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Sebba
Original Poster
32 posts
42 months
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Hi guys,
I have a 964 cab currently running on 18's - which gives the car a pretty horrid ride...
I got my hands on some 17 cup1 alloys which i want to put on the car to bring it back to standard...I am told the offsets are right...
But the thing is the front tyres are shot and need replacing so I think I have decided to go with Bridgestone S02 but am also considering the Michelin SP2's - any thoughts?>
But my main question is on the sizes - I want to run with the following confirguration - 225-45-17 & 255-40-17 in the back when I eventually come to change them (I think it has those sizes on now) so my main questions are:
i) is that the best confirguration to run
ii) will 225's fit in the front (I think my car is pretty standard) - i am hoping to take the car to centre gravity to get the set up right...but i need to get the wheels on first..
Thanks for your guys help!!
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h_____
513 posts
93 months
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Should be fine, I've run those sizes on mine. Can you still get SO2s?
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EdM
123 posts
42 months
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17 inch wheels as big as you can go to be comfortable...18's look right and are tempting given the choice of alloys but these are for later models, 993 onwards but ultimately ruin the ride of the 964..
Bridgestone SO2's prob the best all-round tyre you can put on them, I did try Conti sports and they gave an immediate and significant improvement over the old tired tyres - which if I rememeber were originally Pirellis when I bought the car but the Contis whilst good value at the time, soon dropped of their best and needed replacing, notably at the rear, in an alarmingly short time...
take your time...good tyres/wheel size, tracking etc make a surprising difference at the wheel..
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mr pg
720 posts
74 months
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I think that is the standard sizes you quote for 17's, so no problem. You could try Continentals too, as they are a popular fit on 964's.
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barchetta_boy
1,012 posts
101 months
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Got Mich PS2s on mine and they are great; having said that I have never approached the limit of adhesion in the'64...
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thegoose
6,599 posts
79 months
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SO2's are very good. I think that the front size is normally 205/50. I used to race on these (on 8" rims) and the car never seemed to lack front grip. Maybe if we'd been allowed wider tyres I'd have tried them but this wasn't an option. You may also find that 225's rub the wheelarch liners a little when on full lock.
It's all down to set-up. I'd suggest going to someone that knows the model well and can be trusted to set it up properly (and safely), ideally with motorsport experience. For a 964 top of the list would be Danny@ Unit 11 and Robin @ Ninemeister, but I'd be confident with a few others too: Sports & Classic, Hartech, Paragon, County Classics, Ninex, depends where you are in the country really.
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computamedic
286 posts
102 months
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It depends more on the WIDTH of the wheel rather than the diameter. The more common Cup 1s on the 964 were 7J on the front and 9J on the rear. A 225/45x17 is NOT recommended for a 7J wheel. h___ is OK because he has a 964RS which has a 7.5J front wheel and the 225/45 is fine on that. I'm pretty sure a 205 is the max recommended for a 7J/17 although there are some tyre manufacturers that OK it - but Porsche never has AFAIK.
Dave
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ras62
262 posts
25 months
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mr pg said: I think that is the standard sizes you quote for 17's, so no problem. You could try Continentals too, as they are a popular fit on 964's. Standard on the front is 205/50. Bigger is not always better, the car will ride and steer better with 205 as opposed to the 225 suggested.
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boxsey
1,646 posts
79 months
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computamedic said: It depends more on the WIDTH of the wheel rather than the diameter. The more common Cup 1s on the 964 were 7J on the front and 9J on the rear. A 225/45x17 is NOT recommended for a 7J wheel. h___ is OK because he has a 964RS which has a 7.5J front wheel and the 225/45 is fine on that. I'm pretty sure a 205 is the max recommended for a 7J/17 although there are some tyre manufacturers that OK it - but Porsche never has AFAIK.
Dave Dave, 986 Boxster 16 inch rear wheels are 7J and have 225 width tyres fitted as standard. Steve
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Mr_Simpson
33 posts
83 months
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Bought a 964 recently myself, I like to research these things...
I've read the best overall tyres are Continental Contact Sport 2's.
The right size for Cup1's are 205/50 ZR17 on the front and 255/40 ZR17 on the rears.
Hope that helps.
