944 Turbo - Alternative Porsche Wheels

[Penguinracer]

I'm after some advice about what other Porsche wheels can be used on a 1990 944 turbo without wing clearance issues.

The standard wheel tyre combo is:

Front: 225/50/16 16 x 7J O/S 65mm Diameter= 631 mm

Rear: 245/45/16 16 x 9J O/S 60mm Diameter= 624 mm

I'm planning to upgrade the brakes to "Big Blacks" (993 Turbo calipher mounted behind the disk) so I'll need at least 17" wheels. I'm going to upgrade all the suspension but aim to retain a close to standard ride height.

I'm wondering what Porsche wheels & tyres will fit? I like the Cup II wheels but I'm concerned about the offset of some of the other Porsche wheels.

Running a conversion these seem to be the tyre size options:

Standard Front 225/50/16 diameter = 631mm
225/45/17 diameter = 636mm
225/40/18 diameter = 636mm


Standard Rear 245/45/16 diameter = 624mm
245/40/17 diameter = 628mm
245/35/18 diameter = 629mm

I don't want to have tyres that are too wide as I don't want stonechip & wing clearance issues. I'm keen to run Formula R rubber as this car will spend some time at the track, especially the 'Ring.

Any advice from you 968 & 944 pilots?

[PH5121]

When I had a 944S2 it initially had 993 17 inch Cup 2 wheels, which needed thin spacers on the front to correct the offset.
The car later had 18 inch 993 RS style wheels (I don't know the widths of the top off my head)which fit fine, I made front mud flaps to prevent stone chips on the sills and rear wings.

[Penguinracer]

Thanks for the info. Which set of wheels worked better?
Were there any clearance issues with the 18s?
I understand that the rear 18s are 10" wide - but the offset wasn't an issue?
Ideally I'd like to avoid spacers.
I suppose choice also comes down which wheel size is supported by a wider range of Formual R tyres - 225s & 245s are at the narrower end of availability for 18" wheels I'd have thought.

I thought I saw a reference to Renn68 running 255s on the front - but his car may be much modified.