996 widebody/Turbo/ C4S wheels on 928
01-27-2009, 03:06 PM
#16
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Cosmo--
since you have found Wheel Dynamics' website, you could just call Carlos and ask him if the wheels will fit. He is always happy to help, and is very knowledgeable about 928 fitments. He can tell you if the wheels need a spacer, can use a spacer....or not.
your answer is only a phone call away.
--Russ
since you have found Wheel Dynamics' website, you could just call Carlos and ask him if the wheels will fit. He is always happy to help, and is very knowledgeable about 928 fitments. He can tell you if the wheels need a spacer, can use a spacer....or not.
your answer is only a phone call away.
--Russ
01-27-2009, 03:13 PM
#17
Rennlist Member
I just talked to the guy, 18 x 8 et 50 with 225 front, 18 x 11 et 45 with 295 rear. Rear tires are toast, one with a blowout. Fronts have a summer left with Michelin PS2's. Solid spoke factory Porsche wheels. He is going to take some pics and e-mail them to me tonight to save me the drive. So put 265's or 275's on the rear and call it a day?
265s are a no go.
275s are within the fitment range for an 11". Far from ideal rubber for an 11".
285s are getting closer
295s are right on.
305s are just badass
01-27-2009, 03:26 PM
#18
Rennlist Member
Thread Starter
The owner has winter tires on the exact same rims on his car now and he said he is running 265's on the 11" rims. Tire rack shows maximum rim width for 265 is 10.5, 275 it is 11" etc like you said. On Andrew's calculator, shows rubbing on 295's and all others fitting OK, however his calculator is based on a GT, not a 1985 S.
01-27-2009, 03:30 PM
#19
Nordschleife Master
I don't think I was all over the place. OP seemed a little confused as the thread went on, so I tried to help further.
I'm bitching because people tend to post answers that have already been answered.
It would make more sense to reaffirm to the OP by stating that what I wrote was accurate. For instance, +1 to what Jim said.
Instead it just "looks" like you just want everyone to understand that you know too.
If I see that someone has already answered the OP's question appropriately, I do not respond. But that's just me.
I'm bitching because people tend to post answers that have already been answered.
It would make more sense to reaffirm to the OP by stating that what I wrote was accurate. For instance, +1 to what Jim said.
Instead it just "looks" like you just want everyone to understand that you know too.
If I see that someone has already answered the OP's question appropriately, I do not respond. But that's just me.
i seriously have NEVER heard someone whining when i posted similiar answers to theirs
your a funny dude
01-27-2009, 03:38 PM
#21
Rennlist Member
Anyone know how to tub a 928 LOL!!!
The owner has winter tires on the exact same rims on his car now and he said he is running 265's on the 11" rims. Tire rack shows maximum rim width for 265 is 10.5, 275 it is 11" etc like you said. On Andrew's calculator, shows rubbing on 295's and all others fitting OK, however his calculator is based on a GT, not a 1985 S.
The owner has winter tires on the exact same rims on his car now and he said he is running 265's on the 11" rims. Tire rack shows maximum rim width for 265 is 10.5, 275 it is 11" etc like you said. On Andrew's calculator, shows rubbing on 295's and all others fitting OK, however his calculator is based on a GT, not a 1985 S.
Fronts are easy because both are the same. 225 max with ride height adjusted to 160mm minimum to eliminate rubbing
Rear 10" ET65 with 275s and a 18mm spacer work
Rear 11" ET45 with 275s will fit, but wheel tire fitment is marginal.
You will have to remove the stock 21mm and get some open end lugs, or change lug studs to a shorter length (more involved)
Rear 11" ET45 with 285s will fit, and wheel tire fitment will be better.
I plan to install 285s on the 11" rears because I don't want to do any flarring.
01-27-2009, 03:43 PM
#22
Rennlist Member
Thread Starter
Thanks Largecar I appreciate it! Sometimes the drama can be fun!
The rears are a 45 et, not 65's. My car has 21 mm factory spacers so effectively my rears currently are a 44 offset with the spacers. A 65 would definitely give me more wiggle room as I could use custom spacers.
The rears are a 45 et, not 65's. My car has 21 mm factory spacers so effectively my rears currently are a 44 offset with the spacers. A 65 would definitely give me more wiggle room as I could use custom spacers.
01-27-2009, 03:46 PM
#23
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Thanks Largecar I appreciate it! Sometimes the drama can be fun!
The rears are a 45 et, not 65's. My car has 21 mm factory spacers so effectively my rears currently are a 44 offset with the spacers. A 65 would definitely give me more wiggle room as I could use custom spacers.
The rears are a 45 et, not 65's. My car has 21 mm factory spacers so effectively my rears currently are a 44 offset with the spacers. A 65 would definitely give me more wiggle room as I could use custom spacers.
