Technical Tips > Post 84

C4 1990 Wheels & Tyres.

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Vettech:
Appears the 1990 year model has three OEM wheel configuration.

Std/Z51 -17 x 9.5 F&R with 275/40ZR-17 all round.

ZR-1  17x9.5 F and 17x11 R with 275/40ZR-17 Front & 315/35ZR-17 Rear.

Third style was the Callaway, a diff style alltogether, 9.5's with 275's all round..

My question is:
My 90 is not a ZR1, but has 315's on the rear, so if I go to the trouble of taking one off - is the wheel size embossed on the inside of the rim?
I know that HSV wheels do on the inside there is nill on the outside of mine..

Also OEM tyres were goodyears but there does not appear to be many suppliers of 315/35ZR-17
Nitto or Kumho do a 315, both do slicks, not much in the way of an all round tyre.

any ideas .....

Regards.

 s

bfit:
Yes should be
Bfit

Vettech:
OK - I'll whip one off tomorrow morning before I go out for G.M.

It's now tomorro. The 315 is a lot of rubber and must be the upper limit for 9.5" wheels.

See pic below.

bfit:
89/96 ZR1  ran P315/35ZR17  0n a 9.5’’ wide rim  . As the  engines of those years are low power version it does not cause any problems
Bfit

Vettech:
My info shows NO ZR1 for 89.

Avail wheels were:
Std/Z51 are 9.5's all round c/w 275's.
Callaway has a different wheel but still 9.5 and 275's all round.

1990 year first for ZR1 - series.
Std/Z51 and Callaway are all 9.5 c/w 275's

The ZR1 has 11" on the rear with 315's
In fact after looking at the sheets it appears that from its inception in 1990 the 11" wheels carried thru to 1996 for the ZR1.

All other styles (Callaway, Z51, Z52, Std, Grand Sport, 35th Anniv) had 9.5's on the rear as OEM equiped cars.

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