New 18" wheels, but which tyres ?

[ChrisW]

OK, 17" Cup 2's ....

or, 18" Carreras

I know which I prefer !

 

[ChrisW]

ORIGINAL: frogisland Chris - what size tyre are you thinking of fitting to the wheels?  As i recall 235's are too wide for 7.5" fronts (235's are ok on 7.5" 17" wheels).  I have 2 set's of 8's and 9's made up from front 996/rear Boxster.  I have D01J's on one set and DZ02's on the other, 235/40/18 front 265/35/18 rear - the rear tyres also are better suited to 10", but the 9" suit my 968 better. JP

As an aside, I stand corrected, the fronts are 225/40 18's. Thanks []

 

[964rsdatabase]

Personally, i prefer the 17s. I love the combination of Maritime and black (but i would, wouldn't i). I think apart from the original Cups, the only wheels that look good on 964s are Speedlines (preferably gold ones).

 

[ChrisW]

Interestingly, I have a pic of 18" Speedlines on a 964 Cup car --- of which both mags and ali's were made, but I have never seen gold ? Do you mean the BBS E28 mags Martin ? Certainly the black with maritime works well --- as it does on your car [] But I do like the Carrera as a cheap, light, strong alternative ---

 

[jason]

ORIGINAL: sapex666 Personally, i prefer the 17s. I love the combination of Maritime and black (but i would, wouldn't i). I think apart from the original Cups, the only wheels that look good on 964s are Speedlines (preferably gold ones).

He's spot on.....cups, then speedlines

 

[964RS_DAB]

Chris I prefer the CUP wheels to the Carrera 18" rims, if you really want 18s on your NGT - I think split rim Speedlines is the only answer..... cheers David

 

[964rsdatabase]

Actually Chris, you're right. I meant BBS. A friend of mine has a brand new unused set that i am begging him to sell me but he is a bit of a hoader, so i don't think i'll ever get them. 18's, too! (and gold). Bling bling.

 

[ChrisW]

The Speedlines were certainly standard on the 964 Turbo --- and slightly different from the 993RS version speedlines. BBS do look fab, --- I had a set which are now with Matt for his Jurgen Altzen Turbo / Cup ' y car, definitely spot on for that. These BBS are going to be so easy to keep clean and will use the SO2's I have --- and give me a chance to try 18" wheels for myself. And I like 'em !! Shall I leave them on for Oulton ? Will it rain ??? Or will I throw the Cup2's back on with R888's --- or a manky set of Mags with PS Cups on !!! Life is too much fun [] The N-GT is in for MOT tomorrow so let's see what my mates at Strasse think ... But it's interesting, in playing, just how good the Cup 1's look []

 

[h_____]

I have to say the 17" wheels do it for me. Something about the 18" wheels just dont cut it for me. I do love the black, would consider getting a set of black wheels for mine at some point, All of that said, its your car if you like it - who cares?

 

[SimonExtreme]

ORIGINAL: Melv

ORIGINAL: ChrisW --- I recall 2 seconds but without knowing the track this is meaningless.

Three seconds at the Wiessach test track on a 964 Cup Car running slix, actually..[8|]

I have looked into this a little. From what I can make out, the switch to 18's was due to the availablity of suitable slick control tyres for the series. In a single car race class, it doesn't actually matter whether they ue 17's or 18's and the deciding factor was tyere availability. It has been sugested that the improved times were due to the tyres/compound rather than the change in wheel size. Looking at the benefit of 18's, the story is actually a bit mixed. The biggest benefit is that the tyre wall is smaller and therefore you get a stiffer tyre. This is not always beneficial, so matching wall stiffness to car is really important. I terms of weight, you need to look beyond just the unsprung weight. While unsprung weight is important (1 kg saved here is said to be equal to 10kgs of sprung weight), for the same weight the 18's usually have a greater moment of inertia, which effects braking and, to a much smaller extent, acceleration. However, all that being said, our cars aren't being developed so as to find the last 0.5% in performance so I think that there is little to be gained by going for 18's, other than personal preference wrt looks, or, maybe, if the tyres you want are easier to find/cheaper/ only available for 18's. There are also varous stories about 18's causing extra strain on the suspension that I have never got to the bottom of. Some say it only applies to race cars and is due to the use of slicks, others say that even with road tyres, 18's add significantly to suspension wear. I hope that is all as clear as mud!![]

 

[ChrisW]

Thanks Simon, really interesting. I used the car today on the 18" and my first impression is that the ride is stiffer, though not uncomfortably so. I wasn't that impressed with the SO2's to be honest, rather more lateral slip from the front before engaging the war --- and therefore less interesting squeezing the power on to bring the tail into play. Actually, the slip on turn in was quite noticeable. At the moment, it wouldn't surprise me if reasonably fresh R888's may not be better than the SO2's even in these conditions, though replicating the mud/moisture/temperature characteristics of any particular day is a rather random issue ! At the moment I would describe this combination as a little more "shiny" than "engaging" --- if that makes any sense.

 

[SimonExtreme]

Chris Are the SO2's new? If so, give it 3-500 miles. Every set I have used seems to change dramatically after that. I wonder if there is something in the manufacturing process that contaminates the first little bit of rubber.

 

[ChrisW]

The other way round, about four years old, but they've only done around 1500 miles. Maybe they just do need scuffing down a little on some dry roads. Maybe they are, literally, a little shiny ? I'll hang in there --- will Oulton be wet ??

 

[ChrisW]

Or how about this ? []

 

[964rsdatabase]

Much prefer the 18's on the Coral car, Chris. Slightly off topic, but i have been offered a set of 18 inch BBS split rims that were originally bought for a 964 turbo look cab. The guy thinks they are 8.5's and 10's. I know this question has been asked a thousand times before but will they fit my car? (Haven't got a clue about the offsets but i can probably find out) Cheers for any replies.

 

[chfs911]

8" and 10" fit fine et 52 and 61 with spacers. 18s are the size of choice for 64 drivers at Spa.

 

[ChrisW]

I had 8 and 9.5 E28's on a 964RS without spacers --- and could never find any offsets on them. Why not try them ? That's what we did with Matt's car and they fitted very well (Turbo bodied with some different bits .. ??) Strangely, the magnesium Speedlines fitted to the 993Cup cars were 10" rear and 8.5" fronts ...