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So I'm at 15k miles on my Michelin pilot activs and know that I have to replace them at some point but everything has been feeling good until the last few rides I started feeling some kind of drift on the back tire like it didn't want to stay in line.

Got a little nervous and stopped riding in the rain and other wet conditions, but even on dry ground it was giving me a weird sensation every turn.

Well, turns out I let the tube get down to around 15-20 psi. I haven't aired these things in months and the weather changes must have done a number on them. Either way, probably time to get them looked at for replacement and it probably wouldn't hurt to actually check my pressure every once in awhile.

Hope that spring weather is coming soon for you all up north.
 

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Ahhhhh yes, running your tires with only 1/3 to 1/2 of the recommended pressure will cause a little squirreliness! I check my tires at least every other week in the riding season and always have to top them off, usually 2 to 3 lbs. Here in the north, I check them before every ride when the temperature drops below 50. Cold, windy and rainy here today, but it's better than the snow we got yesterday! Ride safely! Jevers
 

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Out here in the desert, I check mine every week. The heat really does a number on the pressures.
I keep mine aired up to the max
I would imagine that the pressures out there would only increase with the heat. My thinking is to set your cold air pressure maybe 2 to 4 psi lower than the recommended?
Have you ever checked your tire pressure after a ride in the heat? I would bet that they are pretty high. Jevers
 

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I would imagine that the pressures out there would only increase with the heat. My thinking is to set your cold air pressure maybe 2 to 4 psi lower than the recommended?
Have you ever checked your tire pressure after a ride in the heat? I would bet that they are pretty high. Jevers
I'm with Jay. Ambient temps can really mess with running tire pressures. I wonder if the increase in temps of a tube-type tire is also greater than that of a tubeless one due to the additional "bulk" and internal friction of that added rubber perhaps holding heat in like insulation instead of allowing it to better dissipate? -eddie
 

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I would imagine that the pressures out there would only increase with the heat. My thinking is to set your cold air pressure maybe 2 to 4 psi lower than the recommended?
Have you ever checked your tire pressure after a ride in the heat? I would bet that they are pretty high. Jevers
Yeah, In the summer I drop 2 lbs, but the problem is that tire pressure does increase but when they cool off they loose pressure quicker. So it seems
 
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