Jump to content

Server Lease Renewal/Software Licenses

Our yearly server lease, software licenses, as well as hardware operating costs, ARE due Dec 6th, 2021. Our current donations have fallen far short of the funds we need to renew. Please remember the RennTech.org community is Member supported so please consider a donation to help...  THANK YOU!

Welcome to RennTech.org Community, Guest

There are many great features available to you once you register at RennTech.org
You are free to view posts here, but you must log in to reply to existing posts, or to start your own new topic. Like most online communities, there are costs involved to maintain a site like this - so we encourage our members to donate. All donations go to the costs operating and maintaining this site. We prefer that guests take part in our community and we offer a lot in return to those willing to join our corner of the Porsche world. This site is 99 percent member supported (less than 1 percent comes from advertising) - so please consider an annual donation to keep this site running.

Here are some of the features available - once you register at RennTech.org

  • View Classified Ads
  • DIY Tutorials
  • Porsche TSB Listings (limited)
  • VIN Decoder
  • Special Offers
  • OBD II P-Codes
  • Paint Codes
  • Registry
  • Videos System
  • View Reviews
  • and get rid of this welcome message

It takes just a few minutes to register, and it's FREE

Contributing Members also get these additional benefits:
(you become a Contributing Member by donating money to the operation of this site)

  • No ads - advertisements are removed
  • Access the Contributors Only Forum
  • Contributing Members Only Downloads
  • Send attachments with PMs
  • All image/file storage limits are substantially increased for all Contributing Members
  • Option Codes Lookup
  • VIN Option Lookups (limited)

8Jx18 front wheels on a pre-facelift 996 that 'should' use 7.5


Recommended Posts

Hi all

 

Please excuse the newbie question :)

 

I just bout a pre-facelift 996 that is fitted with standard 17" 'technology' rims.

 

I'm looking at upsizing to 18", mostly because 18" tyres seem to be a lot cheaper these days than their 17" equivalents (at least, in the UK they are).  EG, a Michelin PS2 'N' in 205/50/17 costs almost £180 whereas the same tyre in 225/40/18 is £110.  That's a huge difference!

 

I'm hunting around for some decent 18" rims and found a nice set of original 5-spokes (pic attached) for a good price, but the fronts are 8J.  In the manual, it says 8J is for MY02 and up and for my model, the 'correct' size is 7.5J.

 

I've also uploaded a pic of my vehicle, 'as is', for good measure :)

 

Can I fit these on my car and would there be any detrimental consequences?

 

Many thanks!

post-98784-0-00695400-1414922710_thumb.j

post-98784-0-69854800-1414922735_thumb.j

Link to comment
Share on other sites

It's best to stick to the manufacturer's options size as otherwise it could be seen as a modification.  It's not just the rim diameter it's also the offset that needs to be right. The wrong offset alters the track width and hence the road holding characteristics, not that it would be that significant at normal road speeds in the UK. The offset is also stated in the handbook.

 

If you want some 7.5j fronts and 10j rears which are genuine Porsche Turbo type then email me as I have a set available in pretty good condition.  They came off my 2003 C2 996 which had the wrong wheels when I bought it.  I attach a picture of the car with these turbo wheels.  I have since fitted the correct size 8/10 X18's wheels which should have been on the car at the time of manufacture.

 

H

 

 

post-86549-0-58206100-1414940715_thumb.j

Link to comment
Share on other sites

Thanks for your response...

 

The offset on the ones in the photo above - Front 8jx18 et50

 

Only difference seems to be 0.5" wider...  the manual says 7.5J 18 RO 50 for 'up to model year 2001' (mine is '99) and 8J 18 RO 50/52 for model year as of 2002...  tyre size for both is the same- 225/40/ZR18 

Edited by declandio
Link to comment
Share on other sites

8" fronts are fine - I have them on my MY99 - stay with the same offset and you can go to a 235 front without rubbing.

Thanks for that Loren, much appreciated and quite timely since I read your response whilst on my way to take a look at the wheels... and ended up buying them for £360!  Not a bad deal at all considering the rears have plenty of wear left on the tyres so I won't need to replace them for quite a while!  

 

Front 8jx18 et50

Rear 10jx18 et65

 

So I'm good to go, thanks again...

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.