Moving to 21 inches increases wheel diameter and tire width, so expect sharper steering and higher ultimate grip with a firmer, more controlled feel. You gain stance and precision and give up a little ride pliancy compared with a 20-inch setup. If you want the most planted, aggressive character and don’t mind the firmer edge, 21s deliver it. For maximum comfort, the 20-inch UP-05 package is the softer choice.
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