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How important is tire pressure really?

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  • How important is tire pressure really?

    I now have pneumatic tires with actualtubes inside themwhere previously I had theh airlesws inserts. I was told that the tubes are quite abit lighter than the inserts which was my primary motivation for changing. When I first pickedup my chairfrom the DMEthe tires were flat and soIhad themair them up before I left, but I do notthinkthey took themall the way up to their rated pressure of 110psi. I checked them the other day andthey were only around 50psi. At that time I tried to pump them up using a bicycle hand pump that I had laying aroundmy garage,but with that the best I could achieve was around 80 psi. I guess that I could use my air compressor and a regulator to fill them up to the recommended 110psi, but amwondering just how muchof adifference it would make relative to how much easier it will probably pop if it meets a sharpobject. How many ofyou actually inflate your tires to the recommended sidewall pressure of 110 psi. How many do not? Why or why not?

  • #2
    Originally posted by nauticalmike View Post
    I now have pneumatic tires with actualtubes inside themwhere previously I had theh airlesws inserts. I was told that the tubes are quite abit lighter than the inserts which was my primary motivation for changing. When I first pickedup my chairfrom the DMEthe tires were flat and soIhad themair them up before I left, but I do notthinkthey took themall the way up to their rated pressure of 110psi. I checked them the other day andthey were only around 50psi. At that time I tried to pump them up using a bicycle hand pump that I had laying aroundmy garage,but with that the best I could achieve was around 80 psi. I guess that I could use my air compressor and a regulator to fill them up to the recommended 110psi, but amwondering just how muchof adifference it would make relative to how much easier it will probably pop if it meets a sharpobject. How many ofyou actually inflate your tires to the recommended sidewall pressure of 110 psi. How many do not? Why or why not?
    The pressure tire is very important to keep them correct, the tires will last longer and will have less rolling resistence.

    So buy a compressor and inflate them for example 3 times per month.
    I fill mines up to 120psi.
    Having a compressor makes things easier.

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    • #3
      Cheng Shin crappy tires here and I keep them at their maximum ... less resistance while pushing.

      I've found hot/cold heat/aircon affects this as well.
      Roses are red. Tacos are enjoyable. Don't blame immigrants, because you're unemployable.

      T-11 Flaccid Paraplegic due to TM July 1985 @ age 12

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      • #4
        Originally posted by totoL1 View Post
        The pressure tire is very important to keep them correct, the tires will last longer and will have less rolling resistence.
        I agree. I use a good floor pump (I can stand) once a week to keep mine topped off at max recommended pressure.
        Chas
        TiLite TR3
        Dual-Axle TR3 with RioMobility DragonFly
        I am a person with mild/moderate hexaparesis (impaired movement in 4 limbs, head, & torso) caused by RRMS w/TM C7&T7 incomplete.

        "I know you think you understand what you thought I said, but what I don't think you realize is that what you heard is not what I meant."
        <
        UNKNOWN AUTHOR>

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        • #5
          It's not the quality of the tire that affects how quickly they'll lose pressure - it's the quality of the inner tube - I invest in high end tubes, which does two things, keeps the air a bit better/longer, and reduces the incidence of pinch flats.

          I would also get good tires - it's a weird thing, that when you pay twice as much for good tires, they seem to last much more than twice as long - over time, it can be less expensive to get the pricier tires.

          I push around a lot (4-5 miles a day usually), and I get 9 months or more out of my Schwalbe tires.

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          • #6
            Originally posted by JeffAdams View Post
            It's not the quality of the tire that affects how quickly they'll lose pressure - it's the quality of the inner tube - I invest in high end tubes, which does two things, keeps the air a bit better/longer, and reduces the incidence of pinch flats.

            I would also get good tires - it's a weird thing, that when you pay twice as much for good tires, they seem to last much more than twice as long - over time, it can be less expensive to get the pricier tires.

