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The om is only good if you have the oem brand/size tire. If in doubt the max psi is on the tire sidewalls. On a full bagger I would say they are heavy enough to run max psi all the time.
I have read somewhere on a tire websight they say a tire that sits will loose about 1/2 lb a month.
Do the soapy water thing and spray everything starting with the stem/valve, then the tire for a hole and the bead and the spokes if you have em. Buddy bought a brand new bike with spokes, rode it home the next day it was flat, coming from the spoke. Dealer told him to f off. Another story.
Thanks for the reminder. I'll have to check mine. I don't know what the dealer put in there but they look OK. I know the only way to know for sure is to slap a gauge on it though.
Use a good tire gauge, or at least the same one all the time to have a standard. This is not a Tour bike issue, but all inflated tire issues. As others said, check tire preasure cold. All tires might lose a couple of pounds preasure here or there. Garage floor could be cooler than outside etc...Just set preasure as recommended on owners manual.
Tires will lose pressure when ambient temperature drops. So depending upon how your bike is stored and the range of temperatures it's being exposed to, it's not at all unusual for it to lose several pounds fairly quickly.
As others have mentioned, make sure you have a quality tire gauge and check them in the morning when they're cold.
I check mine before every ride and keep a small air compressor handy for when I need to bump a few pounds.
There is a problem if you are losing two pounds a day. I would have the dealer check it out. Strange as it may seem, there have been instances of defective cast wheels that allowed slow air leakage through the wheel itself. With a brand new bike I would be back at the dealership. My experience is that they will take care of you.
O.M. says 36 front and rear but 40 rear if your running 2 up. I leave mine at 40 to 42 rear all the time and check it often. Also if you use the HD air pump for the shocks it works well AND you can remove it and not loose and air.
Had the same issue on the rear tire of my '07. Turned out to be a porous casting, and was replaced under warranty. I only have to add a pound or 2 a month now, which is probably the norm.
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