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<blockquote data-quote="astroboy" data-source="post: 350618" data-attributes="member: 4527">Ok. Let&#039;s simulate,Specification&nbsp; Sidewall&nbsp; Radius&nbsp; Diameter&nbsp; Circumference&nbsp; &nbsp; Revs/km&nbsp; Difference225/45-17&nbsp; &nbsp; &nbsp; &nbsp; 101mm&nbsp;&nbsp; 317mm&nbsp; &nbsp;&nbsp; 634mm&nbsp; &nbsp; &nbsp; &nbsp;&nbsp; 1993mm&nbsp; &nbsp; &nbsp; &nbsp; 502&nbsp; &nbsp; &nbsp; &nbsp; 0.0% (OEM SIZE)225/40-18&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 90mm&nbsp;&nbsp; 319mm&nbsp; &nbsp;&nbsp; 637mm&nbsp; &nbsp; &nbsp; &nbsp;&nbsp; 2002mm&nbsp; &nbsp; &nbsp; &nbsp; 500&nbsp; &nbsp; &nbsp; &nbsp; 0.5%235/40-18&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 94mm&nbsp;&nbsp; 323mm&nbsp; &nbsp;&nbsp; 645mm&nbsp; &nbsp; &nbsp; &nbsp;&nbsp; 2027mm&nbsp; &nbsp; &nbsp; &nbsp; 493&nbsp; &nbsp; &nbsp; &nbsp; 1.7%245/35-18&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 86mm&nbsp;&nbsp; 314mm&nbsp; &nbsp;&nbsp; 629mm&nbsp; &nbsp; &nbsp; &nbsp;&nbsp; 1975mm&nbsp; &nbsp; &nbsp; &nbsp; 506&nbsp; &nbsp; &nbsp;&nbsp; -0.9%255/35-18&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 89mm&nbsp;&nbsp; 318mm&nbsp; &nbsp;&nbsp; 636mm&nbsp; &nbsp; &nbsp; &nbsp;&nbsp; 1997mm&nbsp; &nbsp; &nbsp; &nbsp; 501&nbsp; &nbsp; &nbsp; &nbsp; 0.2%265/35-18&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 93mm&nbsp;&nbsp; 321mm&nbsp; &nbsp;&nbsp; 643mm&nbsp; &nbsp; &nbsp; &nbsp;&nbsp; 2019mm&nbsp; &nbsp; &nbsp; &nbsp; 495&nbsp; &nbsp; &nbsp; &nbsp; 1.3%275/30-18&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 82mm&nbsp;&nbsp; 311mm&nbsp; &nbsp;&nbsp; 622mm&nbsp; &nbsp; &nbsp; &nbsp;&nbsp; 1955mm&nbsp; &nbsp; &nbsp; &nbsp; 512&nbsp; &nbsp; &nbsp;&nbsp; -1.9%285/30-18&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 86mm&nbsp;&nbsp; 314mm&nbsp; &nbsp;&nbsp; 628mm&nbsp; &nbsp; &nbsp; &nbsp;&nbsp; 1974mm&nbsp; &nbsp; &nbsp; &nbsp; 507&nbsp; &nbsp; &nbsp;&nbsp; -1.0%225/35-19&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 79mm&nbsp;&nbsp; 320mm&nbsp; &nbsp;&nbsp; 640mm&nbsp; &nbsp; &nbsp; &nbsp;&nbsp; 2011mm&nbsp; &nbsp; &nbsp; &nbsp; 497&nbsp; &nbsp; &nbsp; &nbsp; 0.9%235/30-19&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 70mm&nbsp;&nbsp; 312mm&nbsp; &nbsp;&nbsp; 624mm&nbsp; &nbsp; &nbsp; &nbsp;&nbsp; 1959mm&nbsp; &nbsp; &nbsp; &nbsp; 510&nbsp; &nbsp; &nbsp;&nbsp; -1.7%245/30-19&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 74mm&nbsp;&nbsp; 315mm&nbsp; &nbsp;&nbsp; 630mm&nbsp; &nbsp; &nbsp; &nbsp;&nbsp; 1978mm&nbsp; &nbsp; &nbsp; &nbsp; 