In reply to a message from Kevin Campbell sent Sun 24 Apr 2005:
There’s no question that the Jag-spec P4000 is different from
normal - I just can’t recall exactly why, and what the suffix is
which denotes the correct spec. Might be a J or an E or something.
I’m almost 100% certain the difference is in the number of plies
but whether it’s the sidewall or the tread belt plies I also can’t
recall. I ‘think’ but am not 100% certain, that the Jag-spec P6000
is also different from that for other cars.
Which is not to say that a box-stock P4000 or P6000 won’t work fine
most of the time and many people wouldn’t notice the difference.
But for anyone looking for the ultimate level of achievable
refinement over bumps, then it pays to go with what the factory
testers developed for the car. Apart from anything, as has been
pointed out, it’s a whole lot easier and cheaper than replacing all
the suspension hardware in sequence… Once you have the right
tyre, drop the pressure to the low end of the recommended range to
suit your requirements and you’re well on the way to that elusive
magic carpet ride. For any hard / fast trips put a bit more air in
and drive safely on the firmer ride until it’s cruising time again
at the lower pressures.–
Peter Crespin 94 X300 Daimler / 66 2+2 ‘E’
Buxton, United Kingdom
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