I want to pump ... you up!
12-07-07, 01:18 AM
#1
Senior Member
Thread Starter
Join Date: Apr 2007
Posts: 158
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
I want to pump ... you up!
Help please, I'm losing a lot of air in my tires every time I remove the pump from the valve (well, almost every time).
I have Schraeder valves and a Specialized floor pump. The pump has a long hose, and at the end there's a lever which can be set "up" or "down".
Please correct me if I'm doing anything wrong:
* Lever down. Stick hose onto valve and press down a bit (how much?). (Of course I'm not a total noob, I did remove the valve cap first!)
* Move lever up. Start pumping until meter reads 80.
* Snap lever down, and try to instantly remove the hose from the valve. Here there usually is a struggle, and I'm not sure how hard to yank/twist. I hear hissing and ...
* By the time it's off, the tires usually have the same amount of air they started with.
I have Schraeder valves and a Specialized floor pump. The pump has a long hose, and at the end there's a lever which can be set "up" or "down".
Please correct me if I'm doing anything wrong:
* Lever down. Stick hose onto valve and press down a bit (how much?). (Of course I'm not a total noob, I did remove the valve cap first!)
* Move lever up. Start pumping until meter reads 80.
* Snap lever down, and try to instantly remove the hose from the valve. Here there usually is a struggle, and I'm not sure how hard to yank/twist. I hear hissing and ...
* By the time it's off, the tires usually have the same amount of air they started with.
12-07-07, 03:23 AM
#3
Conservative Hippie
Join Date: Mar 2005
Location: Wakulla Co. FL
Posts: 4,271
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Are you sure the air you're hearing escape is coming from the tire and not the hose on the pump? Are you checking the tire pressure with a gauge, other than the one on the pump where the air has to fill the hose before getting to the gauge?
12-07-07, 08:59 AM
#5
Mad bike riding scientist
Join Date: Nov 2004
Location: Denver, CO
Posts: 27,363
Bikes: Some silver ones, a red one, a black and orange one, and a few titanium ones
Mentioned: 152 Post(s)
Tagged: 1 Thread(s)
Quoted: 6219 Post(s)
Liked 4,218 Times
in
2,365 Posts
Help please, I'm losing a lot of air in my tires every time I remove the pump from the valve (well, almost every time).
I have Schraeder valves and a Specialized floor pump. The pump has a long hose, and at the end there's a lever which can be set "up" or "down".
Please correct me if I'm doing anything wrong:
* Lever down. Stick hose onto valve and press down a bit (how much?). (Of course I'm not a total noob, I did remove the valve cap first!)
* Move lever up. Start pumping until meter reads 80.
* Snap lever down, and try to instantly remove the hose from the valve. Here there usually is a struggle, and I'm not sure how hard to yank/twist. I hear hissing and ...
* By the time it's off, the tires usually have the same amount of air they started with.
I have Schraeder valves and a Specialized floor pump. The pump has a long hose, and at the end there's a lever which can be set "up" or "down".
Please correct me if I'm doing anything wrong:
* Lever down. Stick hose onto valve and press down a bit (how much?). (Of course I'm not a total noob, I did remove the valve cap first!)
* Move lever up. Start pumping until meter reads 80.
* Snap lever down, and try to instantly remove the hose from the valve. Here there usually is a struggle, and I'm not sure how hard to yank/twist. I hear hissing and ...
* By the time it's off, the tires usually have the same amount of air they started with.
The hissing and whoosh of air you here when you take the pump head off is the air inside the pump hose. Don't worry about it.
The one caveat is that sometimes the nipple on the schrader pumphead can remain in contact with the valve and let some pressure out. Try not to rock the head taking if off but schrader pump heads are usually pretty loose.
Presta heads are very tight but there isn't anything in the head to push down on the valve so you shouldn't lose any air. Try to pull the head straight up and off and resist twisting it from side to side. this can bend the stem.
__________________
Stuart Black
Plan Epsilon Around Lake Michigan in the era of Covid
Old School…When It Wasn’t Ancient bikepacking
Gold Fever Three days of dirt in Colorado
Pokin' around the Poconos A cold ride around Lake Erie
Dinosaurs in Colorado A mountain bike guide to the Purgatory Canyon dinosaur trackway
Solo Without Pie. The search for pie in the Midwest.
Picking the Scablands. Washington and Oregon, 2005. Pie and spiders on the Columbia River!
Stuart Black
Plan Epsilon Around Lake Michigan in the era of Covid
Old School…When It Wasn’t Ancient bikepacking
Gold Fever Three days of dirt in Colorado
Pokin' around the Poconos A cold ride around Lake Erie
Dinosaurs in Colorado A mountain bike guide to the Purgatory Canyon dinosaur trackway
Solo Without Pie. The search for pie in the Midwest.
Picking the Scablands. Washington and Oregon, 2005. Pie and spiders on the Columbia River!
12-07-07, 07:35 PM
#6
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
I'm with this guy--I sweated that for years until a mechanic told me it was just air escaping from the hose. A three-foot length of air hose at 100psi or whatever will take a second or so to equalize, and you may be hearing that.
