Tire pressure loss


Active Member
hi guys I'm trying to understand why our bike tires lose air after a couple of weeks or when there's a tempature change. On cars that's not the case so what's the difference ?
For starters, there are certainly different qualities of valves out there—some leak more than others. Depending on your tire, bicycle tires typically hold a higher pressure than car tires. Also, car tires are significantly larger than bike tires, so the very slow loss of air is far less noticeable and represents a significantly lower percentage of the total air volume. Likewise small changes in air pressure due to air temperature in that smaller volume equals a greater difference.
Until I installed some quality Schwalbe inner tubes, I had to air up just about every week. Was running relatively cheap tubes. Now its not too often at all.