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Offline Ernest T

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TPMS
« on: October 08, 2013, 02:18:37 pm »
How accurate is the TMPS supposed to be?  When the tires are inflated to the correct cold pressure the TMPS says they are 4-5 lbs higher.  I check with three different gauges and all read within a pound of each other.

Offline john348

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Re: TPMS
« Reply #1 on: October 08, 2013, 04:41:28 pm »
I foudn the same perhasp only a couple of pounds higher.  It also seemed a bit strange that after inflating the tyres a bit the TPMS system took a few miles before it read the right pressure?  Nothing beats checking with a proper guage and I use the TPMS to watch for changes rather than actual.

Offline Tigercat

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Re: TPMS
« Reply #2 on: October 08, 2013, 05:36:56 pm »
Found the same results, even bought a third quality gage to make sure, 36 psi cold on the front is 41 indicated TPMS. Rear reads high the same.  False security to rely on TPMS readings me thinks.  :017:

Offline enGage

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Re: TPMS
« Reply #3 on: October 08, 2013, 06:15:05 pm »
Mine are dead-on when cold.  I inflated the tires to the factory spec 36/42 and that's the reading I got pulling out of my driveway.  Keep in mind that the tires will heat up fast so that initial reading doesn't last long.

Offline Ernest T

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Re: TPMS
« Reply #4 on: October 08, 2013, 07:50:21 pm »
It takes about 50 yards or so before the TPMS shows any numbers and then its usually 40/45 or so when the tires are inflated to specs.

Offline venomyellow

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Re: TPMS
« Reply #5 on: October 08, 2013, 08:04:04 pm »
*Originally Posted by enGage [+]
Mine are dead-on when cold.  I inflated the tires to the factory spec 36/42 and that's the reading I got pulling out of my driveway.  Keep in mind that the tires will heat up fast so that initial reading doesn't last long.

Same for me - TPMS matches my digital gauge exactly

Offline chrisb1

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Re: TPMS
« Reply #6 on: October 08, 2013, 08:22:56 pm »
mine are bob on....i can even tell when i have been a little spirited, am 2 up, or its hot by the increase in pressure (and suspect i am not far from seeing a decrease as it gets frosty).  I am sure you could calculate this but the additional force downwards adding people or luggage will increase the tyre pressure as well - equal and opposite forces & all that...not done the calcs but suspect nobody is checking their pressure when sitting on the bike - well apart from with the tpms!
« Last Edit: October 08, 2013, 10:53:42 pm by chrisb1 »

Offline patches

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Re: TPMS
« Reply #7 on: October 11, 2013, 10:25:38 pm »
*Originally Posted by enGage [+]
Mine are dead-on when cold.  I inflated the tires to the factory spec 36/42 and that's the reading I got pulling out of my driveway.  Keep in mind that the tires will heat up fast so that initial reading doesn't last long.

Mine is also dead on cold.  Always goes up when riding of course.  I assume 'cause there is no temperature compensation in the circuit.
« Last Edit: October 12, 2013, 01:45:01 am by patches »