RSGulp

Firstly apologies to any UK Rennlisters who have seen the same posted on the PCGB forum (I'm just trying to get a wider opinion)...

I have the opportunity to buy some 18" wheels for my RS but not sure about whether they will be too big/issues with fit/offset.

I am currently using the original mag Cups which are:
Fr 7.5J x 17" ET55 Tyres: 205/50/17
Rr 9J x 17" ET55 (fitted with 18mm spacers to fill the arches) Tyres: 255/40/17

The new wheels are:
Fr 9J x 18" ET50 Tyres: 235/40/18
Rr 10J x 18" ET50 Tyres: 265/40/18

I am happy to change the tyres to a narrower size. I'm really checking to see if the rims would be okay for the car.

Any experience or advice would be much appreciated.

ilko

The 9" front wheels might be a bit too wide... The widest front wheel for a NB 964 I've seen is 8.5" but it also depends on the tires. Is there any way to test fit it?

The rear wheels & tires should fit in fine.

bart1

Those rears will be sticking out pretty far! I have 18x0 ET65 with 265s on my 993. Not sure I have 15mm more there...

I tell you what, send your RS over here and I will figure out exactly what will fit based on my 18s

Stefan964

The rears should work. I am driving on my RS 9,5x18 ET 47 with 5mm spacers (resulting in an effective ET 42) and there are still some Millimeters left to the fender.

I doubt that the front will work.
1) 235/40-18 may most probably cause rubbing
2) Even a 225/40-18 on a 9 inch rim is not the optimum
3) I would recomment 8x18 ET52 (maybe 8,5 x18 ET50) - a 9 inch rim is too big for the small 964 front.

Stefan

MortenKoch

I think the rear rims would be ok, but the tires would be too big in my opinion. I would think you need 265/35-18 instead of 265/40-18. With the current tire dimensions you have a larger tirediamenter (not sure what its called in english, but the distance all around the tire) in the rear thatn front.