Mine mysteriously is missing and the air won't stay in the tire, but I don't know if the tire is damaged of if the cap matters. Can anyone help?
2007-06-20 11:22:18 · 8 answers · asked by eclectic 1 in Sports ➔ Cycling
Yes and no.
The presence of caps prevents accidental pressing of the stems.
The lack of the caps has no functional use, except preventing the above problem.
If the air will not stay in your tire, you have a flat. You could have a damaged valve stem, or a hole in the tube. Either way, you'll have to buy a new tube. Most reputable shops will sell patch kits, but rarely (if ever) use them.
2007-06-20 11:33:51 · answer #1 · answered by jcurrieii 7 · 0⤊ 0⤋
The cap only protects the pin in the valve from being broken or pushed down. It should hold air without it. You most likely have a leak. Pour soapy water over the tire and look for bubbles forming.
2007-06-20 11:30:53 · answer #2 · answered by shortstop42000 4 · 0⤊ 0⤋
A metal or plastic screw-on cover intended to protect the innards of a tire valve from dust and other foreign matter.
In the case of Presta valves, which have non-removeable, built-in caps, external caps are unnecessary in use. The purpose of these redundant caps that come with Presta tubes and tubulars is so that the pointy end of the valve won't puncture your spare tube or tubular while it is rolled up. There's no reason to use them in actual riding.
2007-06-20 11:33:04 · answer #3 · answered by Robert S 6 · 0⤊ 0⤋
Cap or no cap, air should stay in your tire.
If air won't stay, maybe you have a puncture or a broken / defective valve.
2007-06-20 17:20:35 · answer #4 · answered by riqtan 4 · 0⤊ 0⤋
Yes, valve cap is the thing that keeps the air inside the tyre. Unless is need an extra fitting or pressure to bleed the air, i'd get a replacement.
2007-06-20 11:31:39 · answer #5 · answered by plasmajosh 4 · 0⤊ 3⤋
the cap doesn't matter it only keeps the valve safe from branches and rocks, maybe the inner tube has a hole get a new one and change it
2007-06-20 20:43:57 · answer #6 · answered by G-T Rider 3 · 0⤊ 0⤋
I don't think that the cap matters, but you might have something wrong with the valve.
You can buy new tubes, though.
2007-06-20 12:32:31 · answer #7 · answered by Roberto 7 · 0⤊ 0⤋
Its possible that dust or dirt could get in and cause the valve to leak, but you'll probably flat and replace the tube long before that happens.
2007-06-20 12:31:51 · answer #8 · answered by silverbullet 7 · 0⤊ 1⤋