lotlizard Posted May 3, 2018 Share Posted May 3, 2018 I just installed a TPMS system. Records pressure and temp. Does the rear usually run around 20 degrees hotter than front? Not sure if this thing is a lemon or that's normal. And what's a good indicator for tire temp before being concerned about a blowout for say a summer run in the desert? Link to comment Share on other sites More sharing options...
norcal616 Posted May 3, 2018 Share Posted May 3, 2018 I have used the TPMS and yes the rear is always hotter than the front... front tire hits the cool air first, rear tire rides just behind a hot exhaust... as for temps, I would be more worried about them being too cold when its 20°F out... I stopped using the TPMS...needs metal valve stems... 2012 wr250f - C-class 30+ age group 2015 fz-07- Hordpower Edition-80whp 2015 fj-09- Graves Exhaust w/Woolich tune by 2WDW @120whp Link to comment Share on other sites More sharing options...
pattonme Posted May 3, 2018 Share Posted May 3, 2018 starting PSI depends on load-out. asphalt temps will be much higher than ambient. Get an IR gun and set your 'cold' temps bearing in mind if your tire is sitting out in the sun it will be much warmer in it's "cold" state than if it's in shadow. Then ride for 20-30 minutes at intended speeds. measure pressure. If you're within 10, maybe 15% you're fine. If much more than that, then add 2-3psi. RIde another 30 min and see if it's stabilized. It might be helpful to ask the supplier what the max HOT PSI should be. If temps are getting away from you, ride slower. Or toss the luggage. Or wait for cooler conditions. If your tire looks like this, the air gauge is no longer useful. http://www.fastcoolcars.com/images/burnouts11/bike-burnout_flaming.jpg Link to comment Share on other sites More sharing options...
bmoto Posted May 4, 2018 Share Posted May 4, 2018 starting PSI depends on load-out. asphalt temps will be much higher than ambient. Get an IR gun and set your 'cold' temps bearing in mind if your tire is sitting out in the sun it will be much warmer in it's "cold" state than if it's in shadow. Then ride for 20-30 minutes at intended speeds. measure pressure. If you're within 10, maybe 15% you're fine. If much more than that, then add 2-3psi. RIde another 30 min and see if it's stabilized. It might be helpful to ask the supplier what the max HOT PSI should be. If temps are getting away from you, ride slower. Or toss the luggage. Or wait for cooler conditions. If your tire looks like this, the air gauge is no longer useful. http://www.fastcoolcars.com/images/burnouts11/bike-burnout_flaming.jpg Wow. That’s a totally new way of looking at it. Very cool. Does that technique apply to track days as well, or just road riding? just add 2psi from a normal baseline until hot temps to exceed 15% of an increase.... cool... Link to comment Share on other sites More sharing options...
pattonme Posted May 4, 2018 Share Posted May 4, 2018 no, you don't want to blindly keep adding 2psi - thats why it's helpful to know what max HOT pressure can be. Or if that is not forthcoming, then take max COLD * 1.1 as your upper limit. Track tires are more about reaching operating temp while also providing the desired level of braking stability and road adhesion. So take IR of surface immediately at end of session and examine rubber surface. Measure pressure. If not up to temp, then either ride harder or take a couple PSI out. Again just don't keep air out trying to get to OP temp. Lets's say it's a nice warm day and your tire vendor recommends 30-32F and 28R cold. Try it and see. He'll also likely have HOT psi in his back pocket too. Link to comment Share on other sites More sharing options...
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