Searching for the elusive "Cup 1 Wheel" - Found!
07-08-2009, 01:58 AM
#34
Nordschleife Master
^^^^^
So they must be cup I design wheels and NOT 928 GTS Cup I wheels then... That should make them hold air better and be MUCH cheaper! They are my fav 928 wheel, but I still like the CIII and CIII lightweight better...
So they must be cup I design wheels and NOT 928 GTS Cup I wheels then... That should make them hold air better and be MUCH cheaper! They are my fav 928 wheel, but I still like the CIII and CIII lightweight better...
07-08-2009, 09:34 AM
#36
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The RDK equipped wheels require use of a special tool to remove the sensors to replace the red rubber O ring that seals them. If replaced they should be leak free for a long time.
07-08-2009, 03:57 PM
#39
Rennlist Member
Not sure what all the 'hehe' is about... but clearly somethin' ain't gettin' thru. 
James & Erkka (and others) are right on about this Joe...
-An 18" wheel will not add very much to the total height of a tire (usually 0.5" at most)- you must consider the difference in the sidewall height -not the wheel diameter. -Your concern about a too-tall tire won't be a real concern.
-Cup I's for the GTS will be much more expensive on the front end and in maintaining them and/or replacing them. Let the owners of concours GTSs (and with bottomless pockets) worry about those. -You mentioned very bad roads.... do you want to have to replace one of these expensive wheels?
-Tire size selection for 16" and 17" wheels is getting smaller and smaller. By choosing this wheel size -you limit your opportunities for replacement in the future... and good choices will cost more than a similar tire in 18" or 19". -Again, you mentioned bad roads.... frequent tire replacement will be your reality. -How much will you want to spend later?
So, in considering wheel choices -your environment (bad roads) should really take priority here. You need to find a cheap, easily replaceable, commonly sized wheel -if you want to drive the car on a frequent basis without worry... This narrows the field significantly.
Your choices should be any of the following:
-the Italian knockoffs. (cheap, but a little heavy -but in city driving, they will take a hit & keep going)
-dealership takeoffs. (real Porsche wheels; not as expensive as new replacements; singles can be found)
-cheap aftermarket wheels. (Victor Equipment; etc., a little heavy but cheap & replaceable if they get bent)
-CCW wheels. (lighter weight; some 3-piece; attractive; still reasonable in price to replace)
FWIW... I have the Victor Equipment 'LeMans' wheels on my '88 (avatar). They don't have the 928 listed in their fitment chart, so I used the 911 Turbo specs. I have 18x8 and 18x11 with no spacers. The wheel lip is rolled -which is something Porsche ended up doing later in production- and what I would recommend to any 928 owner, just in case.
Best of luck Joe. Unless you have a full-on woodie for the Cup I's... keep in mind what they will cost you in the long run.
James & Erkka (and others) are right on about this Joe...
-An 18" wheel will not add very much to the total height of a tire (usually 0.5" at most)- you must consider the difference in the sidewall height -not the wheel diameter. -Your concern about a too-tall tire won't be a real concern.
-Cup I's for the GTS will be much more expensive on the front end and in maintaining them and/or replacing them. Let the owners of concours GTSs (and with bottomless pockets) worry about those. -You mentioned very bad roads.... do you want to have to replace one of these expensive wheels?
-Tire size selection for 16" and 17" wheels is getting smaller and smaller. By choosing this wheel size -you limit your opportunities for replacement in the future... and good choices will cost more than a similar tire in 18" or 19". -Again, you mentioned bad roads.... frequent tire replacement will be your reality. -How much will you want to spend later?
So, in considering wheel choices -your environment (bad roads) should really take priority here. You need to find a cheap, easily replaceable, commonly sized wheel -if you want to drive the car on a frequent basis without worry... This narrows the field significantly.
Your choices should be any of the following:
-the Italian knockoffs. (cheap, but a little heavy -but in city driving, they will take a hit & keep going)
-dealership takeoffs. (real Porsche wheels; not as expensive as new replacements; singles can be found)
-cheap aftermarket wheels. (Victor Equipment; etc., a little heavy but cheap & replaceable if they get bent)
-CCW wheels. (lighter weight; some 3-piece; attractive; still reasonable in price to replace)
FWIW... I have the Victor Equipment 'LeMans' wheels on my '88 (avatar). They don't have the 928 listed in their fitment chart, so I used the 911 Turbo specs. I have 18x8 and 18x11 with no spacers. The wheel lip is rolled -which is something Porsche ended up doing later in production- and what I would recommend to any 928 owner, just in case.
Best of luck Joe. Unless you have a full-on woodie for the Cup I's... keep in mind what they will cost you in the long run.
07-08-2009, 04:06 PM
#40
Nordschleife Master
Doc,
What I was saying is that the TPM systems never seal perfectly so wheels with that system installed (like REAL 928 Cup I wheels) tend to loose air at a MUCH higher rate than the 1 psi/month rule of thumb! Even when you install them perfectly to Porsche specs they don't hold air as well...
That is just my personal experience there...
I say cheaper, because most all of the Cup I wheels I have seen w/o tires are $1100 and up for the set. If you had to buy them new...GOOD LUCK! The TPM sensors are $800 each and there are TWO per wheel!
