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Old 09-19-2002, 10:18 AM   #1
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Default What does shore mean?

Anyone have an answer for this
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Old 09-19-2002, 10:43 AM   #2
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"Shore" is another word for "hardness" when refering to tyres.

Example - 30 shore, 40 shore, 50 shore etc etc...

The lower the shore the softer the tyre. The higher the shore to harder the tyre.

Example - 35 shore tyres are softer then 40 shore tyres.
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Old 09-19-2002, 11:50 AM   #3
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Default Re: What does shore mean?

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Originally posted by VONEREFLEXR
Anyone have an answer for this
Shore (or Durometer) test is the measurement of the resistance of the rubbers/elastomers toward indentation. It has two scales, Shore A and Shore D. Shore A is usually used to measure softer materials, like foam and rubber tires used in R/C cars.

Note that the measurememt will change over time or if the material being measured has changed in thickness. A brand new tire will have a higher reading if you measure it again three months later or after 20 laps (3 laps at Revelation ).
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Old 09-19-2002, 12:01 PM   #4
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thanks for all the wonderful information, Sir!
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Old 09-19-2002, 12:43 PM   #5
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Default Re: Re: What does shore mean?

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Originally posted by Data


Shore (or Durometer) test is the measurement of the resistance of the rubbers/elastomers toward indentation. It has two scales, Shore A and Shore D. Shore A is usually used to measure softer materials, like foam and rubber tires used in R/C cars.

Note that the measurememt will change over time or if the material being measured has changed in thickness. A brand new tire will have a higher reading if you measure it again three months later or after 20 laps (3 laps at Revelation ).
Great info

Here is a question you might be able to answer : Why are a set of tyres that come out of a box brand new never the same shore as rated on the box? Is it because over time the tyres will have changed readings (as you mentioned above) or is it because of the different techniques/durometers used when measuring the tyres?

Question 2:

If you do have two identical 40 shore tyres both 60mm and both brand new. You true one down to 55mm and the other down to say 58mm - will the shore ratings now change for each tyre? -In other words, the 55mm tyre will actually have a higher rating (harder) then the 58mm tyre?
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Old 09-19-2002, 02:42 PM   #6
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Shore - The land along the edge of an ocean, sea, lake, or river; a coast.

Land; country. Often used in the plural: far from our native shores.

Land as opposed to water: a sailor with an assignment on shore.

LoL.....J/K..just trying to add some humor to this post
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Old 09-19-2002, 03:31 PM   #7
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Default Re: Re: Re: What does shore mean?

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Originally posted by Novarossi


Great info

Here is a question you might be able to answer : Why are a set of tyres that come out of a box brand new never the same shore as rated on the box? Is it because over time the tyres will have changed readings (as you mentioned above) or is it because of the different techniques/durometers used when measuring the tyres?

Question 2:

If you do have two identical 40 shore tyres both 60mm and both brand new. You true one down to 55mm and the other down to say 58mm - will the shore ratings now change for each tyre? -In other words, the 55mm tyre will actually have a higher rating (harder) then the 58mm tyre?
I guess the rating on the box applies to the foam material before they were turned into tires. When a manufacturer rate the material, they would follow the guidelines per ASTM standards. Meaning they would obtain a specimen from the batch with specific dimensions (usually a square/rectangular block or disc with a certain thickness) and tests the specimen under a specific condition/method per the standard. This specimen, I am sure, does not have the same shape and sizes as the foam tires one took out from the box.

A thin (about 7mm), curved piece of foam, reinforced by a semi-rigid plastic (the rim) would have a different reading from the specimen that was tested by the manufacturer even if it is the same material. The reading can also be affected greatly by how the material is able to deform under stress. Notice the readings between the center of the tire and the edges of the tire are different? At the center, the foam could and would deform in all directions, at the edges, the deformation is limited to one side.

I would expect the 55mm tier to have a higher reading when tested at the same spot because it has less material to deform and is closer to the reinforcing rim.

Shore rating gives an idea of relative resilience of various grades of rubber/foam but it does not give any information on properties like wear or abrasion and they could be different between manufacturer even if the Shore rating is the same. I wouldn’t worry too much about this Shore rating thing and I don’t understand why the manufacturer even bother to put it on the box since it is really meaningless to us. A simple “Really Really Hard”, “Really Hard”, “Medium”, “Really Soft”, “Really Really Soft” rating should suffice, my opinion anyway....
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Old 09-19-2002, 03:38 PM   #8
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Quote:
Originally posted by ME-student
thanks for all the wonderful information, Sir!

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Old 09-19-2002, 04:15 PM   #9
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I thought that the possibility of getting a tire with the spec shore rating, would depend on how much effort the manufacturer put into grading. From my understanding, foam tires regardless what their shore rating, start life as a single sheet of foam where different sections of the foam are different in hardness. The sections are then cut to accordance and graded and regraded. If you have a good manufacturer such a GRP, they will grade 2 or 3 times before a shore rating on a tire is cement. Grading isn't perfect but the more you do it, the better your chances are at maintaining consistency in tire wear and grip. You would have to spend an arm and a leg for tires that are the shore rating listed on the package because the manufacturer would have to throw away the tires that didn't have the correct shore rating.
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Old 09-24-2002, 09:33 AM   #10
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That is right - they measure when it's a sheet, not on the rims.

Part of the reason for the variance is that the rubber manufacturers don't have that much precision in their manuf process - Jaco's supplier doesn't have 40 shore (C) rubber, they have 38-50 shore (C), so what he does is he finds areas on the sheet (48" square) that are the grades that he wants for each rating of tire. Some will be Ppl, some will be Double Ppl, etc.

Jaco uses the C rating of Shore since that's what he gets from his supplier.
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