Glass pieces in tyres

[KevinV]

Continental Gatorskinz!!!!!!

Had more punctures than ANY other tyre with those. Threw them away.

[Canaris]

fung shui tyres work best against glass, but are a real pain in the corner.

[Johan Bornman]

Puncture protection on bicycle tyres is purely a function of the casing thickness. The more rubber on there, the longer it'll take for a piece of glass to work through and the bigger chance of it falling out before it works its way through.

Glass punctures are almost always caused by tiny pieces of glass that are just-just smaller than the casing is thick. It works its way into the casing by each revolution of the wheel. Whilst it is still not all the way in, it has a good chance of coming out. But once it is inside, it'll stay there until the tweezer takes it out.

Modern bicycle tyres are primarily designed for low weight and low rolling resistance - both these attributes take any meaningful puncture protection out of the equation.

The strength of the fibre used to weave the casing has very little to do with puncture protection and labels like Kevlar, Gator, Mamba, Crocodile Hide, Dikvel, Aramid, Superstrong, Tough etc have very little bearing on the protection the casing offers. This is because a casing is like a basket, with an open weave and sharp objects simply work their way past the fibres into the tube. If you don't believe me, make yourself a strong mat from kitchen steel wool (stronger than Kevlar) and spread it out on your thigh. Now perform a powerful stab with an ice-pick, needle or dagger onto the protective mat. Report your findings here, with photos please.

Wet roads statistically create more punctures than dry - water is an excellent lubricant and helps the glass cut through the rubber like the proverbial hot knife though butter. Also, water disguises patches of crunched up glass and you tend to not avoid it 'cause you can't see it.

Punctures are things of luck. Sometimes you are lucky, sometimes not. Ride long enough and you'll have long periods of luck and bad luck.

Statistically Fridays are luckier than Mondays. There's good science behind that stat. On Mondays you are riding through the crunched-up glass chucked out of car windows during drunken trips home. By Friday most of it is very fine and harmless. Mondays are more puncture prone.

Murphy also plays a role here. Expensive tyres seem to attract more punctures than cheap ones. No reason other than Murphy's law.

Cheap and expensive tyres (within reason now) all have tyres with rubber equally hard or soft, as far as glass goes. There is no tyre rubber than is more resistant to cuts than another tyre rubber. The two types of rubber - fortified with carbon black (tyre can only be black) or those fortified with silica sand, which can be any colour. Although the carbon rubber lasts much longer than the silica rubber, it is equally prone to punctures.

Punctures are part and parcel of road cycling. Live with it.

Johan Bornman2009-03-31 06:15:07

[Kranswurm]

Puncture protection on bicycle tyres is purely a function of the casing thickness. The more rubber on there' date=' the longer it'll take for a piece of glass to work through and the bigger chance of it falling out before it works through.

Glass punctures are almost always caused by tiny pieces of glass that are just-just smaller than the casing is thick. It works its way into the casing by each revolution of the wheel. Whilst it is still not all the way in, it has a good chance of coming out. But once it is inside, it'll stay there until the tweezer takes it out.

Modern bicycle tyres are primarily designed for low weight and low rolling resistance - both these attributes take any meaningful make puncture protection out of the equation.

The strength of the fibre used to weave the casing has very little to do with puncture protection and labels like Kevlar, Gator, Mamba, Crocodile Hide, Dikvel, Aramid, Superstrong, Tough etc have very little bearing on the protection the casing offers. This is because a casing is like a basket, with an open weave and sharp objects simply work their way past the fibres into the tube. If you don't believe me, make yourself a strong mat from steel wool (stronger than Kevlar) and put it on your thigh. Now perform a powerful stab with an ice-pick, needle or dagger onto the protective mat. Report your findings here, with photos please.

Wet roads statistically create more punctures than dry - water is an excellent lubricant and makes the glass cut through the rubber like the proverbial hot knife though butter. Also, water disguises patches of crunched up glass and you tend to not avoid it 'cause you can't see it.

Punctures are think of luck. Sometimes you are lucky, sometimes not. Ride long enough and you'll have long periods of luck and bad luck.

Statistically Fridays are luckier than Mondays. There's good science behind that stat. On Mondays you are riding through the crunched-up glass chucked out of car windows during drunken trips home. By Friday most of it is very fine and harmless. Mondays are more puncture prone.

Murphy also plays a role here. Expensive tyres seem to attract more punctures than cheap ones. No reason other than Murphy's law.

Cheap and expensive tyres (within reason now) all have tyres with rubber equally hard or soft, as far as glass goes. There is no tyre rubber than is more resistant to cuts than another tyre rubber. The two types of rubber - fortified with carbon black (tyre can only be black) or those fortified with silica sand, which can be any colour. Although the carbon rubber lasts much longer than the silica rubber, it is equally prone to punctures.

Punctures are part and parcel of road cycling. Live with it.

[/quote']

 

I think that was one of your better efforts.A real work of art.I mean it

[Johan Bornman]

Thanks Wurm. I spotted two funnies in there and edited it for clarity.