Johan Bornman Posted August 7, 2008 Share I wouldn't say the threads in the tyre do nothing and saying how a needle easily punctures the tyre is also irrelevant. Most punctures on our roads are due to glass. Glass pieces in general having tipss a lot larger than a pin head' date=' they would thus have to cut through some of the threads to puncture the tube. Thorns on the otherhand go through nearly anything no matter how hard or thick the rubber. I say this after having a thorn go through my gatorskin tyre with a tyre liner underneath and puncture the tube. This happened to me last week tuesday morning. This is a racing tyre with a 60tpi and the hole is big enough for me to fit my pinkie in. Pretty much I had a blow out while riding, where I can only gather that a piece of glass must've gut a small slit in the tyre and the pressure of tube on the tyre forced the threads in the tyre to tear with the tube bulging through and bursting. I doubt this would've happened if there was a 120tpi weave as I have seen on some of my older tyres where a piece of glass has cut a little slit where you can see the tube but it hasn't been able to force the tyre apart and come through.[/quote'] I hope you noticed my "just about zero" comment. I have no idea how close to zero that is since punctures as you point out are random and caused by different objects. My take on your analysis of your pucture is that the glass did all the cutting. Tyre pressure alone is not enough to break cords. A 120 TPI weave ironically, is weaker than a 60TPI weave. I posted a detailed explanation of weave and TPIs a week or so ago but the gist of it is that since the cords lie side by side, tightly packed, a 120 TPI weave's mat is thinner than a 60TPIs weave. Cords in 60TPIs are thicker and therefore less can fit into a given space. Puctures are are a bit like chaos theory and therefore for people to rate their tyres based on how many punctures they've had in the last year is dubious. I used to commute 60kms by bike and I can tell you that I got more punctures on Mondays than any other day. This was simply because on Mondays there was still a lot of glass on the road from the weekend's piss-upping and throwing bottles out car windows. By Tuesday it was reasonably safe and Friday morning the best. I can't vouch for Sunday and Saturday rides because then the roads are less busy and you can take avoiding action when you see a glass farm up ahead. However, this Sunday morning I rode down Ontdekkers in Roodepoort and passed a bar where glass was strewn right across the road over all three lanes. The music was still playing and the area was still stinking from beer, either the party was still going on or just starting again. It was a miracle that I didn't get a puncture here but I can't now go and say that the brand/model of tyre I had is bomb proof. I was lucky. Glass punctures incidentally, happen more on rear wheels than front wheels. Glass shards generally lie flat in the road and when the front wheel rides over them, they jump up and throw as sharp little middle finger at you, only to get embedded in your rear wheel. I make this point because I've had the argument that someone had two different tyres on his bike and the one had less punctures than the other and was therefore rated better. Puncture science is obscure. Link to comment Share on other sites More sharing options...
GoLefty!! Posted August 8, 2008 Share Silica filled rubbers are not banned in Europe. In fact Michelin and Continental are two manufacturers who own patents in the formulation of these fillers and Silicon based rubbers for motor vehicle tyre applications.the addition of the filler reduces rolling resistance and improves wet weather handling. It's the dye used in bicycle that is the problem, not the filler. Carbon black is a cheap filler. Tyres using carbon black as a filler is basically a sink for excess residues left over from refining processes and combustion of various hydrocarbons. Link to comment Share on other sites More sharing options...
GoLefty!! Posted August 8, 2008 Share The reason silica is not solely used as a filler is due to lack of conductiviy of Silica. Carbon black is a good conductor of electricity. while a car is moving there is a build up of static charge and that has to be earthed to prevent a discharge during re-fuelling. The Tyres are a good earth leakage, hence carbon black is still used in combination with silica. Link to comment Share on other sites More sharing options...
shaunh Posted August 8, 2008 Share Schwalbe Ultremo's together with the Ultremo tubes... Link to comment Share on other sites More sharing options...
Gman1834 Posted August 12, 2008 Share Race and train on Conti GP4000s Black chili Have about 6000km on them (half way about) and had two punctures so far. Not bad me reckons. I have also read that this tire should be quite good. I don?tcycle that fast so if I loose 20min changing a tire it would have a biggerimpact than loosing a few seconds every km. And the price also makes adifference. Please don?t discuss Punctures the week before the race?. After reading this post and even posted that my Gatorskinsare very reliable I GOT A FREAKING PUNCTURE in the Carousel race (3.5km intothe race). It was a long time trial. Ps I didn?t take 20mins to change the tire it took me 9:50. Link to comment Share on other sites More sharing options...
Spinnekop Posted August 12, 2008 Share didn?t take 20mins to change the tire it took me 9:50. My best time without the wheel change (Practicing at home.....ya.....ya....ja....I was single, living in Phalaborwa and had NOTHING to do......no Samajoor......I have already done that and then I had nothing to do) is 1 minute 50 seconds. Pumped to 8 bar (Gas). Link to comment Share on other sites More sharing options...
NotSoBigBen Posted August 12, 2008 Share Spidy did that include checking the tyre for 'goeters' properly ? Link to comment Share on other sites More sharing options...
javadude Posted August 12, 2008 Share I've got nice, fat 25c Gatorskins and recommend them highly. The 25c's require slightly lower pressure so they have a bit more comfy ride. I have yet to have a snakebite flat with them although i'm always on the lookout for potential punctures. They are really heavy but i'd rather have extra weight than lose time fixing punctures. Besides, thats why i spend a couple of extra grand on wheels to make up for the weight of my tires Link to comment Share on other sites More sharing options...
Gman1834 Posted August 12, 2008 Share didn?t take 20mins to change the tire it took me 9:50. My best time without the wheel change (Practicing at home.....ya.....ya....ja....I was single' date=' living in Phalaborwa and had NOTHING to do......no Samajoor......I have already done that and then I had nothing to do) is 1 minute 50 seconds. Pumped to 8 bar (Gas).[/quote'] Sjoe...Ek dink jy moet lesse gee.Die 9:50 is die totale stilstaan tyd volgens my gps. Link to comment Share on other sites More sharing options...
AndreZA Posted August 12, 2008 Share Myne is 5m37s met 'n plastic handpomp. Dit was 2003 Argus terug op die Blue route. Link to comment Share on other sites More sharing options...
Spinnekop Posted August 12, 2008 Share Gman1834 Jy is nie veronderstel om stil te staan en na die girls te kyk nie......pomp en kry klaar!!!!! Link to comment Share on other sites More sharing options...
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