The stock 18" Continental (non-Run-Flat) was a STIFF tire. When I upgraded to 19" Hankook V12 (don't recommend this tire) years ago, I instantly noticed a softer ride and less steering precision. Moral: Other factors are more important than 1" diameter.
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'08 Z4 ///M Coupé (#1765/1815) — 1 of 68 Sepang Bronze / Black Nappa / Madeira Wood / 1 of 1 this combo
19" Advan RS / AP Racing / Bridgestone RE-11 / Autosolutions SSK / R.E. Diablo / R.E. trans mounts
'09 X5 35d — Space Grey / Saddle Brown
20" Forgestar F14 / SCR Delete
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