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UK & Ireland S2000 CommunityDiscussions related to the S2000, its ownership and enthusiasm for it in the UK and Ireland. Including FAQs, and technical questions.
Most of the reading here will tell you that if you have 18s and you lower the car, you will probably get some rubbing issues (tire to plastic wheelarch liner or, even worse, tire to wheelarch), depending on whether you've changed the rolling diameter, got the correct offsets etc.
If you have a larger rolling diameter (overall wheel size), it also puts your speedo out of sync (larger circumference, more distance travelled, lower indicated speed).
If you have the wrong offsets the wheel may stick out of the arch and look silly, or they sit too far inboard and rub on your suspension.
And as PL mentioned above you will need a geometry adjustment!
To be able to answer your question more effectively, what 18" wheels do you have?