Normal Tire pressure loss following a ride.
#1
Senior Member
Thread Starter
Normal Tire pressure loss following a ride.
I am in the habit of checking tire pressure each ride... Should I need air, i'd rather do it with the floor pump at home... My clue as to a potential minor leak is how much air one looses during a 20 mile plus ride... Normally , It is like 3-5 lbs... For quite some time, on my commute bike the front has been loosing 7-10 lbs. range and the back less than 5. But, it has been quite some time.. And so far, it has not gone flat.. How much air do you expect to loose during a ride and has it any significance.
__________________
Pray for the Dead and Fight like Hell for the Living
^ Since January 1, 2012
Pray for the Dead and Fight like Hell for the Living
^ Since January 1, 2012
#3
Senior Member
I am in the habit of checking tire pressure each ride... Should I need air, i'd rather do it with the floor pump at home... My clue as to a potential minor leak is how much air one looses during a 20 mile plus ride... Normally , It is like 3-5 lbs... For quite some time, on my commute bike the front has been loosing 7-10 lbs. range and the back less than 5. But, it has been quite some time.. And so far, it has not gone flat.. How much air do you expect to loose during a ride and has it any significance.
#4
Senior Member
Join Date: Sep 2008
Location: NE Tennessee
Posts: 917
Bikes: Giant TCR/Surly Karate Monkey/Foundry FireTower/Curtlo Tandem
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 169 Post(s)
Liked 84 Times
in
62 Posts
My 700x23 road tires and tubes seem to be very tight as well with 120 PSI. I always release and repump before every ride, but when I check they are usually over 110 PSI.
But I am new and not an expert.
But I am new and not an expert.
#5
Senior Member
Join Date: Jun 2008
Location: Ridley Park, PA
Posts: 422
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
I inflate my rear tire to 120 psi and my front to 110 psi before every ride. When I re-inflate before the next ride, they're usually each at around 95-100 psi.
#7
Senior Member
#8
Senior Member
Thread Starter
^. As for me, I often ride 5 days out of 7. RIght now the bike in question is my local commute bike. 700 x 28... I'd say most of my tubes are almost always Performance's butyl, non - thin tubes.
__________________
Pray for the Dead and Fight like Hell for the Living
^ Since January 1, 2012
Pray for the Dead and Fight like Hell for the Living
^ Since January 1, 2012
#9
aka Phil Jungels
I find that I lose 5-10% over a 24 hour period. This is for a tire inflated at 85 psi or above. The lower the normal pressure, the less it will lose over time. Seems like I lose more when the air is warmer outside.
Seems like them little molecules of air sneak out better under pressure.....
Seems like them little molecules of air sneak out better under pressure.....
#10
Senior Member
Join Date: Jun 2008
Location: Ridley Park, PA
Posts: 422
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
#12
Senior Member
Join Date: Jun 2008
Location: Near Sacramento
Posts: 4,886
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
If you filled up with CO2, it'll lose pretty quick. The stuff bleeds through the rubber in the tube.
__________________
-------
Some sort of pithy irrelevant one-liner should go here.
-------
Some sort of pithy irrelevant one-liner should go here.
#16
Soma Lover
Join Date: Dec 2004
Location: Logan, UT
Posts: 765
Bikes: one bike for every day of the week
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
#18
Senior Member
Join Date: Jun 2004
Location: Northern Nevada
Posts: 3,811
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
three to five psi lost in a single ride seems high to me, but nowhere near disastrous (I check at the beginning of a ride but not at the end, so I don't actually know how much gets out). Time seems to be more of a factor than miles--I lose a few pounds over a few days whether I ride the bike or it sits in the garage. FWIW, I think the idea that you're losing more air in the checking process than through a small leak is probably accurate, but it's easy enough to put the inflated tube in a sink or big pot of water and look for bubbles if you suspect trouble.
#19
Senior Member
Join Date: Oct 2004
Posts: 5,250
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 7 Times
in
7 Posts
You should not lose ANY air over a four or five hour period unless there is a leak in the tube or valve. Temperature differences can make it seem as if you have lost air. If you are riding at 90 degrees at the beginning of a ride, but at 70 degrees at the end of the ride, the PSI reading might be a tad lower...not from loss of air, but from the cooler temperatures.
#20
CAT4
Join Date: Jun 2007
Location: Omaha, Nebraska
Posts: 1,681
Bikes: 2009 Cervélo S1, 2009 Felt F75, 2010 Cannondale Synapse Carbon 5, 2011 Cannondale CAADx, 2011 Specialized Transition Elite
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
You should not lose ANY air over a four or five hour period unless there is a leak in the tube or valve. Temperature differences can make it seem as if you have lost air. If you are riding at 90 degrees at the beginning of a ride, but at 70 degrees at the end of the ride, the PSI reading might be a tad lower...not from loss of air, but from the cooler temperatures.
#21
Senior Member
Join Date: Sep 2006
Posts: 1,195
Bikes: Kona Cinder Cone, Sun EZ-3 AX
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
My tires lose about 10% of their pressure per week, whether they're 50psi tires on a mountain bike, or 100psi tires on my trike.