Assuming you're asking how to check if your bike tires are over inflated:
There are a few ways to tell if your bike tires are over inflated. One way is to simply look at the tire. If the tire looks very round and firm, it is probably over inflated. Another way to tell is to feel the tire. If the tire is very hard to the touch, it is also probably over inflated.
The best way to check, however, is to use a tire pressure gauge. Most bike pumps will have a pressure gauge built in, so you can check while you're pumping up the tire. Generally, road bike tires should be inflated to around 80-100 PSI, and mountain bike tires should be around 30-50 PSI. If the pressure in your tire is significantly higher than these numbers, it is probably over inflated.