low pressure rear tire light

[kniterider]

AND so it starts again.  I managed to get dealer to replace both TPMS sensors a month or so agao.  worked great for about 4 weeks.  NOW I am getting a constant red warning light and a REAR TIRE LOW reading on dash  all while SHOWING 40 PSI

[H2OSMRT]

I'm getting the same thing. Have nearly 4k miles on my 2015 and it started on a trip to higher elevation. It would occasionally turn off but then come back on again. Guess it's time to take it in to a dealer (100+ miles away!)

[Coconut]

Hi kniterider,

Sorry if this is stating the obvious, but 40 PSI IS Low Pressure !

OK, so it's only 2PSI under the recommended figure,
but is that the figure that's displayed while you're riding ?

42 PSI is the recommended COLD tire presssure,
and this will increase by a few PSI as you ride an the tire heats up,
so the indicated PSI would be even higher.

Together wth the automatic adjustment for ambient for temperature,
could it be that the Warning IS correct, and your tire is slightly underinflated ?

Cheers 

[AZBob]

Originally Posted by Coconut

Hi kniterider,

Sorry if this is stating the obvious, but 40 PSI IS Low Pressure !

OK, so it's only 2PSI under the recommended figure,
but is that the figure that's displayed while you're riding ?

42 PSI is the recommended COLD tire presssure,
and this will increase by a few PSI as you ride an the tire heats up,
so the indicated PSI would be even higher.

Together wth the automatic adjustment for ambient for temperature,
could it be that the Warning IS correct, and your tire is slightly underinflated ?

I was going to say the same thing. 40 psi IS low. The threshold is only about 2psi for the warning.

Over those 4 weeks, how many times have you manually checked and set the proper cold tire pressures? During seasons when the ambient temperature fluctuates a lot day-to-day, I find I have to do it every week or more.

[kniterider]

Ok I got spoiled by my dark side rides.  Hate the rock hard riding characteristics at 40+ psi.  But that did seem to rectify the red light.  probably have the dealer shut that tpms off entirely when I replace the rear tire with a bridgestone drive guard run flat .  My garmin TPMS is much more accurate and user adjustable  anyway  Thanks Coconut

[H2OSMRT]

I read on another TPMS conversation that someone deflated the tire and then re- pressurized it to the correct cold pressure (42). Decided to give it a try and so far it seems to be working properly again. I love simple fixes - beats a 100+ mile trip to the dealer but then again, that would have been a nice 200 mile ride on the Trophy which is always a joy!!!

[earthman]

Originally Posted by kniterider

Ok I got spoiled by my dark side rides.  Hate the rock hard riding characteristics at 40+ psi.  But that did seem to rectify the red light.  probably have the dealer shut that tpms off entirely when I replace the rear tire with a bridgestone drive guard run flat .  My garmin TPMS is much more accurate and user adjustable  anyway  Thanks Coconut

If you do run the rear at 40psi or less, what's your thoughts on the safety aspect? I'm wondering how fast/far you would have to travel for it to fail basically??

[kniterider]

I already know from my time in collision analysis that the stock motorcycle tires are no where near as safe as a really brand name high performance car tire, A goldwing tire for 225.00 has a load capacity of about 900 pounds,  now the bike itself weighs more than that , plop two middle aged adults on there load up the saddle bags and tail trunk along with a trailer hitch and you are SOOOO over stressing that tire.. whereas the michelin alpin run flat is rated at over 1400 pounds.. I purposely deflated it on my fully loaded wing to see what it would do   ,,because all the end of the world folks swore it would come off the rim.. . I rode that tire for almost 10 miles up to highway speeds   NO PROBLEM try that on your stock tires.  In all my research  thru past accident files for single vehicle fatal and non fatal motorcycle accident reports, I found dozens involving catastrophic tire failure as the primary cause of the accident  WHEN it was a factory or stock replacement tire  BUT not one  involving a car tire

and running a car tire at 30 PSI takes a whole lot of stress off the suspension when fully loaded and most important it keeps my wife comfortable for 1000 miles.  Plus if I go down ,,its my fault  but carrying her I want the safest tire I can for all that load and heat