the flat'ish or roun'ish sidewall does not stand a strong statement anymore judging by the technology involve in tyre making nowadays.
if you have a chance to try between s03 [flat'ish] and re001 [round'ish], you will know there is no much difference between 2 models because of O'bead.
i think re001 on euro is more than enough, but if you drive S15, having a set of S03 will give you more fun than re001...... my 0.2 ringgit
He meant tyre shoulder, not the sidewall. I'd go for one with a squarish shoulder, after using tyres with a roundish shoulder. I preferred the squarish shoulder of the C.Drive.
RE001 has replaced the S03. You can't get S03 in smaller than 205/50 R17 anymore.
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