Metzler Tubes - Kawasaki KLR 650 Forum
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post #1 of 5 Old 08-09-2009, 11:19 AM Thread Starter
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Metzler Tubes

When I replaced the stock tires with Avon Gripsters I replaced the tubes also with Metzlers. Since then I've been losing about 3 - 4 pounds of pressure a week front and back (a little slower in the rear). Checked the valve stems with soapy water and find zero leakage there.

Anyone else experience this with these tubes? I'll be changing them out for another brand. What tube brands have given you the best service?
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post #2 of 5 Old 08-09-2009, 01:09 PM
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Losing a bit of pressure is not unusual. The rubber in an inner tube is semi-permeable to gas molecules. You're losing pressure because the oxygen molecules are escaping through the tube. The larger nitrogen molecules cannot pass through, which is why some tire shops promote filling tires with nitrogen (which is really kinda lame, as a car tire is thick enough not to lose too much oxygen in this manner - what it really promotes is people not bothering to check their tires). Air is about 2/3 nitrogen and the rest is mostly oxygen and trace gases.

Solutions are to switch to heavy duty tubes, go get the tires filled with nitrogen (which may be truly beneficial on a tubed tire), or (really old school) top them off once a week. You oughta be checking them that frequently any way...

Tom

Last edited by Tom Schmitz; 08-09-2009 at 01:13 PM.
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post #3 of 5 Old 08-09-2009, 04:59 PM Thread Starter
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I'll have to look at the boxes to see if the Metzlers were heavy duty. I still have them with the old OEM tubes in them. Reason I think it is unusual is that I have another bike with tubed tires and only see the seasonal fluctuation in pressures.
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post #4 of 5 Old 08-09-2009, 07:40 PM
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Originally Posted by flash View Post
I'll have to look at the boxes to see if the Metzlers were heavy duty. I still have them with the old OEM tubes in them. Reason I think it is unusual is that I have another bike with tubed tires and only see the seasonal fluctuation in pressures.
flash -

Interesting. Every tubed tire I've had has lost some air over time. My bicycle tires can lose 10 -15 pounds in a week. The stock tubes in my KLR lose a pound or so a week. The tubed tires on my Triumph Spitfire might lose a pound a every few months.

i used to ride on sewn-up (tubular) bicycle tires that had a natural rubber tube in them. They would lose 20 psi overnight. Schwinn experimented with some synthetic tubes that never lost air, but they weren't very elastic and required special patches if you flatted. They flopped.

I think it's normal for tires to lose a bit of pressure over time, but if the loss is more rapid than you think it should be, you might want to check, or replace the valve cores. They might be the culprit with a leak to slow to detect by the soapy water method.

Tom
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post #5 of 5 Old 08-09-2009, 08:00 PM Thread Starter
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Tom, not to say my other tires do not lose any pressure.....just at a much slower rate, leading me to think there may be something off in the Metzlers.

Easiest for me to do is replace the schrader valves for now. See how it does.

Thanks for the input !!!
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