Normal
Pump ur tyres and dump in water and look for leaks. There could be cracks or pin hole in ur rims. I ever encountered a small pinhole where the air escapes, this was on 17" TSW IMOLA rims. Had gone into a pot hole. Once u found the hole on the rims use superglue to cover or best still araldite(epoxy). Another solution dump ur rims and get a new one hehehehehe
