Lezyne Dual Pump Head - Having Trouble
07-13-22, 05:09 PM
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Lezyne Dual Pump Head - Having Trouble - Solved
Replaced the worn out pump head on my Zefal floor pump. I chose the Lezyne dual pump head because I have had great success with thier other products. My problem is that the Presta side of the head does not slide down far enough to engage the valve stem. I can still pump up the tire by just over pressurizing the valve but the gauge on the Zefal floor pump will not show the tire pressure but rather the residual pressure in the pump hose. I am now just pumping up the tire to a ball park figure then checking the pressure with a Presta Tire pressure gauge.
Is this going to be a regular method or will the head loosen up to the point the presta valve gets depressed allowing for a better reading on the floor pump gauge? Or is there something I am missing in its application?
SOLVED: As suggested I applied some silicone grease to a Presta Stem and the inner O ring. I still had the problem and could not get the stem down into the head far enough to actuate the valve. I then took a round wooden skewer just large enough to fit into the head and closed the head with the lever around it . At removal and examination hole in the head was now larger. The head now slides onto the Presta stems normally. I suspect that the O ring in the head was not seated properly and after closing around the skewer it is now in place where needed.
Is this going to be a regular method or will the head loosen up to the point the presta valve gets depressed allowing for a better reading on the floor pump gauge? Or is there something I am missing in its application?
SOLVED: As suggested I applied some silicone grease to a Presta Stem and the inner O ring. I still had the problem and could not get the stem down into the head far enough to actuate the valve. I then took a round wooden skewer just large enough to fit into the head and closed the head with the lever around it . At removal and examination hole in the head was now larger. The head now slides onto the Presta stems normally. I suspect that the O ring in the head was not seated properly and after closing around the skewer it is now in place where needed.
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No matter where you're at... There you are... Δf:=f(1/2)-f(-1/2)Last edited by zandoval; 07-14-22 at 03:05 PM. Reason: Solved
07-14-22, 08:10 AM
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If the new gasket is too tight, I would try a little bit of silicone lubricant.
07-14-22, 02:10 PM
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I think that my pump heads work the same as yours on Presta valves; they DO have a pin to depress Schrader valves.
07-14-22, 02:27 PM
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I don't know if the Lezyne Dual Valve pump head is designed to open Presta valves. Have you looked inside the Presta opening to see if there is any feature inside there that looks as though it would open the valve?
Lezyne's ABS-1 Pro HP chuck does not open Presta valves, so using the pump proceeds pretty much as you describe. When you start pumping, you are just pumping up the hose until you get a high enough pressure to crack the Presta valve. After pumping a tire, the pressure in the tire is always a bit less than was indicated on pump gauge, owing to the cracking pressure of the Presta valve.
I bought a Lezyne floor pump that came with the ABS-1 Pro HP, but also bought a Dual Valve head because I thought I would like that better. The ABS-1 Pro HP ended up winning me over.
Full disclosure: I don't have to move back and forth between Presta and Schrader frequently. If I did, then I might use the Dual Valve head.
Lezyne's ABS-1 Pro HP chuck does not open Presta valves, so using the pump proceeds pretty much as you describe. When you start pumping, you are just pumping up the hose until you get a high enough pressure to crack the Presta valve. After pumping a tire, the pressure in the tire is always a bit less than was indicated on pump gauge, owing to the cracking pressure of the Presta valve.
I bought a Lezyne floor pump that came with the ABS-1 Pro HP, but also bought a Dual Valve head because I thought I would like that better. The ABS-1 Pro HP ended up winning me over.
Full disclosure: I don't have to move back and forth between Presta and Schrader frequently. If I did, then I might use the Dual Valve head.
