As Stig said there shouldn't be a pressure drop. I have not added air to my agility rear since it was installed 11 months ago. The front has stayed at 18psi and the rear at 34.
These are recommended values for your scoot?
In the manual for the City model, it's
1.5 bar front (21-22psi), 2.0bar rear (29psi).
Both tires are 16".
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