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freedman
4,075 posts
76 months
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Mr_Simpson said: Bought a 964 recently myself, I like to research these things...
I've read the best overall tyres are Continental Contact Sport 2's.
The right size for Cup1's are 205/50 ZR17 on the front and 255/40 ZR17 on the rears.
Hope that helps. 205s are for 7in fronts 7.5 in fronts, that are on the RS and most replicas need 225's
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mr pg
720 posts
74 months
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ras62 said: Standard on the front is 205/50. Bigger is not always better, the car will ride and steer better with 205 as opposed to the 225 suggested. The old memory's not what it was!
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SalesManager
2,179 posts
109 months
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205 50 all the way. 225/24 will not be as comfortable (marginal) and for what in terms of performance?
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computamedic
286 posts
102 months
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boxsey said: Dave, 986 Boxster 16 inch rear wheels are 7J and have 225 width tyres fitted as standard.
Steve Steve, You can't read too much into that because the 16" wheel will use a higher profile tyre so whereas the fitting for a 17" would be 225/45, the 16" wheel would use a 225/50. The different characteristics of the additional sidewall height would alter the behaviour of the tyre vs rim fitment. The risk of the 225 tyre on a 17x7J rim is that the tyre would not flexing enough under cornering and potentially unseat itself from the bead. A slightly wider wheel gives the tyre a stronger, more stable base and allows less flex of the sidewall. That's my understanding of the problem. Curiously, my VW Golf runs 225/45 on 17" 7J wheels from the factory but everything I have read from Porsche/Michelin poo poos the idea. Dave [Edited to correct tyre profiles}
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Jamie Summers
171 posts
120 months
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There is pretty significant variation between the actual widths of different manufacturer's 225 tyres. I have and still do run 225s on 7" rims. This was on a regular 964 C2 and my current 964 RS (yes I know the mags are 7.5", but I also have standard 7" Cup 1s and 7" BBS). In both cases the arches had been rolled, and there is some sign of historic contact between tyre and arch-liner. The main area to look for contact is the point at which the PU meets the wing inside the arch. Porsche themselves approved a modification to grind back the plastic a bit in this area to create more clearance.
I have had no problems with this set-up and will continue to use it dependent upon tyre availability.
Jamie
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boxsey
1,646 posts
79 months
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SalesManager said: 205 50 all the way. 225/24 will not be as comfortable (marginal) and for what in terms of performance? I (and others) use the 225 on the front for track tyres. The main benefit being to help reduce understeer when pushing the car hard on track. A second reason being that the track tyres used by many of us are Toyo R888s which are not available as a 205/50 in 17 inch sizes. Therefore we use the 225/45 because it maintains a similar rolling radius to a 205/50. I agree that the 225 is not much of a benefit for road use and therefore I stick to 205/50 for my road wheels. 
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barchetta_boy
1,012 posts
101 months
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I wouldn't get too hung up on whether a 225 tyre will fit on a 7J rim - the original 928 came from the factory with 7J wheels and 225/50/16 rubber all round. The GTS came with a 7.5J front and the GT with an 8J front: both took 225 section tyres.
What's more relevant is how the extra tyre width will affect steering and handling and possible rubbing. I went with the 205 section as the car was supplied with.
Joel
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thegoose
6,599 posts
79 months
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Mr_Simpson said: Bought a 964 recently myself, I like to research these things...
I've read the best overall tyres are Continental Contact Sport 2's. For road use they're OK, but they're far from being what most people consider "best overall" - that would more likely be a PS2 or S-02. I took my (standard, same 17" sizes as a 964) 993 round Oulton yesterday on Conti SC2's and it wasn't good at all (I was there under medical advice to see how my recent injury stood up to track driving, before racing there this weekend, so I wan't expecting or needing much performance and it was the most suitable car to hand). I'd have been happier on almost any other premium tyre - Contis just don't work when pushing on.
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ras62
262 posts
25 months
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You were setting a fair pace yesterday Marcus, the old girl was going very nicely...I did notice the tyres squealing their submission lol
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RSGulp
1,294 posts
108 months
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Hi Sebba. If you're interested I have a pair of nearly new Bridgestone SO2 N3 size: 205/50 ZR17. I'll send you an email.
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