Will 993 wheels fit on the 964?
11-01-2001, 03:02 PM
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Will 993 wheels fit on the 964?
I'm looking for a second set of wheels for track tires, specifically some 7 & 9 x 17 to fit on my C2. I have seen several sets of 993 take-offs advertised. And when I call on them, I get some sellers saying they will "just bolt right on". Others say they will not.
Any C2 owners out there that have first-hand experience? If they do work, is there enough clearance on the rears for 9 inch wide wheels?
Thanks,
Steve
Any C2 owners out there that have first-hand experience? If they do work, is there enough clearance on the rears for 9 inch wide wheels?
Thanks,
Steve
11-01-2001, 03:35 PM
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Steve,
Here is one of Adrian's earlier posts on putting 17" wheels on a 964:
Also, I know that people do put 9" wide 993 rims on the 964's. Personally, I have the 8.5" wide 17" Boxster rims in the back of my car. The 9" wide rims were mighty close to the oil return tubes...a little too close for comfort, in my book.
I know there's lots of posts on 17" wheels for the 964 -- you should probably search the board for other's insights.
Good luck!
-- Melissa
Here is one of Adrian's earlier posts on putting 17" wheels on a 964:
1989 and 1990 964s require the steering stops to be replaced and a minor structural modification to be carried out before installing 17 inch wheels. Failure to do so may and will at normal ride height or when lowered too far,
I enclose the text from the TSB,
Ciao,
Adrian.
Approved 17 Inch Wheel
91porsche03
July 30, 1991
Model Group
911 C2/C4 4
Part Identifier Number
4405 9106
Subject: 17 Inch Wheel Approval
ATTENTION: Service Manager/Service Technician
This bulletin supersedes Technical Bulletin Group 4, Number 9106, dated June 28, 1991.
Models Affected: 911 Carrera 2 and 911 Carrera 4
Concern: Installing 17 inch wheels on 911 Carrera 2/4.
General Information: The following 17 inch rim/tire sizes and tire makes are presently approved for all 911 Carrera 2/4 models.
Tire Size Rim Size Offset Remarks
Front Axle
205/50 ZR 17 7J x 17 AH 55mm
Rear Axle
255/40 ZR 17 8J x 17 AH 52mm No snow chain clearance Note: Rim size 9J x 17 AH ('91 911 Turbo rear axle) is not approved for 911 Carrera 2/4.
Approved tire makes and types:
Bridgestone Expedia S-01 NO Michelin MXX 3 NO Pirelli P700-Z NO Yokohama A-008 P NO
Tire Pressure: Summer tires "17 inch"
Front axle: 2.5 Bar (36 psi)
Rear axle: 2.5 Bar (36 psi)
Note: Tire pressures apply only to Porsche approved tire makes and types. Measure tire pressure only when tires are cold (20~ Celsius or 68~ Fahrenheit). Do not underinflate tires.
Figure 1
Service Information: 1. When installing 17 inch wheels on 911 Carrera 2/4, the steering stop washers, left and fight must be replaced with stop washers Part Number 964 347 325 02 (arrow in Figure 1). Refer to 911 Carrera 2/4 Workshop Manual Volume IV, page 48-3.
Figure 2
2. The bumper cover plastic edge should protrude slightly in the bumper cover to fender joint area. If the fender metal edge protrudes, only the metal edge should be reworked (cut) in the area of the outer mounting screws on the left and fight side to ensure adequate tire clearance (arrow in Figure 2). After cutting metal, apply rust prevention paint.
Parts Information: The following parts are required in addition to the tires:
Wheel rim 7J x 17 Part Number 965 362 124 00
Wheel rim 8J x 17 Part Number 965 362 126 00
(two each required)
Steering stop:Part Number 964 347 325 02 (two required)
Rubber valve:Part Number 900 265 001 50 (four required)
Conversion sets are also available from the Porsche parts department A set consists of:
Four wheels with tires mounted and balanced
Four wheel center hub caps
Two steering stops
Wheel rim cleaner
The following sets are available:
Wheels with Bridgestone Expedia S-01 N0 tires Part Number 000 043 180 00
Wheels with Pirelli P700-ZN0 tires
Part Number 000 043 180 01
Wheels with Yokohama A-008 P N0 tires
Part Number 000 043 180 02
I enclose the text from the TSB,
Ciao,
Adrian.
Approved 17 Inch Wheel
91porsche03
July 30, 1991
Model Group
911 C2/C4 4
Part Identifier Number
4405 9106
Subject: 17 Inch Wheel Approval
ATTENTION: Service Manager/Service Technician
This bulletin supersedes Technical Bulletin Group 4, Number 9106, dated June 28, 1991.
Models Affected: 911 Carrera 2 and 911 Carrera 4
Concern: Installing 17 inch wheels on 911 Carrera 2/4.
General Information: The following 17 inch rim/tire sizes and tire makes are presently approved for all 911 Carrera 2/4 models.
