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Jodes
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Joined: 06 Apr 2013
Posts: 35



PostPosted: Tue Mar 20, 2018 3:56 pm    Post subject: BBS LM correct fitment and offset for widebody... Reply with quote

As title, please could someone confirm the correct fitment and offset for a C2S... presumably all WB cars are the same!?

I think I should be ordering...
8.5x18 ET 56
10x18 ET 50

Many thanks in advance!
 
  
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tp81
Suzuka


Joined: 04 Mar 2010
Posts: 1180
Location: Glasgow

1997 Porsche 993 Carrera 2S

PostPosted: Tue Mar 20, 2018 5:15 pm    Post subject: Reply with quote

Jodes,

This is the correct size required. I have sent you a message in relation to mine. I need to sell these, they have been boxed up since they were refurbished. Don't ever see me using them again. Shocking to admit but I have a full set of speedlines, replica cups and two sets of fuchs. Its a disease!
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1989 3.2 Targa
2013 110 Defender
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Jodes
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Joined: 06 Apr 2013
Posts: 35



PostPosted: Tue Mar 20, 2018 5:25 pm    Post subject: Reply with quote

Thanks.. PM sent!
 
  
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cableguy
Kyalami


Joined: 10 Sep 2007
Posts: 1774
Location: North Yorkshire


PostPosted: Tue Mar 20, 2018 6:52 pm    Post subject: Re: BBS LM correct fitment and offset for widebody... Reply with quote

Jodes wrote:

8.5x18 ET 56
10x18 ET 50


Fronts will be fine, however rears for a 993WB should be ET40 to achieve an OEM look and maybe a slightly lower figure to give a more stanced look.
The Rears you quote would require a 10mm spacer to look right as ET50's would sit 10mm further inside the arch. A good quality 10mm/15mm hubcentric spacer will give the desired look on an ET50 wheel. Thumb

C.
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tp81
Suzuka


Joined: 04 Mar 2010
Posts: 1180
Location: Glasgow

1997 Porsche 993 Carrera 2S

PostPosted: Tue Mar 20, 2018 8:01 pm    Post subject: Reply with quote

Apologies, I had forgotten about the spacers. I used these with the Wheels and have these as well. Embarassed
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Jodes
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PostPosted: Tue Mar 20, 2018 9:54 pm    Post subject: Reply with quote

Thanks chaps.... my small little brain doesn’t really understand offsets!

ET50 seems to be the only option available for the rear so presumably people are all using spacers!?!
 
  
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cableguy
Kyalami


Joined: 10 Sep 2007
Posts: 1774
Location: North Yorkshire


PostPosted: Tue Mar 20, 2018 11:04 pm    Post subject: Reply with quote

Jodes wrote:
Thanks chaps.... my small little brain doesn’t really understand offsets!

ET50 seems to be the only option available for the rear so presumably people are all using spacers!?!


One option is go for BBS e28's as these are generally available in a greater array of offsets.

Regarding LM's there are a couple of options:

Option 1 - Stick with the ET50 and add a 10mm/15mm hubcentric spacer. Remember that the C2S WB was supplied from the factory on 17" Cup 2's and a 31mm rear spacer. Wink

Option 2 - My personal favourite... Reverse mount the centres. This gives a greater dish and reduces the offset by 12-16mm, which is pretty much exactly where you need to be for the WB. Win Win...

C.
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Jodes
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PostPosted: Wed Mar 21, 2018 9:48 pm    Post subject: Reply with quote

Thanks Cableguy.. Option 2 probably better aesthetically but is there any issue with reverse mounting? I know loads of guys across the pond do it so I suppose we’d hear of any associated problems!?!

Do you have reverse mounted LMs on yours??
 
  
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cableguy
Kyalami


Joined: 10 Sep 2007
Posts: 1774
Location: North Yorkshire


PostPosted: Wed Mar 21, 2018 10:00 pm    Post subject: Reply with quote

Anytime Jodes.

Lots of wheel builders are now reverse mounting. Ensure the mounting surfaces are clean and the fixings torqued up in sequence then there shouldn't be any issues. I can recommend a good wheel builder if you don't fancy doing it yourself.

I don't have LM's on the 993 but did have a set on an e39 M5 a few years ago.
I run 3 Piece Speedline Daytona's which have a more aggressive offset over OEM. Reverse mounting the Daytona's would be a little too aggressive unfortunately!

C.
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Nurburger
Newbie


Joined: 16 Mar 2010
Posts: 37
Location: United States


PostPosted: Sun Mar 25, 2018 9:29 pm    Post subject: Reply with quote

There are no adverse effects with reverse mounting the centers on LM's. You are probably aware of the LM's construction with the inner/outer barrel being a single piece, so its a very robust structure.

You will want to polish the lips as the standard LM finish looks a little odd when reverse mounting.

I would also highly recommend going with 8" fronts ET56 and 11" rears ET56 for an excellent fitment. As mentioned above, reversing results in a roughly 15mm reduction in ET.

