Do I need a new tyre?

BroomWagon · Post by **BroomWagon** » Tue Jul 22, 2008 9:45 pm

And I believe it was developed during the Vietnam war to glue wounds together.

willhub · Post by **willhub** » Wed Jul 23, 2008 9:08 am

ClaireG wrote:Willhub: "I guess the superglue melts the rubber or something......"

Arthur: "Yup, it melts the rubber."

I feel it is my public duty to point out to our IT-acedemics that superglue does not 'melt' the rubber. Superglue forms very strong chemical bonds between the 2 exposed surfaces of rubber.
The cyano- chemistry is very clever; if you are that way inclined you could even 'google' it......

I hope you didn't breathe too much of the cyanoacrylate in, as on rare occasions it can cause asthma. But hey, then you could join all those other top athletes who take 'inhalers' to 'legitimately' enhance performance!.........

Here's to many more puncture-free rides on that tyre......

Well I checked where I superglued the hole, and this superglue cant have been very strong, after the sunday ride of 160 or so miles I got home to fine the damn glue had all gone!, the hole is back

, I never knew superglue canc ause asthma, dont matter though I think I still have that anyway.

BroomWagon wrote:And I believe it was developed during the Vietnam war to glue wounds together.

I'd have though they would of used stitches.

Arthur · Post by **Arthur** » Wed Jul 23, 2008 12:49 pm

Oh dear. Maybe leave it alone now and see how it goes.

willhub · Post by **willhub** » Wed Jul 23, 2008 1:42 pm

Maybe I could be abit creative and stitch it back together then actually get some rubber and actually melt it over!?

Arthur · Post by **Arthur** » Wed Jul 23, 2008 2:19 pm

If it's that bad, buy a new one.

willhub · Post by **willhub** » Wed Jul 23, 2008 2:42 pm

Its not that bad, I'm just thinking if dirt gets into it.

At cycle heaven one of the staff told me its like a million to 1 that I was get another puncture through the same hole, is that true? I thought it would be more prone to getting them now? :S

Arthur · Post by **Arthur** » Wed Jul 23, 2008 3:09 pm

If the hole isn't spreading and isn't big so big that the tube is spreading into it, then just leave it. Definitely don't start sewing.

Rob · Post by **Rob** » Wed Jul 23, 2008 4:31 pm

Arthur wrote:If the hole isn't spreading and isn't big so big that the tube is spreading into it, then just leave it. Definitely don't start sewing.

Or if you must sew it - let the air out first.

Tullio · Post by **Tullio** » Wed Jul 23, 2008 5:45 pm

At cycle heaven one of the staff told me its like a million to 1 that I was get another puncture through the same hole, is that true?

That's a fairly easy calculation Will. If you can supply the exact size of the hole, thickness left on the tread, average number of miles you travel, weight of your bike, your weight, rough number of flints per mile on the roads you use, make and model of the tyre so I can find out rubber density and compound--- I'll work it out for you.

willhub · Post by **willhub** » Wed Jul 23, 2008 9:35 pm

PaulC wrote:
At cycle heaven one of the staff told me its like a million to 1 that I was get another puncture through the same hole, is that true?
That's a fairly easy calculation Will. If you can supply the exact size of the hole, thickness left on the tread, average number of miles you travel, weight of your bike, your weight, rough number of flints per mile on the roads you use, make and model of the tyre so I can find out rubber density and compound--- I'll work it out for you.

Ok.

Average number of miles in a week I travel is around 300
Weight of my bike: about 10kg (estimate as it seems similar to my 10kg dumbell), maybe 8-9kg)
I weight 11.5stone
Flints per mile: hundreds, million maybe even billions?
Continental Ultra Sport
Thickness is like maybe 5mm
The hole is about 8mm long by 2mm wid.

Its only an estimate but I dont mind an estimate answer.

Tullio · Post by **Tullio** » Wed Jul 23, 2008 10:10 pm

Thanks Will. So long as you're happy with some margin of error, here is the result.

I forgot to ask about whether you are interested in dry or wet riding as there is quite a lubricating effect of water on flint. I've assumed 87% dry 13% wet. I also forgot to ask the age of your tyres as aging has a modulus effort on the compound, although it's negligable given your weight.

Roughly speaking you are 1.348 times more likely to suffer a puncture in that tyre over a 'new' tyre. Given that your other tyre will be somewhat degraded anyway that gap will narrow slightly. It's up to you but I'd live with that margin of difference and wait until the tyre deteriorates further either by aging or furher abrasion.

Incidently if you'd been riding Michelin Pro 2s you'd probably not have made it home as they deteriorate far quicker due to their 3.22mm sidewalls.

Hope that clears the matter up for you.

willhub · Post by **willhub** » Wed Jul 23, 2008 10:14 pm

Yes thanks thats made me much happier about using the tyre.

Are you a scientist or something that sounded complicated.

Rob · Post by **Rob** » Thu Jul 24, 2008 7:28 am

Paul, nice analysis. However you forgot to take into account the centripetal acceleration caused by the mass of the burger. Will, did it come with (like) chips.

R

PS. Will, "chips" is the old giffer term for "fries".

Willy H · Post by **Willy H** » Thu Jul 24, 2008 8:03 am

have a disconcerting feeling that this enlightening discussion about flints and cuts and rubber compounds and super-glue and moduli of elasticity and age-related deteriation of resilience is threatening to come to an end.

Allow me to attempt to inject new energy into the discussion by raising the subject of 'Flint Scrapers' (of yore). Where have they gone and why? Can they, and should they, be brought back/

Or is there a conspiracy by the cycle tyre and tube interests (not to mention the tubular and puncture repair industries) aimed at ensuring that these excellent anti-flint'n thorn gizmos remain museum pieces?

Or could it just be that they would n't look so cool on peoples' latest high-tech Pride and Joys?

I think Flint Scapers (of yore) would have gone down very well on last Saturday's ride, when the group colelcted between them around a dozen or more flats!

willhub · Post by **willhub** » Thu Jul 24, 2008 8:43 am

Flint scrapers are new to me I've never heard of them before, but I would not like them if they looked weird and also they proberbly would slow me down whatever they are. Sounds like they attach to the bike?

Rob wrote:Paul, nice analysis. However you forgot to take into account the centripetal acceleration caused by the mass of the burger. Will, did it come with (like) chips.

R

PS. Will, "chips" is the old giffer term for "fries".

Fries are those things you get from Mcdonalds and is the American word for chips no? I use chips. Yea it came with chips, butty and burger actually, also a dip with that stuff you put on burgers but I cant remember the name. It also came with an acid filled bottle of Fanta.