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lang Forums Junkie Location: Adelaide Registered: June 2003	Re: why do worn tyres have no grip and slicks have lots? Thu, 25 March 2004 05:16 Norbie wrote on Thu, 25 March 2004 10:07 Yes it's mostly compound. Worn street tyres have no grip because the rubber has gone hard and crappy. Slicks are uber-soft and sticky, although they also become harder and less sticky as they wear. Note that in racing classes where street tyres must be used, it's common practice to grind most of the tread off new tyres; the rubber is still new so you have just as much grip, but the smaller tread blocks don't squirm around as much. As for the contact patch thing, the contact patch for any tyre is a function of only two factors: tyre pressure and weight. For a car with a given mass with a given tyre pressure, the surface area of the tyre's contact patch will be constant regardless of the tyre size. A wider tyre will change the shape of the contact patch (wider and shorter) but the surface area will remain the same. that still dosent explain why the worn down tyres i have have less grip than the ones with lots of tread left when they are all the same age.... and isnt a worn tyre with less gaps in the tread equivalent to a tyre that is wider? (not trying to be difficult, im just having trouble making sense of the whole thing) [Report message to a moderator]

	Subject	Poster	Date
	why do worn tyres have no grip and slicks have lots?	lang	Wed, 24 March 2004 09:19
	Re: why do worn tyres have no grip and slicks have lots?	thechuckster	Wed, 24 March 2004 09:30
	Re: why do worn tyres have no grip and slicks have lots?	lang	Wed, 24 March 2004 09:31
	Re: why do worn tyres have no grip and slicks have lots?	Classique71	Wed, 24 March 2004 09:38
	Re: why do worn tyres have no grip and slicks have lots?	lang	Wed, 24 March 2004 09:45
	Re: why do worn tyres have no grip and slicks have lots?	torque	Wed, 24 March 2004 10:56
	Re: why do worn tyres have no grip and slicks have lots?	Draza	Wed, 24 March 2004 12:37
	Re: why do worn tyres have no grip and slicks have lots?	Norbie	Thu, 25 March 2004 00:07
	Re: why do worn tyres have no grip and slicks have lots?	Youngy	Thu, 25 March 2004 01:46
	Re: why do worn tyres have no grip and slicks have lots?	lang	Thu, 25 March 2004 05:16
	Re: why do worn tyres have no grip and slicks have lots?	Norbie	Thu, 25 March 2004 06:46
	Re: why do worn tyres have no grip and slicks have lots?	lang	Thu, 25 March 2004 08:43
	Re: why do worn tyres have no grip and slicks have lots?	Mr DOHC	Thu, 25 March 2004 09:29
	Re: why do worn tyres have no grip and slicks have lots?	draven	Thu, 25 March 2004 01:53
	Re: why do worn tyres have no grip and slicks have lots?	rob_RA40	Thu, 25 March 2004 02:44
	Re: why do worn tyres have no grip and slicks have lots?	chrisss	Thu, 25 March 2004 03:11
	Re: why do worn tyres have no grip and slicks have lots?	draven	Thu, 25 March 2004 09:39
	Re: why do worn tyres have no grip and slicks have lots?	spectral	Thu, 25 March 2004 10:14
	Re: why do worn tyres have no grip and slicks have lots?	lang	Thu, 25 March 2004 10:31
	Re: why do worn tyres have no grip and slicks have lots?	torque	Thu, 25 March 2004 13:11
	Re: why do worn tyres have no grip and slicks have lots?	Mr DOHC	Fri, 26 March 2004 07:26
	Re: why do worn tyres have no grip and slicks have lots?	chrisss	Thu, 25 March 2004 15:04
	Re: why do worn tyres have no grip and slicks have lots?	lang	Thu, 25 March 2004 23:10
	Re: why do worn tyres have no grip and slicks have lots?	chrisss	Fri, 26 March 2004 08:02
	Re: why do worn tyres have no grip and slicks have lots?	lang	Sat, 27 March 2004 00:41
	Re: why do worn tyres have no grip and slicks have lots?	Farmsci ST162	Sun, 28 March 2004 13:52

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