Filling the Tire Attach the bicycle pump valve to the air valveon your tire. Keep in mind that bicycle pumps are muchslower to fill your tire than a powered pump, so it couldtake some time. Still, you want to at least get without5 PSI of the recommendation before you try to drive yourcar. If you are using a gas station pump thenyou are out and about, have a flat tire or very littleair in your tires or have a puncture, either way youneed air for your tires and in this scenario it is perfectlyfine to use the gas station air pump once youare careful. Before you pump, check the sidewall of your tire:It should list the pounds-per-square-inch (psi) range that yourtire can safely handle. Typically, a road tire can gobetween 80 and 130 psi, while a mountain tire holds between 30 and50 psi. Hybrids usually take between 50 and 70 psi. Follow these steps to add air to your tires: Park your vehicle by the air dispenser. Remove the cap from the tire valve on the first tire. Use your tire gauge to check the air pressure in the tire. Use the air hose to add air in short bursts. Keep checking the pressure until you get it right. Presta valves are easier to pump thanSchrader, because they have no valve spring toovercome. In narrow rims, clincher tires also leave insufficientspace between tire beads for larger Schrader valves. In contrast, Schrader valves are more robust, universallyused, and have an easily removable core.
How Do I Pump Up a Bicycle Tire With a PrestaValve? Remove the black cap from the Presta valve stem. Turn the lock nut on top of the stem counterclockwise until itis loose enough to allow airflow. If your pump has a lever to hold the valve, flip it down. Pump the air until the tire is properly inflated.
The Presta valve, also called French valve(FV) or Sclaverand valve is a valve commonly found inhigh pressure road style and some mountain bicycle innertubes. It comprises an outer valve stem and an innervalve body. The weakest point of a bicycle rim isusually the hole for the valve stem.
Ball pumps generally have a needle on the end, whereas bike tires require a “car connector”type plug instead. The pressure found in a ball pump alsodoesn't deliver enough PSI to the tire for a good ride. However, abike pump can be very inexpensive, and I recommendbuying one that can also handle Prestavalves.
Pump it up. Narrow tires need more air pressure than wideones: Road tires typically require 80 to 130 psi (pounds persquare inch); mountain tires, 25 to 35 psi; and hybridtires, 40 to 70 psi. To find your ideal pressure, start inthe middle of these ranges, then factor in your bodyweight.
So a bicycle tube with the Schrader valve can bepumped up at your local gas station if no hand pump(or CO2 cartridge) is available. If you don't have a bicyclepump that accommodates Presta valves (most allow bothnowadays), you could just screw on an adapter and inflate itusing the pumps at the gas stations.
Riding on a bottomed-out tire can damagethe tire, inner tube and rim. A flat tire may comeoff the rim, causing a crash. If you take a quick look downat your tires from time to time, you may catch atire going soft. A tire may seem fine when youget home and surprise you with a flat the nextmorning.
There are two basic types of valves that you'llfind on bikes: Presta and Schrader. For the most part, innertubes and tubulars on road bikes will use Prestavalves, and mountain bikes will use Schradervalves.
How to Check the Tire Pressure at a Gas Station Go to a gas station that has an air machine for fillingtires. Pick one tire to start with and locate the PSI label on thetire. Remove the tire air stem cap. Pull the air hose over to the tire. Read the pressure bar to see the current PSI level in yourtire.
How to Let Air Out of a Car Tire Locate the valve stem on the tire you want to let air outof. Rotate the valve stem cap counterclockwise with your fingers toremove the cap from the stem. Place the tip of a flat-head screwdriver over the top of themetal pin and press the pin inward.
If your tires are low on pressure, it maytake you several minutes of continuous pumping to fill eachtire. If you've filled your tires within the past fewmonths, and you're just topping them off, the process might last aslittle as 10-20 seconds.