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question about 18" RIM
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<blockquote data-quote="jaleeks23" data-source="post: 436329" data-attributes="member: 8431"><p>Bro,</p><p>Please help me understand why the size I'm using is way out... I used this site :- <a href="http://www.miata.net/garage/tirecalc.html" target="_blank">http://www.miata.net/garage/tirecalc.html</a> to do a check on which closest tyre I should use. Below shows the readings. From the readings, it shows 245/45 R17 closest to 225/55 R16 in terms of speedo, revs/mile. Thanks.</p><p></p><p>Standard stock is 225/55 R16</p><p>Sidewall: 4.9in</p><p>Radius: 12.9in</p><p>Dia: 25.7in</p><p>Circumference: 80.9in</p><p>Revs/mile: 783</p><p></p><p>New tire is 225/45 R17 (3% too fast)</p><p>sidewall: 4.0in</p><p>Radius:12.5in</p><p>Dia:25.0in</p><p>Cir:78.5in</p><p>Revs/mile:808.0</p><p></p><p>New tire is 235/45 R17 (1.6% too fast)</p><p>sidewall:4.2in</p><p>Rad:12.7in</p><p>Dia:25.3in</p><p>Cir:79.6in</p><p>Revs/mile:796.0</p><p></p><p>New tire is 245/45 R17 (0.2% too fast)</p><p>sidewall:4.3in</p><p>Rad:12.8in</p><p>Dia:25.7in</p><p>Cir:80.7in</p><p>Revs/mile:785.0</p></blockquote><p></p>
[QUOTE="jaleeks23, post: 436329, member: 8431"] Bro, Please help me understand why the size I'm using is way out... I used this site :- [url]http://www.miata.net/garage/tirecalc.html[/url] to do a check on which closest tyre I should use. Below shows the readings. From the readings, it shows 245/45 R17 closest to 225/55 R16 in terms of speedo, revs/mile. Thanks. Standard stock is 225/55 R16 Sidewall: 4.9in Radius: 12.9in Dia: 25.7in Circumference: 80.9in Revs/mile: 783 New tire is 225/45 R17 (3% too fast) sidewall: 4.0in Radius:12.5in Dia:25.0in Cir:78.5in Revs/mile:808.0 New tire is 235/45 R17 (1.6% too fast) sidewall:4.2in Rad:12.7in Dia:25.3in Cir:79.6in Revs/mile:796.0 New tire is 245/45 R17 (0.2% too fast) sidewall:4.3in Rad:12.8in Dia:25.7in Cir:80.7in Revs/mile:785.0 [/QUOTE]
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