Tire Size Rim Size Offset Remarks
Front Axle
205/50 ZR 17 7J x 17 AH 55mm
Rear Axle
255/40 ZR 17 8J x 17 AH 52mm No snow chain clearance Note: Rim size 9J x 17 AH ('91 911 Turbo rear axle) is not approved for 911 Carrera 2/4.
Approved tire makes and types:
Bridgestone Expedia S-01 NO Michelin MXX 3 NO Pirelli P700-Z NO Yokohama A-008 P NO
Tire Pressure: Summer tires "17 inch"
Front axle: 2.5 Bar (36 psi)
Rear axle: 2.5 Bar (36 psi)
Note: Tire pressures apply only to Porsche approved tire makes and types. Measure tire pressure only when tires are cold (20~ Celsius or 68~ Fahrenheit). Do not underinflate tires.
Figure 1
Service Information: 1. When installing 17 inch wheels on 911 Carrera 2/4, the steering stop washers, left and fight must be replaced with stop washers Part Number 964 347 325 02 (arrow in Figure 1). Refer to 911 Carrera 2/4 Workshop Manual Volume IV, page 48-3.
Figure 2
2. The bumper cover plastic edge should protrude slightly in the bumper cover to fender joint area. If the fender metal edge protrudes, only the metal edge should be reworked (cut) in the area of the outer mounting screws on the left and fight side to ensure adequate tire clearance (arrow in Figure 2). After cutting metal, apply rust prevention paint.
Parts Information: The following parts are required in addition to the tires:
Wheel rim 7J x 17 Part Number 965 362 124 00
Wheel rim 8J x 17 Part Number 965 362 126 00
(two each required)
Steering stop:Part Number 964 347 325 02 (two required)
Rubber valve:Part Number 900 265 001 50 (four required)
Conversion sets are also available from the Porsche parts department A set consists of:
Four wheels with tires mounted and balanced
Four wheel center hub caps
Two steering stops
Wheel rim cleaner
The following sets are available:
Wheels with Bridgestone Expedia S-01 N0 tires Part Number 000 043 180 00
Wheels with Pirelli P700-ZN0 tires
Part Number 000 043 180 01
Wheels with Yokohama A-008 P N0 tires
Part Number 000 043 180 02
I know there's lots of posts on 17" wheels for the 964 -- you should probably search the board for other's insights.
Good luck!
-- Melissa
11-01-2001, 03:39 PM
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Steve,
I would add that Viken is very, very knowledgeable about tires & wheels on 911's.
I'll also add that Todd Serota (check the tracquest.net boards) ran 17" 993 wheels on his '90 C2 Cab (which he traded in on a 996 cab.) His car saw lots & lots of track time, so you might check with Todd to see if he has any specific advice as far as putting the 993 wheels on a 964 for track duty.
Again, good luck!
-- Melissa
I would add that Viken is very, very knowledgeable about tires & wheels on 911's.
I'll also add that Todd Serota (check the tracquest.net boards) ran 17" 993 wheels on his '90 C2 Cab (which he traded in on a 996 cab.) His car saw lots & lots of track time, so you might check with Todd to see if he has any specific advice as far as putting the 993 wheels on a 964 for track duty.
Again, good luck!
-- Melissa
11-01-2001, 03:55 PM
#5
Burning Brakes
I have a 92 C2 with 996 rims (55mm offset front and rear). The fronts are 7 inches wide and the rears are 9 inches, so it can be done. However, as Melissa pointed out, it may not be a "bolt on" modification depending upon the model of 964.
11-01-2001, 04:04 PM
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Originally posted by MelissaM:
<STRONG>I would add that Viken is very, very knowledgeable about tires & wheels on 911's.
I'll also add that Todd Serota (check the tracquest.net boards) ran 17" 993 wheels on his '90 C2 Cab (which he traded in on a 996 cab.) His car saw lots & lots of track time, so you might check with Todd to see if he has any specific advice as far as putting the 993 wheels on a 964 for track duty.</STRONG>
<STRONG>I would add that Viken is very, very knowledgeable about tires & wheels on 911's.
I'll also add that Todd Serota (check the tracquest.net boards) ran 17" 993 wheels on his '90 C2 Cab (which he traded in on a 996 cab.) His car saw lots & lots of track time, so you might check with Todd to see if he has any specific advice as far as putting the 993 wheels on a 964 for track duty.</STRONG>
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11-02-2001, 05:26 AM
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There were two offsets for rear wheels both 16 AND 17 inch wheels for the 993.
55mm and 70mm. The first 993s were 70mm on the rear and 55mm on the front. I followed the original advice of "oh yes they fit no problems" (I purchased these wheels from the USA).
The 17 inch 993 wheel with 70mm rear offset is also known as the winter wheel. They are around but they are 8JX17 not 9JX17.
