120/70-R21 tires are 0.47 inches (12 mm) larger in diameter than 130/60-R21 tires and the speedometer difference is 1.7%
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120/70-R23 tires are 2.47 inches (62.8 mm) larger in diameter than 130/60-R21 tires and the speedometer difference is 8.3%
Missing: 70r21 | Show results with:70r21
120/50-R21 tires are 1.42 inches (36 mm) smaller in diameter than 130/60-R21 tires and the speedometer difference is 5.2%
Missing: 70r21 | Show results with:70r21
120/65-R21 tires are 0 inches (0 mm) smaller in diameter than 130/60-R21 tires and the speedometer difference is 0.0%
Missing: 70r21 | Show results with:70r21
140/60-R21 tires are 0 inches (0 mm) smaller in diameter than 120/70-R21 tires and the speedometer difference is 0.0%
140/75-R21 tires are 2.13 inches (54 mm) larger in diameter than 130/60-R21 tires and the speedometer difference is 7.3%
Missing: 70r21 | Show results with:70r21
130/50-R21 tires are 1.02 inches (26 mm) smaller in diameter than 130/60-R21 tires and the speedometer difference is 3.8%
Sep 28, 2010 · 120mm wide tire /70% sidewall aspect x 21" rim. 120mm x 70% = 84mm 84mm bottom + 21" rim (533.4mm) + 84mm top = 701.4mm = 27.67 inches tall ...
90/70-R21 tires are 1.65 inches (42 mm) smaller in diameter than 120/70-R21 tires and the speedometer difference is 6.0%
120/60-R17 tires are 0.5 inches (12.6 mm) smaller in diameter than 130/70-R16 tires and the speedometer difference is 2.1%