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Old 10-22-06, 07:28 PM   #1
d_roche
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constant flats...that come back to life

hey all,

first off I'm new to the forums. good to be here. Seems to be plenty of info on this board, and looking forward to learning alot...

now, onto the thread topic.

i recently got a KHS Flite 500 (about 2 months ago) and ride it nearly ever day, save a few days here and there. I started to experience flats often, and figured it was the rim linings. i replaced those with some nice thick ones from Metro Bicycles, and everything was ok..

About 2 weeks ago i started to experience something strange.

I went to ride and found my back tire flat. I took it apart, went to find out where the whole was, but the tube pumped up just fine. I put it back in, and the tube held the air just fine. Come back a few hours later, flat.

Replaced tube, everything was fine for a while. Same thing just happened again, and agian the ube is not punctured or broken. It pumps right back up.

(The Flite 500 I have has Shimano R500 wheelset, Kenda Kontender tires, and Shimano Stainless 14g spokes)

any idea on what's going on here?
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Old 10-22-06, 07:31 PM   #2
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Have you tried to tighten the valve stem?
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Old 10-22-06, 07:34 PM   #3
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the valve stem is tightly secured with the o-ring...
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Old 10-22-06, 07:44 PM   #4
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Roughrider, these wheels take prestas, it can't be a loose valve core. Maybe a bad valve, but really unlikely. D-roche, he's talking about a problem that can happen with schrader (car-style) valves.

What you have are slow leaks from small holes. You could probably find them if you held the tube under water for a while, but that's a job for a pretty boring saturday afternoon to save yourself $7 worth of tubes. I'd replace your tubes, but in the process I would pull your tires all the way off, get something sharp (good sharp ice pick, file a nail to a thin point, stick a thick needle in a cork, whatever), and go over each tire very carefully looking for bits of glass embedded in the tread. It's a bit hard to describe, but you want to kind of pinch the tread and stick your probe in every little cut you see; probably about 1/3 of them will have little glass shards. It's that stuff slowly working its way through the tire that is making the little holes. Repeat this process every so often and you will get a lot less flats; since I started being dilligent about this my only flats have been from obvious causes (ran over the bottom of a beer bottle, caught a nail, etc...). Also, when you do flat out, never put in a new tube until you've found the culprit and removed it from your tire.

Also, you don't really need those O-rings, and installing them before the tire is at least partly filled can result in pinching the tube under the bead of the tire.
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Old 10-22-06, 07:49 PM   #5
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cheers landgolier...i'll check that out
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Old 10-22-06, 07:51 PM   #6
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you may have glass, a thin metal wire from a steel belted tire or a sharp rock embedded in your tire.

are you flatting in the same place? if so you need to check the tire in that area. if there are any holes probe around in them a punch pin or similar object to see if a sharp object is hidden in the rubber.

in the future align the tire label with the valve stem and thoroughly inspect the tire in the corresponding area for foreign object after each flat.

ed rader
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Old 10-22-06, 07:53 PM   #7
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are there any manufacturers who produce heavy duty road tires? i thought my girlfriend's father told me about them, but never gave me the website
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Old 10-22-06, 08:54 PM   #8
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bontrager race lite's. they make them in superhighultra puncture resistant tires. i have them on my commuter abd they are great. bout 40 bucks canadien a tire
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Old 10-22-06, 09:40 PM   #9
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thanks zephyr
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Old 10-23-06, 07:11 AM   #10
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Quote:
Originally Posted by zephyr15
bontrager race lite's. they make them in superhighultra puncture resistant tires. i have them on my commuter abd they are great. bout 40 bucks canadien a tire
More specifically, the tires zephyr refers to are Bontrager RaceLite Hardcase. I have them on my SS commuter and have had no probs with them.
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Old 10-23-06, 10:42 AM   #11
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i just came from the bike shop, where they trued my rear wheel. might this have been the cause of the flats?
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Old 10-23-06, 11:04 AM   #12
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and i've figured out the problem.

tire has a few VERY small holes in it...about 5. found a tiny piece of glass in one. damn.

should i just patch this tire up or invest in a better set?
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Old 10-23-06, 07:14 PM   #13
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Quote:
Originally Posted by d_roche
and i've figured out the problem.

tire has a few VERY small holes in it...about 5. found a tiny piece of glass in one. damn.

should i just patch this tire up or invest in a better set?
As long as you get the glass (or other debris) out of the tire, there's no reason to not continue to use it as is. Unless it's torn/gashed/ripped, which, from your description, is not the case.

Whether or not to replace the tire is more a matter of how much time you spend fixing flats (in which case you'll probably want something more puncture-resistant) vs. the cost of new tires. Untill the tire just wears out.
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Old 10-23-06, 10:04 PM   #14
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i picked up a little tire patch kit...i think it's actually for tubes (made by Bell), but I assumed I could use it on the inside of the tire...

i read some reviews on the Kenda Kontender. it shows very poorly. a few people had the same rear-tire-trouble that I've encountered. I'm thinking about picking up the Continental Grand Prix 4000 or Michelin Pro 2. I see most sizes of tires are 700x25...but the ones I have now are 700x26...will that mean new rims?
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