IMO, to some extent, you are _both_ right. Several areas in the TR6
suspension are marginal, as attested by the number of people that find
cracked/broken frame attachments. Certainly these cracks are caused by
stress (and a poor design unable to handle the stress), so more stress
(from wide, sticky tires and spirited driving) makes cracks (and eventual
breakage) more likely.
However, even cars that have always worn Redlines sometimes develop cracks,
so it seems like the question is not _if_ the stock mounts will crack, but
_when_.
As far as speed rating being an indicator of tire 'stickiness', it's true
they are not directly related. It's also true that generally, tires with a
higher speed rating are also 'stickier', simply because the same people
that buy high speed tires generally also want sticky tires. There are
certainly exceptions, especially when you start comparing relatively recent
tires (like the Yoko 510) to older tires (like the Michelin redlines).
There are also many tires that have different speed ratings in different
sizes (which makes sense when you consider that speed rating is related to
heat buildup, which is affected by size) even though the compound, tread
pattern, carcass construction, etc. are presumably similar.
BTW the Yoko 510 appears to be obsolete, at least in the US. Yoko no
longer lists it on their website.
Randall
On Thursday, June 10, 1999 8:21 AM, Philip Haldeman
[SMTP:haldeman@accessone.com] wrote:
>
> If you'll read my message, you'll notice I didn't refer specifically to
any
> particular tire or rating. I also referred to a "stock" suspension---not
> one set up for racing. I am not an expert, and merely passed along
> information from a very reliable source about the *potential* for very
> sticky, high-tech tires to cause problems with the stock suspension.
> Anyone else, more knowledgeable than I, is welcome to comment.
>
> Phil Haldeman
>
> -----Original Message-----
> From: Gernot Vonhoegen <gernot.vonhoegen@stir.ac.uk>
> To: triumphs@autox.team.net <triumphs@autox.team.net>; 'Philip Haldeman'
> <haldeman@accessone.com>
> Date: Thursday, June 10, 1999 6:33 AM
> Subject: RE: "S" rating on tires...
>
>
> >Excuse me?
> >I have seen a lot of racing TR6's with a lot stickier tyres than puny s
> >rated tyres. Apart from that does the rating of a tyre say absolutely
> >nothing about how sticky the rubber is. Compare yokohama 510's to
> michelin,
> >michelin last long, yokos don't yokos stick, michelins don't both ha ve
> the
> >same rating. The formulation in s rated tyres for 510's is the same as
the
> >one in the h rated ones.
> >Cheers, Gernot
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