Here's a thread I posted on Rennlist:

https://rennlist.com/forums/993-forum/629628-bbs-lm-reverse-mounting-the-centers.html
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tp81
Suzuka


Joined: 04 Mar 2010
Posts: 1180
Location: Glasgow

1997 Porsche 993 Carrera 2S

PostPosted: Mon Mar 26, 2018 8:13 am    Post subject: Reply with quote

Apologies for the ignorance on offsets, always confuses me. Will the BBS Lm's fit a NB car?

The ET50 on the rears would this sit out too far?

Might stick my wheels back on after having looked at them again, they are nice. Very Happy




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cableguy
Kyalami


Joined: 10 Sep 2007
Posts: 1774
Location: North Yorkshire


PostPosted: Mon Mar 26, 2018 11:25 am    Post subject: Reply with quote

tp81 wrote:
Will the BBS Lm's fit a NB car?


Not without rolling the arches and maybe adding a little camber.

An OEM 10jx18" Speedline RS is ET65. I run a slightly more aggressive Speedline Daytona with an ET59 and my arches required a 25% roll to ensure no contact on full compression.

C.
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tp81
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1997 Porsche 993 Carrera 2S

PostPosted: Mon Mar 26, 2018 11:32 am    Post subject: Reply with quote

Thanks. Won’t be rolling the arches on the RS. Surprised
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cableguy
Kyalami


Joined: 10 Sep 2007
Posts: 1774
Location: North Yorkshire


PostPosted: Mon Mar 26, 2018 12:12 pm    Post subject: Reply with quote

tp81 wrote:
Thanks. Won’t be rolling the arches on the RS. Surprised


Pussy... Grin

For reference the 993 RS Cup Cars ran 10jx18" Centre-Lock Speedline Mags and they were ET60 but obviously ran big camber.

C.
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Nurburger
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PostPosted: Tue Mar 27, 2018 8:22 pm    Post subject: Reply with quote

tp81 wrote:
Thanks. Won’t be rolling the arches on the RS. Surprised


Sell your LM's & have a set of E88's built in the proper specs - the E88's are the 'correct' BBS wheel for your RS, especially when you have your clubsport bits on it.
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tp81
Suzuka


Joined: 04 Mar 2010
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Location: Glasgow

1997 Porsche 993 Carrera 2S

PostPosted: Tue Mar 27, 2018 9:04 pm    Post subject: Reply with quote

Very Happy Thumb
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Jodes
Newbie


Joined: 06 Apr 2013
Posts: 35



PostPosted: Wed Mar 28, 2018 1:24 pm    Post subject: Reply with quote

I had a look at the E88s as I absolutely love the wheel but I was put off slightly by the 3 piece design as apparently the seal can go and with the weather/water/salt on our roads they would need even more maintenance than the 2 piece LMs???

I am evidently no expert though and so this could be a load of codswallop!?!

Thanks to everyone who has contributed info so far though!
 
  
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cableguy
Kyalami


Joined: 10 Sep 2007
Posts: 1774
Location: North Yorkshire


PostPosted: Wed Mar 28, 2018 1:47 pm    Post subject: Reply with quote

Jodes wrote:
I am evidently no expert though and so this could be a load of codswallop


You're right, that is codswallop.

The face on LM's & e88's are fixed in the same way by bolts, fixed and torqued up around the outer face/lip.
The seal you mention on a three piece wheel connects the inner barrel to the face & lip. These are sealed from the factory and will cause no concern for many years to come. The only issue with the seal you mention, is if the wheel has been split and not sealed correctly by a competent wheel builder which usually results in a slow loss of air from the tyre.

Buy new or buy refurbished from a split rim specialist and you shouldn't have any issues. Thumb

C.
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Jodes
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PostPosted: Wed Mar 28, 2018 2:04 pm    Post subject: Reply with quote

I was happy thinking that was a good reason not to spend the extra on the E88s..... now I might have to empty the piggy bank and count my pocket money again!?!

At least I’m learning things from this thread other than the future value of a 993 is between £25k & £2.5m thumbsup
 
  
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richbrowne
Silverstone


Joined: 01 Feb 2008
Posts: 119
Location: Wiltshire, UK


PostPosted: Fri Sep 28, 2018 10:14 pm    Post subject: Reply with quote

cableguy wrote:
Jodes wrote:
Thanks chaps.... my small little brain doesn’t really understand offsets!

ET50 seems to be the only option available for the rear so presumably people are all using spacers!?!


One option is go for BBS e28's as these are generally available in a greater array of offsets.

Regarding LM's there are a couple of options:

Option 1 - Stick with the ET50 and add a 10mm/15mm hubcentric spacer. Remember that the C2S WB was supplied from the factory on 17" Cup 2's and a 31mm rear spacer. Wink

Option 2 - My personal favourite... Reverse mount the centres. This gives a greater dish and reduces the offset by 12-16mm, which is pretty much exactly where you need to be for the WB. Win Win...

C.


Yep, when reverse mounted the LMs will not require spacers for a 993 2S. thumbsup
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