506&nbsp; &nbsp; &nbsp;&nbsp; -0.7%255/30-19&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 76mm&nbsp;&nbsp; 318mm&nbsp; &nbsp;&nbsp; 636mm&nbsp; &nbsp; &nbsp; &nbsp;&nbsp; 1997mm&nbsp; &nbsp; &nbsp; &nbsp; 501&nbsp; &nbsp; &nbsp; &nbsp; 0.2%265/30-19&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 80mm&nbsp;&nbsp; 321mm&nbsp; &nbsp;&nbsp; 642mm&nbsp; &nbsp; &nbsp; &nbsp;&nbsp; 2016mm&nbsp; &nbsp; &nbsp; &nbsp; 496&nbsp; &nbsp; &nbsp; &nbsp; 1.2%275/30-19&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 82mm&nbsp;&nbsp; 324mm&nbsp; &nbsp;&nbsp; 648mm&nbsp; &nbsp; &nbsp; &nbsp;&nbsp; 2034mm&nbsp; &nbsp; &nbsp; &nbsp; 492&nbsp; &nbsp; &nbsp; &nbsp; 2.1%285/25-19&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 71mm&nbsp;&nbsp; 313mm&nbsp; &nbsp;&nbsp; 625mm&nbsp; &nbsp; &nbsp; &nbsp;&nbsp; 1964mm&nbsp; &nbsp; &nbsp; &nbsp; 509&nbsp; &nbsp; &nbsp;&nbsp; -1.5%225/30-20&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 68mm&nbsp;&nbsp; 322mm&nbsp; &nbsp;&nbsp; 643mm&nbsp; &nbsp; &nbsp; &nbsp;&nbsp; 2020mm&nbsp; &nbsp; &nbsp; &nbsp; 495&nbsp; &nbsp; &nbsp; &nbsp; 1.4%235/25-20&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 59mm&nbsp;&nbsp; 313mm&nbsp; &nbsp;&nbsp; 626mm&nbsp; &nbsp; &nbsp; &nbsp;&nbsp; 1965mm&nbsp; &nbsp; &nbsp; &nbsp; 509&nbsp; &nbsp; &nbsp;&nbsp; -1.4%245/25-20&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 61mm&nbsp;&nbsp; 315mm&nbsp; &nbsp;&nbsp; 630mm&nbsp; &nbsp; &nbsp; &nbsp;&nbsp; 1981mm&nbsp; &nbsp; &nbsp; &nbsp; 505&nbsp; &nbsp; &nbsp;&nbsp; -0.6%255/25-20&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 64mm&nbsp;&nbsp; 318mm&nbsp; &nbsp;&nbsp; 636mm&nbsp; &nbsp; &nbsp; &nbsp;&nbsp; 1996mm&nbsp; &nbsp; &nbsp; &nbsp; 501&nbsp; &nbsp; &nbsp; &nbsp; 0.2%265/25-20&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 66mm&nbsp;&nbsp; 320mm&nbsp; &nbsp;&nbsp; 640mm&nbsp; &nbsp; &nbsp; &nbsp;&nbsp; 2012mm&nbsp; &nbsp; &nbsp; &nbsp; 497&nbsp; &nbsp; &nbsp; &nbsp; 1.0%275/25-20&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 69mm&nbsp;&nbsp; 323mm&nbsp; &nbsp;&nbsp; 646mm&nbsp; &nbsp; &nbsp; &nbsp;&nbsp; 2028mm&nbsp; &nbsp; &nbsp; &nbsp; 493&nbsp; &nbsp; &nbsp; &nbsp; 1.8%285/25-20&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 71mm&nbsp;&nbsp; 325mm&nbsp; &nbsp;&nbsp; 650mm&nbsp; &nbsp; &nbsp; &nbsp;&nbsp; 2044mm&nbsp; &nbsp; &nbsp; &nbsp; 489&nbsp; &nbsp; &nbsp; &nbsp; 2.6%225/25-21&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 56mm&nbsp;&nbsp; 323mm&nbsp; &nbsp;&nbsp; 646mm&nbsp; &nbsp; &nbsp; &nbsp;&nbsp; 2029mm&nbsp; &nbsp; &nbsp; &nbsp; 493&nbsp; &nbsp; &nbsp; &nbsp; 1.8%235/25-21&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 