Why is my tire not inflating past 30 psi?

There could be a few reasons why your tire is not inflating past 30 psi. It could be due to a leak in the tire, a problem with the valve stem, or an issue with the air pump. It's important to check for any visible damage to the tire and valve stem, and also ensure that the air pump is functioning properly. If the issue persists, it may be best to consult a professional mechanic for further assistance.