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16" Rim to 17/18" Rim
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<blockquote data-quote="bimmerman" data-source="post: 59920" data-attributes="member: 126"><p>Many factors come into play my friend. I did not upgrade from 15" to 17" like you did. Mine was 16" to 17" so:</p><p></p><p>1. Your 15" rims are definately lighter than your replica 17" therefore this could be a factor for your case.</p><p></p><p>2. As for rolling circumfrance, it's probably not a factor in your case.</p><p></p><p>As for my case:</p><p></p><p>1. My 16" on 225/55/16 had a greater rolling circumfrance than my 225/45/17. Therefore after upgrading, I realised better fuel economy.</p><p></p><p>2. If I went back to 15" I could realise even better fuel economy since my 15 and 17 are of the same circumfrance and the 15" is lighter.</p><p></p><p>So, your case is weight related and mine is circumfrance related.</p></blockquote><p></p>
[QUOTE="bimmerman, post: 59920, member: 126"] Many factors come into play my friend. I did not upgrade from 15" to 17" like you did. Mine was 16" to 17" so: 1. Your 15" rims are definately lighter than your replica 17" therefore this could be a factor for your case. 2. As for rolling circumfrance, it's probably not a factor in your case. As for my case: 1. My 16" on 225/55/16 had a greater rolling circumfrance than my 225/45/17. Therefore after upgrading, I realised better fuel economy. 2. If I went back to 15" I could realise even better fuel economy since my 15 and 17 are of the same circumfrance and the 15" is lighter. So, your case is weight related and mine is circumfrance related. [/QUOTE]
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