I've had this same thing before.All inner-tubes and tubeless tyres will loose pressure over time,but i found the cheap tubes to leak quite a bit more than the Michelin or Conti tubes.What you could do to cure it,is use one of those airosol "tyre repair/re-inflator" things that you get from most garages.It'll leave a sealant inside the tube that will seekout and seal-up and micro-leaks.Or insist on the thick enduro type tubes being fitted every time you get a new tyre fitted.
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Just going for a short ride on my bike....
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Just going for a short ride on my bike....
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