            I push around a lot (4-5 miles a day usually), and I get 9 months or more out of my Schwalbe tires.
            Which Schwalbe tires are you running? Which inner tubes, Schwalbes as well?
            stephen@bike-on.com

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            • #7
              Pump your tires up to, or close to, the max 110 and tell us you do not notice a huge difference. Also, running them under inflated can cause premature wear.
              C5-6 Complete - 8/13/1982

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              • #8
                I typically do not inflate them to max. At the cost of reduced rolling resistance I like that they are better over bumps and I can stay in place better (don't have to put brakes on to do one simple thing before the chair rolls backwards). Find what works best for you and your lifestyle.
                Last edited by SoulScream; 09-29-2012, 01:10 PM.
                Andrew

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                • #9
                  http://www.schwalbetires.com/ The pressure is EXTREMELY important. There is good and bad with high and low pressure. High correct pressure will provide a more stable ride, both horizontally and vertically but a bit less smoother ride. Low pressure will give you a smoother ride allowing the tire/tube configuration to absorb bounces. You do run a higher risk of instability the farther away you run the tire from the printed amount on the siewall. You need to determine what you are looking for. That Schwalbe link has a lot of wheelchair tires you can actually look at and get ideas about.

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                  • #10
                    I have Schwalbe right runs on a set of Spinergy LX, and Kenda Kontender's on my Topolino wheels. I use presta valve Continental inner tubes on both.

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                    • #11
                      I have the schwalbe marathons and schwalbe tubes, I keep them inflated to 150psi and check them every other week and they're usually down to 110-120. I do a lot of miles on them and like having the least possible resistance. I also go up/down a lot of big curbs so keeping the pressure high prevents the tube getting pinched.

                      I've got Schrader valves at the moment but will change to presta with the next set of tubes. I find getting a decent seal while inflating at high pressures can be tricky.

                      It all depends on your preference, see what you like.
                      T11 Asia A after near-fatal bike crash.. Just happy to still be here

                      No, I didn't loose my mind... It got scared and ran away!!

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                      • #12
                        I think tire pressure makes a huge difference in rolling resistance but I also don't like superhard tires because of bumps. I have Schwalbe Marathon Plus tires, Schwalbe high-pressure innertubes and Schwalbe high-pressure rim tape. I keep my tires 135-140psi.

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                        • #13
                          I would very much LIKE to keep my tires at the recommended pressure, but for some reason whenever I put my RightRuns or my Marathons to 120 psi the tubes blow within a day. I'm really getting sick of it.

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                          • #14
                            Originally posted by chaiale View Post
                            I would very much LIKE to keep my tires at the recommended pressure, but for some reason whenever I put my RightRuns or my Marathons to 120 psi the tubes blow within a day. I'm really getting sick of it.
                            The problem is either one of technique or some defect/damage to your wheel.
                            • Do you have high pressure rim tape applied to the inside of your rims?
                            • Have you inspected the rim walls for the presence of any burrs? (You should inspect the blown inner tube to see where the puncture is occurring; this may help lead you to the location of the problem if there's something sharp digging into your tube.)
                            • What size tires are you using? Are you sure you're using the corresponding sized inner tubes?
                            • Technique: who has been putting on your tubes/tires? The tube may be getting pinched during installation.
                            stephen@bike-on.com

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                            • #15
                              Originally posted by chaiale View Post
                              I would very much LIKE to keep my tires at the recommended pressure, but for some reason whenever I put my RightRuns or my Marathons to 120 psi the tubes blow within a day. I'm really getting sick of it.
                              I think the tubes are being pinched against the rim during installation. Innertubes can take a great deal of pressure. I had the same problem you are mentioning. I got better at installing my innertubes (learned how) and never got another blow-out. There is also a small possibility that you have some burrs or sharp points inside your rims but I doubt that's the problem. Just to let you know I went through $40 in innertubes in one day because I pinched everyone on the install. Argh.

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