Slow puncture?

omarm
omarm Posts: 73
edited August 2016 in MTB beginners
My tyres on my bike seem to lose air.
Yesterday gone down to 20PSI.
I pumped upto 40PSI.
This morning, it had gone down to under 35PSI.

I'm going out twice a day riding for 30 min twice.
The park has long bike tracks... so not doing anything that I would have though would cause any problems?

What should I do?

Thanks.

Comments

  • cooldad
    cooldad Posts: 32,599
    Take the tube(s) out and check in water to see if there are punctures.

    If so fix them.
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  • keef66
    keef66 Posts: 13,123
    If you have tubes, as above, take them out to check for leaks incl from the valve. Repair / replace as appropriate.

    If tubeless, do you have enough sealant in there? Dunk the whole wheel / mounted tyre in water to look for escaping bubbles
  • kajjal
    kajjal Posts: 3,380
    Run your finger along the inside of the tyre to carefully check for thorns etc. These need to be removed or you will keep getting punctures.
  • The Rookie
    The Rookie Posts: 27,812
    40-35psi can be caused by the small loss of air removing the pump from the valve combined with an overnight temperature drop.

    40psi is rather high!
    Currently riding a Whyte T130C, X0 drivetrain, Magura Trail brakes converted to mixed wheel size (homebuilt wheels) with 140mm Fox 34 Rhythm and RP23 suspension. 12.2Kg.

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