Those are good numbers that Johnny Danger posted. Your sidewall height should be all that troubles you. Once you get under the 3" you start losing coushioning and even if that doesn't bother you it can wreak havoc on your wheels. Plus it can hurt performance. Your sidewall height can be so low and thus so stiff that your contact patch loses grip on uneven surfaces of real world street driving. It all really comes down to personal preference. Do you want the look or do you want the performance. An 18 is a good compromise of both. But then again thats just my oponion. Didn't some sports car manufacturer go with 19's on their latest models. 
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2000 New Beetle / in search of 03 986S triple black
Caractere kit seam sealed, Caractere rear wing, 1 3/4" drop on coilovers, 235/40/18 Kuhmo XS on 18x8 Millie Miglia Spider II's, H2sport spindles, H&R front Sway bar, O-bar rear torsion, VF Eng. motor mounts, G60 12# flywheel, Nuespeed P-flow intake, Forge DV, Samco IP, Custom K04 turbo and Upsolute chip, 4 bar fpr, TT 2 1/2" SS DP, 2 1/2" custom stainless exhaust no muffler, Peleguin LSD, B&M SS, Momo 14" wheel, R32 steering rack.
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