Mine are probably the same Chinese quality , 11.3 mm is the stem hole diameter in the wheel, I installed mine facing the right side easier to access on side stand, facing the rear left could interfere with CVT case ??
If you're loose over 5 psi in a month, your tire is leaking !
Do the soapy water leak check, make sure your valve stem, core valves+caps are tight not leaking air and/or replace them. Is not a bad idea to carry one of those metal caps with built-in core tool in tool kit, to occasionally check the cores, JIC.
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