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Posting-Version: version B 2.10.2 (Tek) 9/28/84 based on 9/17/84; site hammer.UUCP
Path: utzoo!watmath!clyde!burl!ulysses!bellcore!decvax!tektronix!orca!hammer!seifert
From: seifert@hammer.UUCP (Snoopy)
Newsgroups: net.auto.tech
Subject: Re: Yoko A008's
Message-ID: <1781@hammer.UUCP>
Date: Fri, 31-Jan-86 15:10:17 EST
Article-I.D.: hammer.1781
Posted: Fri Jan 31 15:10:17 1986
Date-Received: Sun, 2-Feb-86 01:14:10 EST
References: <1370@fisher.UUCP>
Reply-To: tekecs!doghouse.TEK!snoopy (Snoopy)
Distribution: net
Organization: The Daisy Hill Puppy Farm
Lines: 36
Keywords: slip angle  cornering  screeeeeech
Summary: race tires vs street tires

In article <1370@fisher.UUCP> bae@fisher.UUCP (Shiva the Destroyer) writes:

>	I am the owner of the '67 MGB mentioned in the previous review of
>these tires and I have but one thing to add:  these tires have no
>margin of safety on a light car!  I like to drive my car to the 
>limit, and I find that the Yokos demand a great deal more attention
>on my 1860lb. vehicle, because the transition between good grip and
>skid is catastrophic.  One minute you are cornering hard, the next 
>you are going backwards very quickly.  There are no warning signs
>before the transition.  No squeeling noises, no slight loss of
>traction, nothing. Unfortunately, this means that the limit of
>adhesion of your car has to be learned by experience :-) 

I doubt that this is due to the weight of your car so much as it is
a characteristic of the tires.  The A008 is a high performance tire,
and has different characteristics than "rim-protectors".  Plot
cornering force verses slip angle:

|      /\                               |
|     / |                               |
|    /  \                               |       /\
|   /   |                               |    --    --
|  /    \                               |   /        \
| /      \                              | --           --
|/        \                             |/                \
---------------------			---------------------

   Race tire                               Rim protector

The racing tire achieves more cornering power, but at a cost: once
you exceed the maximum, you lose traction FAST!  The rim-protector
doesn't achieve the wonderously high cornering force that the
racing tire does, but it is much more forgiving when you exceed the max.

Snoopy
tektronix!tekecs!doghouse.TEK!snoopy