924Board.org

skytrooper · Joined: 29 Aug 2007 Posts: 461 Location: Canandaigua, NY

I have the opportunity to buy a set of Hoosier track tires mounted on porsche rims.
The owner stated to me that the offset is 50 and 55. Since the 924 stock offset is 52...would I need spacers for these to fit ? Would I also need to roll the fender lip ?
Sorry to ask so many questions as of late but I am also trying to figure out what is required equipment in 4 different sanctioning bodies (PCA, SCCA, EMRA, and NASA) for time trial and DE. My head is swimming
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Matt

1987 - 924S "Black Pearl"
1982 - BMW 633CSi
1984 - BMW 528e
1983 - 944 N/A "Blue Max" (Gone)
1981 - 931 "Scarlet Harlot" (Gone)
1976 911S Targa (Gone)

morghen · Joined: 21 Jan 2005 Posts: 9102 Location: Romania

it depends on what 924 are we talking about...the 4lug 924 wheel has 23ET not 52....also...it depends on how wide the rims are....ET50 does not tell you enough without the width of the rim.
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Supercharger and EFI kits
https://www.the924.com

skytrooper · Joined: 29 Aug 2007 Posts: 461 Location: Canandaigua, NY

Both of my 924's are 5 lug (1987 924S & 1981 924 turbo).

Possibly I am mistaken in the offset
_________________
Matt

1987 - 924S "Black Pearl"
1982 - BMW 633CSi
1984 - BMW 528e
1983 - 944 N/A "Blue Max" (Gone)
1981 - 931 "Scarlet Harlot" (Gone)
1976 911S Targa (Gone)

Rasta Monsta · Joined: 12 Jul 2006 Posts: 11733 Location: PacNW

You are correct about the 52.3 offset, but Morghen is correct that the rim width is needed to give you an answer.
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Toofah King Bad

WeiBe (1987 924S 2.5t) - 931 S3

skytrooper · Joined: 29 Aug 2007 Posts: 461 Location: Canandaigua, NY

OK...here are the details

Tires - set of 4 17" Porsche wheels with Hoosier R6 track tires (225 front/255 rear).

Rim width - 7" front and 8.5" rear I believe

The offset is 55 and 50 and the bolt pattern is 5 x 130

They were on my '87 944 Turbo, which was considered "late" offset. I
believe the rims originally came from either a Boxster or a 911

I am thinking that these may be too large
_________________
Matt

1987 - 924S "Black Pearl"
1982 - BMW 633CSi
1984 - BMW 528e
1983 - 944 N/A "Blue Max" (Gone)
1981 - 931 "Scarlet Harlot" (Gone)
1976 911S Targa (Gone)

joecitizennn · Joined: 12 Sep 2005 Posts: 2096 Location: no mans land

I bet they will work. You may have to run a 245s on the rear if the 255s rub

Rasta Monsta · Joined: 12 Jul 2006 Posts: 11733 Location: PacNW

I have 225s on the rear (on 8s), and they are 1/2 inch from rubbing my rolled fender.
_________________
Toofah King Bad

WeiBe (1987 924S 2.5t) - 931 S3

morghen · Joined: 21 Jan 2005 Posts: 9102 Location: Romania

ok....i'm 75% sure that you will have a clearence problem with the fronts. The only way to find out is put the wheels on your car.
_________________
Supercharger and EFI kits
https://www.the924.com

skytrooper · Joined: 29 Aug 2007 Posts: 461 Location: Canandaigua, NY

I do not think that is is any way that these will fit a stock 924S.
_________________
Matt

1987 - 924S "Black Pearl"
1982 - BMW 633CSi
1984 - BMW 528e
1983 - 944 N/A "Blue Max" (Gone)
1981 - 931 "Scarlet Harlot" (Gone)
1976 911S Targa (Gone)

Brockoli · Posted: Wed Jan 30, 2008 5:28 am Post subject:

what is a rolled fender? i understand it gives you more space but how is it done?
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'80 924 M471,Wideband O2, Full coilover susp,23/19 sways,Bilstiens,KLA Strut Brace,Roll Bar,Test Pipe,BBS RS, Willwood BBK

25% of a '87 944 Chumpcar http://straightpipe.ca/forums/showthread.php?t=2454

'79 924 Sebring Edition(Sitting)

Rasta Monsta · Joined: 12 Jul 2006 Posts: 11733 Location: PacNW

Rolling the fender is squashing down the perpendicular lip on the inside edge of the fender.

*click*

There are different approaches, including a special tool that bolts to your hub as well as a baseball bat. I found it very easy with channel locks. I used a piece of particle board wrapped in a shop towel to protect the paint, and put a piece of heater hose on the jaw of the pliers to minimize loss of coating on the inside. Crunch, crunch, crunch, work along the radius of the wheel arch.

FWIW, the fronts were factory rolled on my car, but not the rears.
_________________
Toofah King Bad

WeiBe (1987 924S 2.5t) - 931 S3

joecitizennn · Joined: 12 Sep 2005 Posts: 2096 Location: no mans land

I know for a fact that 7" and 8" 16s can be fit under a 924s with a 52mm offset, and tires having a 55 and 50 AR . While I am not qulaified to say crap about 17s, I do think with maybe a 205 40 in the front and a 225 35 tire in the back they would fit. Maybe even a 245 35 in the back. If the tires and the rims are coming as one deal, insist on trying them first.

Are these porsche rims or some aftermarket horror?

skytrooper · Joined: 29 Aug 2007 Posts: 461 Location: Canandaigua, NY

They are porsche rims, but I think that 17's are going to be way too big. 16's maybe if they weren't as wide as these.
_________________
Matt

1987 - 924S "Black Pearl"
1982 - BMW 633CSi
1984 - BMW 528e
1983 - 944 N/A "Blue Max" (Gone)
1981 - 931 "Scarlet Harlot" (Gone)
1976 911S Targa (Gone)

joecitizennn · Joined: 12 Sep 2005 Posts: 2096 Location: no mans land

Are you sure of the rim widths? The tires suggest 8 and 10 inch wide rims. Or at the very least 7 and 9

Neil924 · Joined: 18 Mar 2003 Posts: 4225 Location: Canada