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New tires, new tubes. Lost 10 lbs psi in 4 days, and ideas?

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  • New tires, new tubes. Lost 10 lbs psi in 4 days, and ideas?

    Bought quality tubes and Sinko tires had them professionally installed Friday. Went to take the bike out today and the bike rode very loose and rear tire seemed like it was wobbling. Pulled into a gas station and both tires were down by 10 lbs. After filling the tires the bike appeared to ride nicely. I should have checked the tire pressure but took it for granite new tubes should hold air better than that. Hate to think the installer pinched both tubes. Thank you for any replies.

  • #2
    Did you verify with the installer what PSI you wanted, and that it was correct when you left the shop? I think PSI can drop with new tires at first, but 10 PSI seems like a lot. I'd just keep an eye on it.
    Manuals, Roadwing, other stuff
    PGR
    PGT MT

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    • #3
      He set the rear at 42, the front 36. When I rode the bike home was great. Let the bike sit for 4 days. When I rode it today felt like I was rining on shifting sand. After adding air did some tight slow turns in a parking lot and rode down the highway. the bike felt normal. So, in reality, the front lost 6 lbs the rear approx 10.

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      • #4
        I find that my new tires will stretch some and then stabilize in a few days. Shinko tires may even have weaker side walls than you are used to. Also, I’ve had brand new valve stem cores not seat well. Take them out and see if they operate smoothly with your fingers. Replace them if they don’t consistently seat. Make sure they are in snug.

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        • #5
          Valve stems will be checked. The last time I lost air in a tube was a faulty valve stem. I hope that is what it is.

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          • #6
            Temperature of the installed air could have a lot to do with it.

            Unless they use an air chiller-drier at your shop, compressed air can be fairly hot coming out of the compressor.
            Hot air will contract once it cools, dropping pressure & it could be quite a lot.
            New tires also do sag/stretch a little & can make the pressure drop more noticeable.

            I'd just recheck & top-up cold pressure in both tires for now, then keep an eye on them for a few days.

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            • #7
              Agree with Bubba and others. All my new tires usually take a couple top offs to stabilize.

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              • #8
                Good point as it was a hot day when the tires were installed. As soon as the rain stops, probably tomorrow I will check the pressure again. Really appreciate the comments. I am a worry wart when it comes to the bike and things going wrong.

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                • #9
                  I'd bet a that the hot day & even hotter compressed air is the root of your low pressure.

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                  • jd750ace
                    jd750ace commented
                    Editing a comment
                    Totally agree.

                • #10
                  Bad gauge on his end or yours?? Maybe i dont know without testing with same no way of knowing. Top it off and see a couple days of cooler weather coming our way so should find out.

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                  • #11
                    I've seen when tires have tubes in them that sometimes, air gets trapped between them. and when they sit the air will work it's way around to the sides, go out the spoke holes, or past the valve stem. If they continue to lose pressure, then there is something else wrong.
                    "Do or do not, there is no try."

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                    • #12
                      Good news, so far. Checked tire pressure, no issues, did not drop. Rode the bike and tires tracked excellently. Next ride perhaps Sunday, as fall is setting in and not many rides left. Going to recheck the pressure Sunday.

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