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Re: Redline Radial 215/60-15

To: smith007@mindspring.com
Subject: Re: Redline Radial 215/60-15
From: "Robert M. Lang" <lang@isis.mit.edu>
Date: Sat, 30 May 1998 09:09:49 -0400
Cc: triumphs@Autox.Team.Net
You wrote:

> My TR6,new suspension,sits really high! The new B.F. Goodrich Touring T/A's
> 205-65-15 look rediculous on the car, nowhere near fills the wheelwell.

Okay... this is what I've been trying to say to the list for a long time.

But there's more to it.

I'll presume that when you did the suspension, you replaced the springs
etc.? If not, ignore the next comment. Did you set all the suspension torque
settings correctly? Is the suspension "binding"?

There are several spring sets out there that are too tall (if used with the
wrong components). I noticed this quite a lot in TX at the '97 VTR. If you
combine too tall and stiffer springs, the car will never "settle" to the
correct ride hieght.

By way of example, my car has 520 pound springs in the back. Now, with all
things being equal (they aren't, but we're "explaining"), the car settles
about one inch when all the weight is put on the wheels. Now, if your stock
spring is say 10.9 inches and it compresses an inch, then the normal ride
hieght of the spring is something like 9.9 inches. That spring is rated at
something like 400 pounds (I think it's 390 pounds, but round figures are
okay here). Now, if you take a spring that's 520 pounds and 10.325
uncompressed height, when the weight is on the spring, it's ride height is
something like 9.75 inches - voila! The car is lowered. Now, if that same
520 pound spring is 11.25 inches free height, the compressed height is more
than 9.9 inches and the car is raised. In this case, you need to play with
the trailing arm swivel brackets to get things right.

Note: you can loose some ride height by getting rid of the rubber or
urethane "spring pad" thingies. I think the rubber ones account for up to
3/8 of an inch of ride height... I'll fill you in on this one too, if you care.

If you want more details on this, let me know.

Suffice to say, my car is around 1 inch lower than stock and the tires do
"fill the well", except I have 215/70-15.

Your 205/65-15's are about inch shorter overall height than the stock tires
were. This is a lot, and it translates to at least 5 percent of the tire hieght.

Oh, and are you using the stock TR6 5.5 inch wheels? This makes a difference
too.

> Even though I have seen TR's with 215-70-15's that look like there's just
> too much Tyre for the car, due to my TR sitting High , I have pretty muxh
> decided to go with the 215-65-15's? Question is can I find them in a
> Redline Radial?

Well, you can get them "red lined" if you wish, but I don't know of a red
line tire (as in Michelin X or other) that comes in that size.

Why don't you get another set of TR6 rims and leave the 205/65-15's on for
autocrossing??? Sorry, I can't resist the urge to get others involved.

The 215/65's will be much closer to the stock tire height than the 205/65's...

>   Phil Smith
>    69 TR6
>    " More Dreams Than Money "

Bob Lang
"More dreams than brains?"
;-)
TR6's


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