The 964 has a built in offset of 52.3mm front and rear. If you have a post 1990 model you can install 55mm 964 or 993 17 inch wheels with a great deal of security. 1989 and 1990 models there is a rub issue on the front. I have photos of a badly damaged 1989 C4 caused by wheel rub. I still have some wheel rub on the front at full lock going backwards with 7JX17 wheels on the front. Tyres also play a role here. Some are wider than others despite being the same technical dimensions.
So to summarise,
Use wheels of 55mm offset front and rear.
Measure and check the clearance front and rear. Watch that rear oil line. Lower the 964 can improve or make worse the situation. Depends a lot on how low you go and which components you utilise,
Ciao,
Adrian
911C4
PS: My personal choice for the track wheels on a 964 would be 16 inch anyway. However the 17 inch 911 Turbo wheels (1991-1992) are great wheels, nice and light as well.
55mm and 70mm. The first 993s were 70mm on the rear and 55mm on the front. I followed the original advice of "oh yes they fit no problems" (I purchased these wheels from the USA).
The 17 inch 993 wheel with 70mm rear offset is also known as the winter wheel. They are around but they are 8JX17 not 9JX17.
The 964 has a built in offset of 52.3mm front and rear. If you have a post 1990 model you can install 55mm 964 or 993 17 inch wheels with a great deal of security. 1989 and 1990 models there is a rub issue on the front. I have photos of a badly damaged 1989 C4 caused by wheel rub. I still have some wheel rub on the front at full lock going backwards with 7JX17 wheels on the front. Tyres also play a role here. Some are wider than others despite being the same technical dimensions.
So to summarise,
Use wheels of 55mm offset front and rear.
Measure and check the clearance front and rear. Watch that rear oil line. Lower the 964 can improve or make worse the situation. Depends a lot on how low you go and which components you utilise,
Ciao,
Adrian
911C4
PS: My personal choice for the track wheels on a 964 would be 16 inch anyway. However the 17 inch 911 Turbo wheels (1991-1992) are great wheels, nice and light as well.
11-02-2001, 05:43 AM
#10
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Just to add my two cents worth...I have a '91 964 with 993 17" Cup II wheels that I use for track wheels, they work great! I do however, put a 6mm (1/4") spacer up front to bring the 225s away from the inner fender well...this does NOT require extended studs, there's just enough threads to pass PCA Club Sport guidelines. 
FWIW, they are 17" x 7" and 9" with Kumho ECSTA (yes, the NEW track tires) 225s and 275s
FWIW, they are 17" x 7" and 9" with Kumho ECSTA (yes, the NEW track tires) 225s and 275s
11-02-2001, 05:52 AM
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Just to add to this and purely by co-incidence, I just received some info for my book and this owner had to install 5mm spacers on the front of his 1990 C4 to install 225s on 996 17 inch wheels.
7mm spacers require new studs under the laws here. Under this is okay.
Way back in the dim dark ages, the recommended wheels and tyres for use on the track for the C4 were 225s on the front and 245s on the rear. With a few extra modifications of course,
Ciao,
Adrian
911C4
7mm spacers require new studs under the laws here. Under this is okay.
Way back in the dim dark ages, the recommended wheels and tyres for use on the track for the C4 were 225s on the front and 245s on the rear. With a few extra modifications of course,
Ciao,
Adrian
911C4
11-02-2001, 08:35 AM
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I have 16inch 993 7 and 9's on my 964 C2. I used a Weltmeister spacer on the rear which had 70mm offset to get the rears away from the inside fender well. Fronts are 55mm offset. Works great but eventually want the RUF 17's. I love those wheels. Roy Eames
11-02-2001, 08:37 AM
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Dear Roy,
I used a 15mm H&R spacers on the rear with 9Jx16s at 70mm offset. These are my winter wheels and time is coming up to install them. I am going to hang off a long as possible. Hopefully after November 18th,
Ciao,
Adrian
911C4
I used a 15mm H&R spacers on the rear with 9Jx16s at 70mm offset. These are my winter wheels and time is coming up to install them. I am going to hang off a long as possible. Hopefully after November 18th,
Ciao,
Adrian
911C4
11-04-2001, 02:02 PM
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Jon, You are thinking correctly. In Adrians case and mine the rear wheel with 70mm offset was too close to the inner fender(center of car). Therefore the 15mm spacer decreased the offset to the correct 55mm. Roy Eames
11-08-2001, 08:36 AM
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Originally <STRONG>
My personal choice for the track wheels on a 964 would be 16 inch anyway. However the 17 inch 911 Turbo wheels (1991-1992) are great wheels, nice and light as well.</STRONG>
My personal choice for the track wheels on a 964 would be 16 inch anyway. However the 17 inch 911 Turbo wheels (1991-1992) are great wheels, nice and light as well.</STRONG>
I'm curious why you'd prefer 16" wheels for track wheels on a 964?