higher on the display after riding for 15 minutes.
 

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Your tire pressure can vary from day to day due to temperature. Tires should be aired up when cold, not after a ride. Fill front/rear to 36/41 and check every week or two...you’ll be fine.
 

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I noticed the last two rides, the TPMS says the tires are low when I start my bike before a ride, measuring at 30/35.. but after I drive for a little while and the tires warm up, the TPMS goes to 36/41 where it should be.

I'm guessing that the dealership filled them warm to the recommended pressure, but not cold pressure. I guess my question is, what are you seeing while you've been riding for a bit.

That 36/41 is probably going to be higher on the display after riding for 15 minutes.
Is physics taught in Canadian schools ?
 

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Don't forget the outside temperature at the time you set the pressure. Here it could be 40 one day then 80 the next. That will drive your pressure like a roller coaster. No different then when the temps drop rapidly in the winter and everyone's car has a low tire light on the dash.
 

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Your tire pressure will always go up after you ride awhile. Your tires heat up and the TPMS will reflect that. Just fill them to the recommendations while they are cold and all is well.
 

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must be something new... my TPMS doesn't register until I'm moving and then each wheel takes a different time to read out
Mine has always worked that way on both my Challenger and the Springfield Dark Horse. BTW, I always run 38/42 cold in my Indian's. Low tire pressures = less tire mileage. And if the temp drops nothing worse than that low tire pressure light going off.its a lot easier to let pressure out than put it in when you are on a trip. Especially the rear tire.Indian couldn't have found a more difficult valve stem to access for the rear wheel.
 

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Run with nitrogen. You will reduce your 6psi swings in half and can get it <2 if you do a decent job purging the air out of your tires before the final fill.
 

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Discussion Starter · #13 ·
Is physics taught in Canadian schools ?
It is.. my question was what the TPMS was displaying with 36/41 cold pressure after the tires have warmed up. I'm well aware of expansion as they warm.
 

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Run with nitrogen. You will reduce your 6psi swings in half and can get it <2 if you do a decent job purging the air out of your tires before the final fill.
Obviously you do not understand that PV=nRT regardless of what the gas or gas mixture is. That's why it's called the UNIVERSAL Gas Law.
 

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Obviously you do not understand that PV=nRT regardless of what the gas or gas mixture is. That's why it's called the UNIVERSAL Gas Law.
Totally!! Do you?? Once you figure out what your compressor is spitting into your tire, reply back ! Hint, Nitrogen doesn't have it !
 

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I noticed the last two rides, the TPMS says the tires are low when I start my bike before a ride, measuring at 30/35.. but after I drive for a little while and the tires warm up, the TPMS goes to 36/41 where it should be.

I'm guessing that the dealership filled them warm to the recommended pressure, but not cold pressure. I guess my question is, what are you seeing while you've been riding for a bit.

That 36/41 is probably going to be higher on the display after riding for 15 minutes.
My Chieftain Limited does the same thing I go by the reading after running and it changes with the temperature too.
 

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2019 Scout and Chieftain Classic both in Willow Green and Cream
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I noticed the last two rides, the TPMS says the tires are low when I start my bike before a ride, measuring at 30/35.. but after I drive for a little while and the tires warm up, the TPMS goes to 36/41 where it should be.

I'm guessing that the dealership filled them warm to the recommended pressure, but not cold pressure. I guess my question is, what are you seeing while you've been riding for a bit.

That 36/41 is probably going to be higher on the display after riding for 15 minutes.
Have you used a real pressure gage to verify, TPMS systems are not as accurate as a gage, I use a digital.
 

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Discussion Starter · #19 ·
I went to put in air into my back tire. You pretty much have to take the right saddle bag off since the valve points out the right.. and the drive belt wheel gets in the way. Crazy design.
 

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1lb psi change per 10 deg change in ambient temp just sitting in the drive way.
 
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