Fikse ZFs - 17” Rear Wheels... 9.0 or 9.5 inches? - Page 2 - Rennlist - Porsche Discussion Forums

Go Back  Rennlist - Porsche Discussion Forums > Air/Oil Cooled Technical Discussion Areas > 964 Forum
Reload this Page >

Fikse ZFs - 17” Rear Wheels... 9.0 or 9.5 inches?

Notices
964 Forum
Sponsored By:
Sponsored By:

Fikse ZFs - 17” Rear Wheels... 9.0 or 9.5 inches?

 
Old 12-02-2018, 04:10 PM
  #16  
Bill Verburg
Addict
Rennlist Member

 
Bill Verburg's Avatar
 
Join Date: May 2001
Posts: 10,850
Default

Originally Posted by GoKart View Post
Do you have to flatten the oil line with a 10” rear wheel, if you don’t lower the car too much....? Maybe a lower-than-stock-US-ride-height, but not-quite-RS-ride-height?
On the ones I've seen they usually use a 993 10ET65 w/ 21mm spacer for ET44, thes have a couple more mm backspace than even a 9ET55, The tire of course usually protrudes even further(a 275 more so than a 255). So yes a flattened oil line is wanted.
Bill Verburg is online now  
Old 12-02-2018, 07:58 PM
  #17  
GoKart
User
 
GoKart's Avatar
 
Join Date: Nov 2008
Location: CO
Posts: 623
Default

Originally Posted by Bill Verburg View Post
On the ones I've seen they usually use a 993 10ET65 w/ 21mm spacer for ET44, thes have a couple more mm backspace than even a 9ET55, The tire of course usually protrudes even further(a 275 more so than a 255). So yes a flattened oil line is wanted.

Thank you for the reply. I would run a 255 or 265, nothing bigger, and a street tire, not an R-compound.

I don’t want to flatten the oil line if I can avoid it. Just because the car did not come this way.

Is there any negative to flattening it? How much does it really need...?
GoKart is offline  
Old 12-03-2018, 01:03 PM
  #18  
911Jetta
Addict
Rennlist Member
 
911Jetta's Avatar
 
Join Date: Dec 2003
Location: NC
Posts: 6,329
Default

Sorry for the hijack OP

Originally Posted by Bill Verburg View Post
...when used w/ a 265/35 tire the 9.5 ET47 wheel has a backspace of 7.1"(180.4mm) though I have seen 10ET ET45 used w/ 275/35x18) wheel b/s is7.27"(184.7mm) this should be considered the max b/s that can be used on a 964, the 265 tire b/s is ~7.07"(181mm) a wider tire like a 275 would have a little more backspace
Originally Posted by Atgani View Post
Hi Bill, running the 9.5 x 17 ET68 Cup rears with a 21mm spacer leaves a lot of clearance between the tyre and fender. I think I ended using a 28 or even 32mm rear spacer to get the standard 255/40 rear tyres to fill the fender well out nicely. See attached images of my old car running this set up.
As I recall the C2 and RS run “unflattened” oil feed/return pipes.
I'm running 9.5s but only see a 5 mm spacer...

Originally Posted by Bill Verburg View Post
On the ones I've seen they usually use a 993 10ET65 w/ 21mm spacer for ET44, thes have a couple more mm backspace than even a 9ET55, The tire of course usually protrudes even further(a 275 more so than a 255). So yes a flattened oil line is wanted.
All of this rim size and spacer information is interesting.

My car came with huge (plump) tires, so I better check how close the tires are to the oil line...

Fronts are 8s rolling on 235/45s (no spacer)
Rears are 9.5s rolling on 275/40s (with a 5 mm spacer)

I'm sure everything is fine, but given the rim size and spacer discussion, does any one know which reproduction rims these are?



911Jetta is online now  
 


Thread Tools
Search this Thread

Contact Us About Us Advertising Cookie Policy Privacy Statement Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: