In the drivers manual the option listed for 18" wheels is:- 7.5J x 18 H2 Rim Offset 50 mm with 225/40 tyres 10J x 18 H2 Rim Offset 65 mm with 265/30 tyres As my 1998 C2 has the sports package, I would like to put the turbo style wheels on as someone during its life has removed the 18" wheels and put standard 17" back on. However I am finding it hard to get those exact wheel sizes above. I have seen the following for sale on ebay:- http://cgi.ebay.co.uk/4-x-18-NEW-PORSCHE-CUP-STYLE-ALLOY-WHEELS-TYRES_W0QQitemZ7999337933QQcategoryZ28648QQrdZ1QQcmdZViewItem 8.5 J x 18 Front offset 54 mm with 225/40 N2 tyres 10J x 18 Rear offset 55 mm with 285/30 N2 tyres Would this fitment be ok ?, my car does have the 030 suspension ...... need some advice. Thanks Mark
Discussion summary
YOUR RESEARCH18" Wheels - Tyres, Offsets, etc !
1 matching discussions were examined; no attributable action/outcome evidence was detected. No consensus or repair conclusion is claimed.
Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.
Read captured repliesInsufficient extracted evidence does not mean there is no answer in the original discussions.
1 matching discussions · 5 captured posts examined · 0 partial discussions
Coverage and how to read this overview
Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.
5 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
- Porsche Club GB: 1 discussions
0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.
0 acknowledgements have no verified action link; they do not establish a repair result.
Generation: 20261026T065735Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Mark I have a copy of the Porsche TSB which shows tyres, wheels, offsets, spacers etc., which confirms the rear offset of 65mm is right for your car. 55mm offset would mean that you would need 10mm spacers to get the centreline of the wheel back to the correct position. Similarly, you would need 4/5mm spacers on the front. According to the TSB, 285x30 rears are not recommended for cars prior to MY2001, but from previous threads I believe that other people are using them. It also shows details for re-working the rear wheel arches to accomodate 285's. If you would like a copy of the TSB, please email me via my profile page.
I dont think narrow bodied coupes cannot take Turbo wheels without modifiying the wheel arches
Hi Richard & Gary thanks for the information and feedback. I think I will leave that wheel and tyreset alone, and find the correct rim size and offset. Thanks again. Mark
Weird offsets: think they must be replica wheels and not Porsche OEM.
This is a source reference. Confirm exact model applicability in the original material.