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The BMW Range
3 Series
E90, E91, E92, E93
e90 325i Tyres
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<blockquote data-quote="astroboy" data-source="post: 333023" data-attributes="member: 4527"><p>Very easy to check.. the side wall or series of whether 45 or 40 is a ratio or percentage over the width of the tyres.</p><p></p><p>So,</p><p></p><p>Front: 45 series 225 = 225mm x 45% = 101.25mm (502 Rev/km)</p><p>Rear: 40 series 255 = 255mm x 40% = 102mm (501 Rev/km)</p><p></p><p>Now if you listen to the SC and use 40 series 225 for your front, 225mm x 40% = 90mm, meaning your front tyre would be 102-90=12mm thinner. (520 Revs/km)</p><p></p><p>At least the 225/45R17 and 255/40R17 only gives u a negligible 0.75mm in difference, which of course is a lot more acceptable.</p></blockquote><p></p>
[QUOTE="astroboy, post: 333023, member: 4527"] Very easy to check.. the side wall or series of whether 45 or 40 is a ratio or percentage over the width of the tyres. So, Front: 45 series 225 = 225mm x 45% = 101.25mm (502 Rev/km) Rear: 40 series 255 = 255mm x 40% = 102mm (501 Rev/km) Now if you listen to the SC and use 40 series 225 for your front, 225mm x 40% = 90mm, meaning your front tyre would be 102-90=12mm thinner. (520 Revs/km) At least the 225/45R17 and 255/40R17 only gives u a negligible 0.75mm in difference, which of course is a lot more acceptable. [/QUOTE]
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