Hello everyone.

I recently got myself a mountain bike from Canyon. It all works, got myself all the gear, pumps and all. And the pressure gage give me a reading of 10 PSI, which is odd because the tires are firm. 10 PSI should be nearly flat.

I have other pumps, including one that works for my car too, which I trust because I cross checked its values with my mechanic.

Here’s the odd thing. I got the bike out and plugged it to the car tire pressure device and it also gave me a reading of 10 PSI. I also have a Topeak Shuttle Gage, 10 PSI.

How is that possible? I can’t really believe all three readings come from faulty devices so I’m thinking I’m the one doing something especially stupid, or maybe a defect somewhere on the valve/tire but it’s brand new, so I think I’m the one to blame. Any ideas where I’ve been an idiot?

I did open the nut on the presta valve prior to taking measurements.

      • j4k3@lemmy.worldMEnglish
        2·
        3 months ago

        This is my floor pump against a typical presta valve easily holding ~175psi. You should be able to get well over 100psi on any floor pump against a closed valve.

        Take the bike/pump to a local bike shop to compare readings and pressures against a known good source or at least just take your pump(s) and verify against a known good pump.

        • Natal@lemmy.worldOP
          2·
          3 months ago

          There’s no risk to using force? Maybe I just didn’t push hard enough because I was scared to put too much pressure on the presta and bend it. They look weak.