Technical Tips > Brakes, Suspensions, Steering, Wheels & Tyres
1990 C4 Tyres
Vettech:
Been reading up, appears tyre rules world wide changed ~2000.
Tyres prior to 2000 can/maybe have a made date moulded into the side wall, but were hard to decipher.
From 2000 there is a string of codes ie "DOT XYZ ABC" then an oval cartouch with four numbers in it eg "4303"
This exact same number is on my front Pirreli's and indicates "43rd week of 2003" manufacture.
So the fronts are 15 years old - and here I was thinking they were not tooooo old.
The rears look really old, worn, cracking and have no code I can see, so me thinks they are ~19 years old.
Thanks MY081, the mustang had Pirrelis, as of today has four new ones - thru some deal she got thru work, but still dear.
Pirrelli's seem ok wet or dry but soft - she got 62,000 kms. (Manufacture date "0519" on these new ones).
Once upon a time you bought tyres and stored them to allow full cureing of the rubber, now a days they contain some rubber,
plastic, fabric, steel wires, polymids, silicon rocks, and only god knows what else, as a result it is now better to use them as fresh as possibl since they become hardened, ďevelope flat spots etc etc...
Tomorrow I'll sus out the shocks, they are bilstrin so are possibly OEM items, so could be up to 28yrs old.
.
MY081:
Yes uncle Doug the Pirreli's are soft (just what you need ) 62000 on the Mustang that sounds pretty good to me 37000 on Joy's car. Ray
Vettech:
Yeah the tyre fitter said it was good and shows the service people were doing the right thing.
Anyway on yesterdays Codgers run with 9 other Vettes, I spoke to Tim who runs Kumho's, said wet& dry ok, quite on the Hwy.
I think the chunky block tread Kumho is way to go, as someone said "if they fill the bill and are cheap - then get them, since you will never wear a set out".
Even though my fronts are Pirrelli, good tread, they are ~15yrs old. So maybe a full set all round 275/40ZR17's.
The shocks are Bilstein no sorry Bilstein/Delco, made in "WESTERN" Germany -the wall fell in ~89ish and East & West joined in 90.
Products were from then on stamped "made in Germany" or just plain "germany" ' DDR, GDR, East and West went out the door.
Removed RHF Wheel, cant get the shockies top nut off without destroying it, but got it far enough to turn it for the date, umm its pre 2000.
Also it can be easily pushed in, it does come back slowly.
So - a set of shockies are in order, when all this is done I might invite Bfit out for a weekend run from Kangaroo Valley over the back pass and into Berry, and then we will see how good his C6 goes.......this time.
Lefty:
Hi,
Would you get bilsteins again, or go with konis, or other?
Best
Lefty
bfit:
--- Quote from: Lefty on May 19, 2019, 05:43:47 AM ---Hi,
Would you get bilsteins again, or go with konis, or other?
Best
Lefty
--- End quote ---
Good question
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