59mm&nbsp;&nbsp; 325mm&nbsp; &nbsp;&nbsp; 651mm&nbsp; &nbsp; &nbsp; &nbsp;&nbsp; 2045mm&nbsp; &nbsp; &nbsp; &nbsp; 489&nbsp; &nbsp; &nbsp; &nbsp; 2.6%245/25-21&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 61mm&nbsp;&nbsp; 328mm&nbsp; &nbsp;&nbsp; 656mm&nbsp; &nbsp; &nbsp; &nbsp;&nbsp; 2061mm&nbsp; &nbsp; &nbsp; &nbsp; 485&nbsp; &nbsp; &nbsp; &nbsp; 3.4% (OUT!!)Where&#039;s our speedo sensor? Gearbox? or drive by wire, using our DSC wheel revolution sensor to determine our speed/odo? If its like JDM, its at the gearbox, so only the driving (not steering) wheel size will affect the speedo/odo. FWD, then its front wheel size. RWD, then its rear wheel size, that will affect our speedo/odo reading.Once your odo is affected, the FC calculation and oil change interval differs accordingly, base on the above percentage.</blockquote>

[QUOTE="astroboy, post: 350618, member: 4527"] Ok. Let's simulate, Specification Sidewall Radius Diameter Circumference Revs/km Difference 225/45-17 101mm 317mm 634mm 1993mm 502 0.0% (OEM SIZE) 225/40-18 90mm 319mm 637mm 2002mm 500 0.5% 235/40-18 94mm 323mm 645mm 2027mm 493 1.7% 245/35-18 86mm 314mm 629mm 1975mm 506 -0.9% 255/35-18 89mm 318mm 636mm 1997mm 501 0.2% 265/35-18 93mm 321mm 643mm 2019mm 495 1.3% 275/30-18 82mm 311mm 622mm 1955mm 512 -1.9% 285/30-18 86mm 314mm 628mm 1974mm 507 -1.0% 225/35-19 79mm 320mm 640mm 2011mm 497 0.9% 235/30-19 70mm 312mm 624mm 1959mm 510 -1.7% 245/30-19 74mm 315mm 630mm 1978mm 506 -0.7% 255/30-19 76mm 318mm 636mm 1997mm 501 0.2% 265/30-19 80mm 321mm 642mm 2016mm 496 1.2% 275/30-19 82mm 324mm 648mm 2034mm 492 2.1% 285/25-19 71mm 313mm 625mm 1964mm 509 -1.5% 225/30-20 68mm 322mm 643mm 2020mm 495 1.4% 235/25-20 59mm 313mm 626mm 1965mm 509 -1.4% 245/25-20 61mm 315mm 630mm 1981mm 505 -0.6% 255/25-20 64mm 318mm 636mm 1996mm 501 0.2% 265/25-20 66mm 320mm 640mm 2012mm 497 1.0% 275/25-20 69mm 323mm 646mm 2028mm 493 1.8% 285/25-20 71mm 325mm 650mm 2044mm 489 2.6% 225/25-21 56mm 323mm 646mm 2029mm 493 1.8% 235/25-21 59mm 325mm 651mm 2045mm 489 2.6% 245/25-21 61mm 328mm 656mm 2061mm 485 3.4% (OUT!!) Where's our speedo sensor? Gearbox? or drive by wire, using our DSC wheel revolution sensor to determine our speed/odo? If its like JDM, its at the gearbox, so only the driving (not steering) wheel size will affect the speedo/odo. FWD, then its front wheel size. RWD, then its rear wheel size, that will affect our speedo/odo reading. Once your odo is affected, the FC calculation and oil change interval differs accordingly, base on the above percentage. [/QUOTE]

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