--Russ
Last edited by largecar379; 01-27-2009 at 04:21 PM.
01-27-2009, 03:51 PM
#24
Rennlist Member
You started by referring him to Wheel Dynamics and now you tell them the ET45 won't fit.
And for the record, I don't agree with you. They will fit, and have fit.
01-27-2009, 04:01 PM
#25
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01-27-2009, 04:13 PM
#27
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01-27-2009, 04:14 PM
#28
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01-27-2009, 04:21 PM
#29
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my apologies for my backwards math.
I usually never comment on this, as there are too many variables, but Carlos is at lunch and he is my reference for this issue.
edit:
wheel offset is the measurement of the wheel edge to the mounting point on the inside of the wheel.
therefore, if you are using my example (19x11 65et mm) where the wheel actually needs a 7mm spacer to prevent rubbing on the lower shock mount, then no--- a 45m et offset will not work. Why? because the wheel will be pushed outside the fender by 13mm (no spacer). plenty of clearance on the inside, but not on the outside. this was my reason for my comment on flaring or cutting the fenders.
this also depends greatly on the tires size in use. this is probably where you are getting your info on "yes, it will work". an 18 inch diameter wheel will have a different affect on fender clearance, as will tire size.
too many variables between tires sizes and rim widths.
my apologies for any confusion.
--Russ
I usually never comment on this, as there are too many variables, but Carlos is at lunch and he is my reference for this issue.
edit:
wheel offset is the measurement of the wheel edge to the mounting point on the inside of the wheel.
therefore, if you are using my example (19x11 65et mm) where the wheel actually needs a 7mm spacer to prevent rubbing on the lower shock mount, then no--- a 45m et offset will not work. Why? because the wheel will be pushed outside the fender by 13mm (no spacer). plenty of clearance on the inside, but not on the outside. this was my reason for my comment on flaring or cutting the fenders.
this also depends greatly on the tires size in use. this is probably where you are getting your info on "yes, it will work". an 18 inch diameter wheel will have a different affect on fender clearance, as will tire size.
too many variables between tires sizes and rim widths.
my apologies for any confusion.
--Russ
Last edited by largecar379; 01-27-2009 at 04:47 PM.
01-27-2009, 04:57 PM
#30
Rennlist Member
Thread Starter
OK, I think I have done some math here to help figure the fitment:
REAR
Original
177.8 mm rim
88.9 mm center of rim
44.0 mm offset with spacer
44.9 mm 1/2 of rim width minus offset for outer
132.9 mm 1/2 of rim width plus offset for inner
New
279.4 mm rim
139.7 mm center of rim
45.0 mm offset
94.7 mm 1/2 of rim width minus offset for outer
184.7 mm 1/2 of rim width minus offset for outer
Difference on last 2 for outer measurements: 49.8 mm
Difference on last 2 inner measurements: 51.8 mm
So using this calculation, the new rims will stick out 49.8 mm more and be 51.8 mm more inward on the rear then my current rims.
FRONT
Original
177.8 mm rim
88.9 mm center of rim
65.0 mm offset
23.9 mm 1/2 of rim width minus offset for outer
153.9 mm 1/2 of rim width plus offset for inner
New
203.2 mm rim
101.6 mm center of rim
50.0 mm offset
51.6 mm 1/2 of rim width minus offset for outer
151.6 mm 1/2 of rim width minus offset for outer
Difference on last 2 for outer measurements: 27.7 mm
Difference on last 2 inner measurements: -2.3 mm
So using this calculation, the new rims will stick out 27.7 mm more and be 2.3 mm less inward on the front then my current rims.
REAR
Original
177.8 mm rim
88.9 mm center of rim
44.0 mm offset with spacer
44.9 mm 1/2 of rim width minus offset for outer
132.9 mm 1/2 of rim width plus offset for inner
New
279.4 mm rim
139.7 mm center of rim
45.0 mm offset
94.7 mm 1/2 of rim width minus offset for outer
184.7 mm 1/2 of rim width minus offset for outer
Difference on last 2 for outer measurements: 49.8 mm
Difference on last 2 inner measurements: 51.8 mm
So using this calculation, the new rims will stick out 49.8 mm more and be 51.8 mm more inward on the rear then my current rims.
FRONT
Original
177.8 mm rim
88.9 mm center of rim
65.0 mm offset
23.9 mm 1/2 of rim width minus offset for outer
153.9 mm 1/2 of rim width plus offset for inner
New
203.2 mm rim
101.6 mm center of rim
50.0 mm offset
51.6 mm 1/2 of rim width minus offset for outer
151.6 mm 1/2 of rim width minus offset for outer
Difference on last 2 for outer measurements: 27.7 mm
Difference on last 2 inner measurements: -2.3 mm
So using this calculation, the new rims will stick out 27.7 mm more and be 2.3 mm less inward on the front then my current rims.