What I was saying is that the TPM systems never seal perfectly so wheels with that system installed (like REAL 928 Cup I wheels) tend to loose air at a MUCH higher rate than the 1 psi/month rule of thumb! Even when you install them perfectly to Porsche specs they don't hold air as well...
That is just my personal experience there...
I say cheaper, because most all of the Cup I wheels I have seen w/o tires are $1100 and up for the set. If you had to buy them new...GOOD LUCK! The TPM sensors are $800 each and there are TWO per wheel!
07-08-2009, 04:21 PM
#42
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Hi White Lightnin',
I really am not that dense.
You hit on it directly, I want more sidewall height, which a 17" wheel will do as compared to an 18" wheel ...and I want to come as close as I can to the offset specs for the 928, 65mm for the front wheels and 55mm for rear wheels.
Phil Chadwick's paper, "New Wheels For Your 928", was very clear on the do's and dont's and what the tradeoff's are if you are willing to experiment. I think his write up is concise and to-the-point, covering the whole gambit of tire and wheel selections. I recommend it, the paper is a great read.
http://www.landsharkoz.com/forms/928wheels.pdf
Mostly, I appreciate everyone on Rennlist for their help, advise and opinions. I am willing to dig around a bit, and I have found wealth of information people have shared. I just hope one day I know enough, I am good enough to help someone else, as much as I have been helped by the folks here.
Very Truly Yours,
Joe Taylor
I really am not that dense.
You hit on it directly, I want more sidewall height, which a 17" wheel will do as compared to an 18" wheel ...and I want to come as close as I can to the offset specs for the 928, 65mm for the front wheels and 55mm for rear wheels.
Phil Chadwick's paper, "New Wheels For Your 928", was very clear on the do's and dont's and what the tradeoff's are if you are willing to experiment. I think his write up is concise and to-the-point, covering the whole gambit of tire and wheel selections. I recommend it, the paper is a great read.
http://www.landsharkoz.com/forms/928wheels.pdf
Mostly, I appreciate everyone on Rennlist for their help, advise and opinions. I am willing to dig around a bit, and I have found wealth of information people have shared. I just hope one day I know enough, I am good enough to help someone else, as much as I have been helped by the folks here.
Very Truly Yours,
Joe Taylor
07-08-2009, 04:48 PM
#43
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I had for sale set of original Cup I's from manual GTS. They are sort of sold already but haven't got $$$ from buyer yet. They are in really rough condition and thus price was only $500. No idea if sensors work or not but at least they did hold air. If deal doesn't go through they will come back to market.
07-08-2009, 05:03 PM
#44
Rennlist Member
I wasn't tryin' to bust on you that much Joe (that's why I put the smiley).
If this is because of the bad roads... the technology in an 18" tire's sidewall is very good. They are a lot stiffer and can take more punishment since they were first introduced. This is probably due to their commonality in today's production vehicles.
You must not forget... spacers were usually used in concert with the advertised offset spec. This is for clearance of the running gear, brakes, etc... On a 17" wheel, spacers are a given due to the close proximity of the rear control arms & such. My 18" rears have no spacers and due to the wheel's diameter, the critical suspension pieces fit inside the wheel.
It's a good primer, but dated (no mention of fitment for some 18" tires or any 19" or 20" tires). With the selections of wheels from all available sources today -the limitations are fewer. When dealing with stock wheels or replica-stock -yes there are many limitations. When companies like CCW (no affiliation) can make wheels in any diameter, in any width and in any offset you want... why limit yourself?
You're gonna do fine Joe! The varied and often contradictory opinions (at least by me) here are to give you options... and are based in the sincere desire to not see you spend an exhorbitant amount of money for genuine GTS Cup I wheels and see them get mangled on the bad roads of J-ville... and I assume you want to drive it the way it was meant to be driven.... 
Apologies for any negativity... implied or received.
Phil Chadwick's paper, "New Wheels For Your 928", was very clear on the do's and dont's and what the tradeoff's are if you are willing to experiment. I think his write up is concise and to-the-point, covering the whole gambit of tire and wheel selections. I recommend it, the paper is a great read.
http://www.landsharkoz.com/forms/928wheels.pdf
http://www.landsharkoz.com/forms/928wheels.pdf
Mostly, I appreciate everyone on Rennlist for their help, advise and opinions. I am willing to dig around a bit, and I have found wealth of information people have shared. I just hope one day I know enough, I am good enough to help someone else, as much as I have been helped by the folks here.
Apologies for any negativity... implied or received.
Last edited by White Lightnin'; 07-08-2009 at 05:22 PM.
07-08-2009, 05:48 PM
#45
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Hi Erkka,
Helsinki is a beautiful place, I have been there a few times.
Thank you for the offer. I think its much too far away for shipping wheels around to me in Florida. Here in the US, it's something on the order of $200 to ship a set of wheels.
I can only imagine how much it would cost from Finland.
Very Truly Yours,
Joe Taylor
Helsinki is a beautiful place, I have been there a few times.
Thank you for the offer. I think its much too far away for shipping wheels around to me in Florida. Here in the US, it's something on the order of $200 to ship a set of wheels.
I can only imagine how much it would cost from Finland.
Very Truly Yours,
Joe Taylor