[nauc]

can temperature screw up tire psi this much....

my tires have a psi range of 35-65, i keep them right at 40psi. the last time i went riding was about 1.5 months ago, ive been busy. so yesterday i went for a ride and both tires were at 14psi. where i live, its been around 60 degrees at night and as high as 108 during the day. i keep my bike in my garage, so it sees even worse temps than that. can those types of temp changes zap my tire psi. i thought maybe i had two slow leaks but the last time i went riding, i was on pavement and im not usually around any thorns or anything and i use Mr. Tuffys too.

thanks

 

[tnor]

Short answer: yes.

Be sure to pump up your tires every time before you ride, even if you just pumped them up the day before, it's always a good idea to check. If you hadn't touched them in a month and a half that's not that unusual that they would be down that low. On my road bike i've had it drop 10-20 psi in 24 hours. My mountain bike tends not to loose that much on a day to day basis but I still always check.

 

[MMike]

Pv=rt

 

[oldfart]

Pffft. In 1.5 months the tubes simply leaked as is normal. If tubes and tubeless tires were perfectly sealed and never leaked, temperature changes might change the actual psi a bit, but it would go back to normal with the temperature.

 

[Westy]

Pv=rt

And since T is in Kelvins unless you set your tire pressure on the south pole then ride in death valley temperature isn't going to make that much difference.