Fix flat tire

You don't need to release air pressure to pump up the tire. If you have tubes with "presta" valve stems you need to unscrew the knurled nut on the end of the stem before inflating the tire. Presta stems also require the correct type of fitting on the end of the pump hose.

Rosie, Tires loose air usually for the following reason, could have a small puncture, Tire may have deep weather/cure cracking,valve stem leaking, tire to rim seal(corroded or damaged), even big changes in temperature can change air pressure in a tire.
Best to take it into a good shop and have diagnosed and repaired.
Check the attached links,instruction and guides for more info., Good luck.
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."
Why do my tires keep losing air
Why Are My Tires Always Going Flat
What Are the Causes of Tire Pressure Loss
http://www.city-data.com/forum/automotive/1545072-losing-air-pressure-one-tire.html

Fix-a-flat, partial can in each tire.

You need a set of tire levers to begin with.. anyplace that sells bike parts/tubes tires will have these.. they are just a nicely set of angled thin yet dull levers.

Using the levers you will need to lift one edge of the tire off the rim so the tire is half way on the wheel. To simply replace the tube.. continue on to B.

To completely remove the tire off the wheel.. flip the wheel over and using the levers pry the tire the rest of the way off the wheel. working your way around.. it will be snug then suddenly free.

Replaceing the tire is the same..except you only want to put it on half way before inserting the tube..


B. Remove the air stem cap and if you have the tool to remove the needle valve from the stem.. do that too as to let ALL the air out of the flat.. then pull the bad tube out.

Put the new deflated tube inside the wheel as flat and wrinkle free as possible starting with placing the air stem through the wheel.. and working it around until well seated.. some folks will use a bit of talcum powder on the tube.. usually they come dusted to allow them to properly fit when inflated.

Once you have the tube in the wheel.. start pressing the tire bead back under the rim.. depending on the wheel.. you may want to partly inflate the tube.. just a tiny bit.. so it will not get trapped between the tire and wheel rim when you re-seat the tire.. you can usually re-seat the tire to the rim with your fingers..becareful not to pinch yourself.

Inspect the wheel to make sure no parts of the inner tube is visible.. inflate to proper psi.. put on the stem cap.. replace the wheel.

You can buy a set of tire liners that will prevent punctures.. but of course this involves doing most of the above times four.

Lastly.. if you feel you just can't get it done.. stop by a good bike shop.. they will do it for you in just a few minutes.. possibly for no charge or little charge.

Best of luck!

Your tire tubes may have been replaced with urethane foam inserts - these give a comfortable ride like air-filled tires but cannot go flat - would explain why you don't see a fill valve - these inserts fit inside the regular tire carcass.
If they are worn out, you'll need to replace them, process is same as replacing a tube.

its somewhat hard to explain in words
check this video out
http://www.youtube.com/watch?v=u7KJK_rl9cU
also most bike stores will probably help you out for free

Hi, If you go to your local bike shop they will be able to help you. Regards marie

the tire industry recommends 32-34 PSI in all 4 tires

Usually, the needle used to inflate balls is an attachment to the pump. Is there a lever near the fitting the needle comes out of? Moving the lever 90 degrees from its current position should allow you to pull the needle attachment out. The hole the needle came out of is where the valve stem from your tire goes to pump the tire up. Jam the stem in the hole, crank the lever back to lock it in and pump away. Unlock the lever to release the stem when the tire's inflated and you're golden.

You need to purchase an adapter which pushes onto the valve (so it doesn't depress the valve stem) and the other end is a standard screw fix to a bicycle pump.

Any good bicycle store stocks them.

The valve you are desrcibing is pretty standard on racing type bicycles.

Good luck and let me know how you get on.