The recommended tire pressure for your bike depends on several factors, including the type of bike, the tire width, and the riders weight. Here are some general guidelines based on bike type and tire width:

• Kids bike tires: 20-40 PSI
• Narrow tires/road bikes: 80-130 PSI
• Medium tires/hybrid bikes: 50-70 PSI
• Thick tires/mountain bikes: 30 PSI (off-road) to 50 PSI (on-road)

Its important to note that these are general ranges, and every tire has a recommended PSI printed on its side close to where it touches the rim. This is usually written as a range, since there are reasons why youd want to be on the higher or lower end. If your tires dont indicate a recommended pressure, a basic rule of thumb is to pump them up until theyre firm but still slightly squeezable.

Ultimately, the pressure you need to run will vary depending on the rider, bike, and road conditions. Its fairly easy to get into the right ballpark by following the guidelines above and experimenting with different pressures. Start with small steps in pressure of around 5 PSI, and pay attention to how the bike feels. You should eventually be able to determine a sweet spot for speed, comfort, and performance.