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Front tyres slowly losing pressure
I pump the front tyres up to 40 and about a month later they've slowly lost their pressure to the point that the RFT warning light comes on, the driver's side goes down to around 32 but the passenger side one goes down to around 25, which I suspect is what causes the warning light to trigger.
The tyres are about non-RFTs, 2 years old with ~a good 4/5mm of tread left and i've had them checked for punctures but no one can find anything wrong with them. I've also had the wheels checked for leaks but again, nothing.
Is there anything else that could be causing this?
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