The tire size for the 21" SE wheels are 245/40R21 and 275/35R21 which is a 28.6" tire. If you want that same size for a 20" wheel and depending on wheel width I'd go 245/45R20 and 275/40R20.
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2014 1LE - Sold
2014 Z/28 #99008 CTF SIM
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