How to Repair a Bicycle Tire : How to Check Bicycle Tire Pressure

How to Repair a Bicycle Tire : How to Check Bicycle Tire Pressure


So, lets say your bike needs to be pumped
up. The first step would be to remove the valve cap, which we’ve already done. Most
pumps are equipped today with two apertures, the larger one is for the schrader valve,
the smaller is for the presta valve. We’ll start by showing you how to use the schrader
valve. The first step would be to push this on, you usually have to cover all the threads,
and then clamp it. Some pump chucks work in reverse, you have to flip the lever up to
clamp, some down to clamp. We look at the gauge, it’s reading fifty pounds, you should
look carefully on the sidewall on your tire, its pressure rating will be listed there.
This particular tire is sixty to eighty pounds, so we’re going to pump it up to a minimum
of sixty, if you’re a heavier rider you want to go right up to the eighty pounds, if the
tire is old and dry rotted you may want to stick to the lower pressure rating, and then
get to the shop and replace it. When done, release the lever, often you’ll hear some
air escaping, that’s only air coming out of the pump itself, find your valve cap, and
replace it. On these kinds of valves, the valve cap is there to keep dirt out, not to
hold pressure in. On a presta valve, it’s an added step, after you remove the cap, you
do have to loosen this, it does not come off completely, if it does it’s broken. Second
step here is to touch it once, make sure that it’s not stuck, when they sit for a while
they stick. Push on the chuck, carefully as not to bend the mechanism, clamp it, check
your pressure, usually after a stroke or two on a high pressure tire. This tire is right
up to pressure, probably pumped in the last few days. This tire is rated for about a hundred
and twenty, and there we go. Now, releasing the chuck on a presta valve, you want to flip
the lever to its release mode and gently wiggle it straight off. Once again we heard a bunch
of air come out, it’s from the hose, if you pulled it straight off you didn’t lose any
out of the tire. Very important, you’ve gotta close the valve and you’re done.