I lost about 1psi. inches per day in the front tire. I have checked for nails, screws etc and found nothing and the tire is only good for 6 months. (mileage 33 thousand). I added some slime and it slowed the leak down to about 2-3psi a week which isn't a problem as I have a 2hp compressor in my garage. The most interesting thing is that the leak slowed down over time, and at the first acceleration on the highway there was a noticeable imbalance in this tire, but only for a few kilometers.