Losing tire pressure - Why - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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post #1 of 12 Old 07-23-2017, 07:39 PM Thread Starter
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Thumbs down Losing tire pressure - Why

I recently had a new set of Mitas E07 tires fitted. I have noticed that I am losing pressure, few PSI a week, whereas I never lose pressure on my other bikes at nearly the same rate. Could the dealer have screwed up the fitment of the new tires, they did mention they had trouble seating the bead on the front at least?? Is this something I need to have looked at, or is it a characteristic of these tires?
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post #2 of 12 Old 07-23-2017, 08:25 PM
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Beads sometimes leak. What you are describing could easily be that. Spread a little soapy water around each bead and watch closely. If it is only losing a few pounds a week, it will be quite hard to detect. Once you find it (if that is what it is) you can do a couple of things:
- take a hammer and hit the tire center of the tire, several times, at the area of the leak. Sometimes this will be enough to seat the bead. If that doesn't work, then...
- you will have to break the bead, clean the area well, and then reseat it.

There are tires that just leak. Not so much now but back in the day, Good Year race tires were called Blue Leaks for a reason.

Also, check your valve stem. The core may be leaking.
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post #3 of 12 Old 07-23-2017, 08:31 PM
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Have had valve cores leak,soap/water mix over it all so. Since its just started bet slight at bead is it as drrod stated.If you don't mind the stuff in your wheel a can of fix a flat may do it. Good luck.
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post #4 of 12 Old 07-23-2017, 09:49 PM
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I had a tire start losing pressure slowly after less than a week. Turned out to be ***two*** very small punctures less than an inch apart. (Likely a larger staple.) I didn't find them until I used soap and water.

I have a TPMS (tire pressure monitoring system with my Garmin GPS. It can drive you crazy watching the pressures swing with the temperature as cold pressures can easily fluctuate one or two psi.


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post #5 of 12 Old 07-23-2017, 10:02 PM
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I never worried a bout a pound or two on the TPS. It's the 5-10 that get my attention. As you ride heat and tire temp may change the reading a bit.
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post #6 of 12 Old 07-23-2017, 11:49 PM
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Check that it is not the valve leaking and if not put some tyre sealant in it.

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post #7 of 12 Old 07-24-2017, 09:32 AM
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I put new E-07's on my KLR for my recent Alaska trip. I lost a couple psi each week. I think that is pretty normal for motorcycle tires.

Great tires for all that loose gravel on the Alaska trip. Did 9,300 miles without a tire change. They were very comfortable on the slab also.

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post #8 of 12 Old 07-24-2017, 09:42 AM
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The Mett Tourance we put on for our DeadHorse trip .We never lost any TP or enough to add any on our 10,300 .The rear was shot on my Wee when back but front lasted till late fall.Some brands do seem to get away with a little? Temps can do a little allso. It was 28 and snow when we made DeadHorse first week in June!
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post #9 of 12 Old 07-24-2017, 10:13 AM
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Please do not put Fix a Flat in motorcycle tires. Or any tires, for that matter. It won't solve any problems and makes a flammable, disgusting mess. Most shops will refuse to work on a tire containing a sealer, or will charge extra to clean up the mess.

Your options are:

1) Monitor and reset air pressure at least weekly. You should be doing this anyway. Plus, 1-2 psi is well within the range of what's normal for most motorcycle tires. Motorcycle tires tend to naturally lose pressure a little faster than car tires. And bear in mind a normal pressure check on a motorcycle tire can bleed off 1/4 to 1/2 psi of pressure, so it's also normal to be a pound or half a pound low after checking a couple of times.

2) Remove the tires and clean the beads. Dealers and shops never bother taking the five minutes to clean the old rubber and any corrosion off the wheels before mounting new tires, and you can get quite an accumulation. When I started mounting my own tires, I always clean the beads and I found that my normal rate of air loss went way down. The first time through was horrible -- there was a lot of buildup in there. Of course, if you're having a shop mount your tires, you likely don't have the equipment and skills to do this, so it's sort of a moot point.
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post #10 of 12 Old 07-24-2017, 05:53 PM
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Check around the base of the tire stem also. Tires stems should be replaced with each tire change, but sometimes aren't. The rubber will eventually 'perish' and bend the stem may cause a slight leak.

At one time Yamaha sold "Tire mounting Lube" in a spray can, that was a lube when wet, but dried to a sticky sealer. Works great for bead leaks. Dunno if you can still get it.

Slime can help with slow leaks, although it will not seal them all.

Problem is, a MC tire has relatively small volume, so even a small leak will significantly affect pressure.
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