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Tyre Durometer


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#1 kart.68

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Posted 14 July 2017 - 08:07 AM

After a tyre Durometer for rubber foam tyres to buy our lease for the weekend 22/7/2017, our where I can get one other than the USA.

#2 kalbfellp

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Posted 14 July 2017 - 08:50 AM

Durometers are available from Scientific Equipment suppliers. You will need one with a balled needle end.
I have one for Shore A but that will not measure soft foam.
The small diameter of slot car tyres makes them difficult to measure, so you will need a curved adapter of similar size to the tyres.

#3 sticks

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Posted 14 July 2017 - 08:56 AM

You are going to test foam tyres for hardness! <_<
Good luck

#4 Caddo

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Posted 14 July 2017 - 09:41 PM

Foam tyres are very treatable, don't like them much. Most run goo with foam, is duro significant?

#5 kalbfellp

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Posted 14 July 2017 - 11:25 PM

The Durometer of foam tyres is only a very small part of the spec.
The pourosity and actual composition of the foam are more important IMO.


#6 munter

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Posted 15 July 2017 - 06:57 AM

Quote

is duro significant?
it is for serious metal chassis racers
John Warren
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#7 kart.68

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Posted 15 July 2017 - 07:45 AM

Hi. Yes for metal chassis to check if tyre treatments softens foams enough to get a reading.

#8 kart.68

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Posted 15 July 2017 - 07:50 AM

View PostCaddo, on 14 July 2017 - 09:41 PM, said:

Foam tyres are very treatable, don't like them much. Most run goo with foam, is duro significant?
Hi, at the track I race no goo allowed no tyre treatment allowed, only tape shellite lighter fluid allowed a racer was using scaleauto slot grip tyre cleaner.

#9 kalbfellp

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Posted 15 July 2017 - 08:05 AM

Tyre treatment used on foam does not soften the foam, it penetrates into the foam to aid grip.

#10 Garry J

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Posted 17 July 2017 - 08:48 AM

I've had this for many years, can't remember where I got it. Is very accurate if used in a consistent way but you have to remember that the readings don't relate to any other device or tables, they're only relative to your device.

Posted Image

I found this one within about a minute on Google, pity no Oz shipping but there are others out there - https://www.amazon.c...rometer+shore+a
Cheers,

Garry J


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#11 kalbfellp

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Posted 17 July 2017 - 11:41 AM

For foam tyres you need a OO Durometer for accurate readings, foam are right at the bottom end of Shore A or below.


#12 chenglaw

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Posted 17 July 2017 - 04:34 PM

Quite honestly, if you are hosting a race, is it worth the trouble to specify the Shore Hardness of the tyres used? As I see it, it just adds to the complexity of policing the rules, a cumbersome specification requirement which race organisers do not need. We now have differentiation between Rubber, Urethane, Silicone and Sponge/Foam tyres which thus far have been quite easy to separate visually, so why make things difficult for yourself?
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#13 shadow_rusty

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Posted 17 July 2017 - 04:56 PM

The issue here is that tyre treatments can significantly increase the tyres grip.
We are all running the same tyres, but we are trying to make sure that it's a level playing field with no 'cheating'.

Hand out tyres / motors are the best way to resolve this, but they also create a significantly more complex and expensive event.


Oh, and an 'O' durometer is easy to get, but an 'OO' is much harder / expensive...

Edited by shadow_rusty, 17 July 2017 - 05:10 PM.

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#14 chenglaw

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Posted 17 July 2017 - 05:17 PM

So how do you intend to resolve any disputes on the shore hardness when an entrant's car is shod with tyres which he has measured with another durometer which gives a result different to the one which the race organiser is using?
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#15 kart.68

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Posted 17 July 2017 - 05:18 PM

As Phil said hard to test for tyre treatment with out a tyre sniffer like we used in the 90's in Go Kart Racing is hard, we can only hope all will be honest and not cheat.

#16 shadow_rusty

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Posted 17 July 2017 - 05:33 PM

Reality is that it's easy to 'cheat' the system no matter what tools are used.
Some sunscreen lotions can, and are used, for treating foam tyres.

No, I don't believe that we will have a durometer in use for the enduro this weekend, but, suspect tyres will be checked / banned if they are believed to be contaminated...
This will not be a decision taken lightly by just 1 person. It will have to be unanimous decision with several key players including a minimum of the host and the head scrutineer for any action to be taken.

Also, given that 'most' treatments are only truely effective for 20 laps, their effectiveness is reduced in an enduro anyway,
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#17 chenglaw

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Posted 17 July 2017 - 05:51 PM

"No, I don't believe that we will have a durometer in use for the enduro this weekend, but, suspect tyres will be checked / banned if they are believed to be contaminated...
This will not be a decision taken lightly by just 1 person. It will have to be
unanimous decision with several key players including a minimum of the host and the head scrutineer for any action to be taken.

Also, given that 'most' treatments are only truely effective for 20 laps, their effectiveness is reduced in an enduro anyway,"

Yeah, I believe that is a more realistic approach as you can usually smell/feel any addictive on the tyres. I can remember during my 1/24th raceway days back in the 60's, we used to rub in "goo" to our sponge tyres just before the start of our heat and they would be just about worn off by the end of a 30-lap race.
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#18 sticks

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Posted 17 July 2017 - 09:43 PM

View Postshadow_rusty, on 17 July 2017 - 05:33 PM, said:

Reality is that it's easy to 'cheat' the system no matter what tools are used.
Some sunscreen lotions can, and are used, for treating foam tyres.

No, I don't believe that we will have a durometer in use for the enduro this weekend, but, suspect tyres will be checked / banned if they are believed to be contaminated...
This will not be a decision taken lightly by just 1 person. It will have to be unanimous decision with several key players including a minimum of the host and the head scrutineer for any action to be taken.

Also, given that 'most' treatments are only truely effective for 20 laps, their effectiveness is reduced in an enduro anyway,

I find this hard to believe you can ban a set of tyres based on,(smell and feel) ? :huh: :huh:
There is no mention of tyre hardness in the rules!

And if what you say about tyre treatments only lasting 20 laps is true, you may save (say) about 0.3sec a lap X 20 = 6sec

A good lap time is about 5.2sec

you save about 1.2laps in an event that will go for about 1450 laps

I don't think its worth the worry

#19 kalbfellp

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Posted 17 July 2017 - 09:55 PM

One solution would be for each Entrant prepare a set of tyres and then put them into a pool and then draw them at random foe each car.

#20 espsix

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Posted 17 July 2017 - 11:53 PM

Or just clean all entrants tyres with shelite right before Parc ferme, or during tech inspection.





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