Bicycle Mechanics - Tube leaking/popping internally.
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03-27-07, 12:36 PM
Ok, I checked the tire. Nothing is punctured. On the rim that rubbery surface that covers the holes has one hole in it. On the tube there is a hole at the same spot as well where the rim hole is.
I'm new to this but is that rubbery thing on the rim, rim tape? Or is rim tape something that goes on top of that rubbery thing?
It is frustrating because I've patched the hole yesterday then after patching it and putting the tire back on I pumped up the tire and 10mins later there was a muffled pop sound then a "psssssst" that leaked the air out rapidly. I took off the tire again and checked and it's the same area that I patched. So a friend of mine suggested I use electrical tape to cover it up. I went a step further and took the cardboard backing of a writing pad and cut off a piece and taped it over the hole. I then repatched the tire and pumped it up. Not long later the air started to leak again with a "pssst". This time I was by the tire and it sounded like it's coming from the valve area. I'll be checking it shortly. I just wanted to find out about that rim rubbery thing and what that is called.
Thanks in advance.
03-27-07, 12:41 PM
That "rubbery surface" rim-tape is really not up to the job; they're usually fitted as a cheap substitute; what you should be using is "Velox" rim tape; set it and forget it! You know it makes sense!
03-27-07, 03:06 PM
"...the air started to leak again with a "pssst". This time I was by the tire and it sounded like it's coming from the valve area..."
On a "slower" leak, the air often vents NEXT to the valve stem.
03-27-07, 05:04 PM
The rubber rim strip is just that-- a "rim strip". Velox makes an adhesive-backed cloth rim-tape.
But WHAT is puncturing your tube? Is there something sharp on the inside of the rim? Is a spoke poking up through a nipple (spoke too long)? Is there something embedded in the rubber rim strip?
04-12-07, 08:34 PM
Sorry for the late reply. I checked and it's the rim tape that has a hole in it and the whole on the tube corresponds to the hole where the rim tape whole is. I ran my finger by the hole on the rim tape and did not feel any sharp object sticking out. My thinking is that the tube @80-82 PSI is squeezing through the hole in the rim tape and catching something. Thankfully I've not had any flats while under a load (while riding). My tires are 26"x1.75" Continential Travel Contacts rated for 80 PSI (tho some people have told me some newer models of Travel Contacts and Town & Country are rated at 85 PSI while thier website says something like 65PSI). I guess you pump up to whatever the PSI rating is printed on the tire then whatever the website tells you right?
Does anyone have a link to the manufactuer of this Velorx something rim tape? What is the best rim tape to date? One LBS said the best is nylon. The rim tape I have right now is 26" x 18mm and the taped area is where the valve hole is. The rim tape moves around freely/easy if you push it a bit.
04-12-07, 08:53 PM
The rim tape moves around freely/easy if you push it a bit.
…and will be moved by the tube as it inflates. As I said before, look around for some Velox™ (it has a tacky back, and so won't move), but it can be re-used. C'mon, you know it makes sense! ;)
PS: Here's a link (http://www.pricepoint.com/detail/11972-343_VELRT2-3-Parts-66-Rims/Velox-Cloth-Rim-Tape.htm) to start you off, good luck!
The problem is the hole in the rimstrip, get rid of it. Velox is available in various sizes to fit various rim widths. If you ride through water you may want to consider nylon rim tape. Velox is cotton and holds water longer, not good for rims, nipples, and spokes.
I use Velox on all rims but ride pavement only and not through water. An occasional rain shower probably won't matter.
04-12-07, 10:58 PM
Rim strips can vary in quality. Thick stuff works well for what it is, but if you want to be done with it, Rim strips are indeed better. Especially in Double-wall rim setups. Single wall rims it's not such a big deal, but with Double walls I try to use Rim Strips exculseively.
04-13-07, 12:54 AM
You also use some packing-tape instead of Velox or rubber rim-strips. This is the fibre-reinforced stuff and is quite strong. Also helps on mounting tight tyre/rim combinations due to its lower thickness than Velox or rubber rim-strips.
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