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Old 01-18-2011, 12:44 PM   #1
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Default Tire insert function

Guys,

This something that I always wanted to know, but never got a proper answer.
What is the real function of the insert in the tire regarding the hardness of it.
Let's say you have a hard compound with a hard insert and a hard compound with a soft insert, what is it going to bring to the car performance? Let's forget all the other car adjustments and consider the same track conditions.
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Old 01-18-2011, 01:52 PM   #2
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The different hardnesses mimic different air pressure.
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Old 01-18-2011, 02:01 PM   #3
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Quote:
Originally Posted by Fabricio View Post
Guys,

This something that I always wanted to know, but never got a proper answer.
What is the real function of the insert in the tire regarding the hardness of it.
Let's say you have a hard compound with a hard insert and a hard compound with a soft insert, what is it going to bring to the car performance? Let's forget all the other car adjustments and consider the same track conditions.

This article by David Jun is very informative.

http://www.tamiyausa.com/articles/fe...?article-id=13
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Old 01-18-2011, 02:08 PM   #4
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There isn't a straight forward answer as different inserts will give you different effects in different situations. One way you should look at inserts is as if they are shock absorbers as they do as much work as your shocks do.

What i tend to do is always run the hardest insert i can (for touring cars at least). At my local track same setup, tyres, wheels, track, everything except the inserts (sorex 28 Hards compared to mediums) i am 1/4 a second quicker on a 12 second lap with the hard's. Don't sound much but its potentially worth 5 laps and probably less mistakes. Reason why is the car feels more direct, reacts quicker, generates more heat in the tyres and generally feels more stable.

But if this wasn't my local track reasons for changing to a softer insert might be;
Bumpier conditions, overheating tyres, i might need to use a harder sharper setup in bumpier conditions, or i might just need a tyre that is more forgiving between high and low bite areas. Such as paint markings, tape, dust or blue groove.

To over simplify it a lot
Hard insert = More direct, sharper, bumpier and pushes the tyre into the ground harder.
Softer insert = Less direct, smoother, more forgiving and less likely to brake away suddenly.
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Old 01-18-2011, 03:38 PM   #5
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Guys, thanks a lot, it helped a lot, really.
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Old 01-18-2011, 03:56 PM   #6
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Click here for the Rubber Tires for Dummies Thread
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