[Vwdiesel] Tire pressure
jhsg at sasktel.net
Fri Apr 14 17:52:20 EDT 2006
David Cook wrote:
> Tire technology has changed quite a bit since then
> (different types of tires, rubber compounds,
> durability, designs, maximum pressure range, etc), so
> tires you buy today are probably nothing like the
> tires that VW put on the car originally, which is what
> the specs in the doorpost come from.
Not really, Let me clarify something.
The tire pressure dictates the spring rate of the tire, and what the
suspension was designed to work with.
The tire is a big spring, and putting more or less air in it varies the
spring rate. It works in conjunction with the suspension springs that
were selected by the manufacturer, but changing tire pressures mostly
changes spring rate on that wheel, since radial tires are designed to
not change shape under pressure changes within a reasonable level.
99% of what you change with air pressure is ride comfort, and how well
the suspension sucks up the little bumps- because the tire is a
Advertising mavens would have you believe there are differences, but
other than radial tire technology that was introduced long ago, there
have been no significant changes other than rubber compounds and quieter
tread designs, which DO NOT affect suspension performance. For the most
part, sidewalls haven't changed much other than as fashion statements.
Sidewall height affects the spring rate significantly if you use tire
with minimal sidewalls (20" rubber bands)but on our cars, pretty much
aren't used, but from a suspension point of view are monumentally stupid.
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