Author Topic: WHAT TIRE PRESSURE WHEN TRIES ARE HOT?  (Read 222 times)

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Offline WFL

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WHAT TIRE PRESSURE WHEN TRIES ARE HOT?
« on: July 31, 2020, 01:28:32 am »
The other day i headed out for a ride and after i left the house I saw my tire pressures were 36 ft and 38 rear. By the time i made it to a gas station to pump them up i was at 39 ft and 40 rear. So i over filled them and figured i let some air out once they warmed up fully. Then got thinking I don't know or didn't remember what the hot tire pressure would be on a 85* day after the tires have warmed up. :??:  Anyone know off hand what the warmed up temps would be at say, on a 75, 80, 85, 90 or 95 degree day? Thanks :) :beerchug: :beerchug: 
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Offline Pittsburgh_Clem

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Re: WHAT TIRE PRESSURE WHEN TRIES ARE HOT?
« Reply #1 on: July 31, 2020, 01:38:56 am »
42 psi when cold
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Offline Boomer

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Re: WHAT TIRE PRESSURE WHEN TRIES ARE HOT?
« Reply #2 on: July 31, 2020, 09:47:08 am »
I set 42 psi at cold. Throughout the year that "cold" varies from 5C (41F) to 30C (86F).
Out on a ride, once I get the tyres fully "warmed up" that rises to 44 or 45 psi on the dash.
So, if I were you I'd top up fully warmed tyres to 45psi, and then ride it for a mile or 2 and see what the dash shows.
If it's close to 45 psi yer good.  :great:
If it's well over 45 psi then let some out.
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Offline connie_rider

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Re: WHAT TIRE PRESSURE WHEN TRIES ARE HOT?
« Reply #3 on: July 31, 2020, 12:50:23 pm »
I seldom add air when the tires re hot. 
   Normally add air before a ride.
 That said; In Houston, Cold is normally about 90-100*.

I set mine at 40 PSIG cold.
    Riding, the temp goes up to about 42.

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Offline Red Fox

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Re: WHAT TIRE PRESSURE WHEN TRIES ARE HOT?
« Reply #4 on: August 01, 2020, 02:30:32 am »
Rule of thumb is that hot tires measure 3 psi above normal cold tire pressure. 
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Offline Phil

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Re: WHAT TIRE PRESSURE WHEN TRIES ARE HOT?
« Reply #5 on: August 01, 2020, 03:39:43 pm »
If I have to ride somewhere to get air, I check the tires cold, and see how many pounds I need. I then ride to where I am getting air, and put the required air in. If the tire is at 39 psi cold, I add 3 pounds once I get to the station. So, if it reads 40 psi at the station, I fill it to 43 psi. It works well. It is generally spot on 42 psi the next morning after it has sat overnight.

I rarely have to do that though since I have multiple means with which to add air in the garage. I have done it on trips though, when I don't want to use the mini compressor.