RE: Wheel rate v. spring rate (was 17" wheels on an Ur-Q)...

[Eaton Dave <dave.eaton@minedu.govt.nz>]

and also increases the unsprung weight by a not-insignificant number of kgs
in each corner.

discussing this with an old rally buddy of mine who was talking to the guy
who recently won the regional rally in his wrc-spec subaru.  he was
discussing the pedant for uprating wheels and tyres on subaru's.  "if i had
my way they would sell them with anything but 15" wheels.  handle much
better that way."

makes you think.

dave
'95 rs2
'90 ur-q

	-----Original Message-----

	Date: Thu, 21 Jan 1999 09:41:25 EST
	From: JustaxPHX@aol.com
	Subject: Wheel rate v. spring rate (was 17" wheels on an Ur-Q)...

	Yesterday, while dashing off a quick reply about my experiences in
fitting
	8x17 wheels to my Ur-Q, I suggested that the resulting reduction in
track
	width caused by using a wheel with a 33mm offset as compared to the
OEM offset
	of 25mm would increase spring rates, among other things...

	Well, for the pedantic among you, I was wrong.  Actually, it doesn't
change
	the spring rate at all but it does increase the *wheel* rate, which
is the
	spring rate x motion ratio of the suspension.  Obviously, I know the
	difference and am guilty of using a shorthand reference that I
thought would
	make my point clearly, not of misunderstanding the very concept I
was trying
	to relate ... in future, I'll try to be more careful.