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Tyre Size Odometer Change?


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#1
avionics

Posted 05 September 2013 - 05:41 PM

avionics

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Hi ,

Wanna ask as I changed 245/15..my speedometer suppose to show more or less?

TQ
Hai m so naive.

#2
vr2turbo

Posted 10 September 2013 - 07:52 AM

vr2turbo

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QUOTE (avionics @ Sep 5 2013, 05:41 PM) <{POST_SNAPBACK}>
Hi ,

Wanna ask as I changed 245/15..my speedometer suppose to show more or less?

TQ

Change from what size? What aspect ratio are you using for 245/15?

#3
avionics

Posted 18 September 2013 - 06:04 PM

avionics

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QUOTE (vr2turbo @ Sep 10 2013, 07:52 AM) <{POST_SNAPBACK}>
Change from what size? What aspect ratio are you using for 245/15?


Sorry its 215/45/r17..
Hai m so naive.

#4
vr2turbo

Posted 19 September 2013 - 08:33 AM

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QUOTE (avionics @ Sep 18 2013, 06:04 PM) <{POST_SNAPBACK}>
Sorry its 215/45/r17..

Okay, but from what size?
If Waja 1.6, I presume is 195/60R15? Then 215/45R17 will be bigger by 1.67% in diameter, so you meter reading is off by that amount. Meter showing 100kph you are actually doing 101.6kph
If Waja 1.8 using 205/55R16, then diameter for 215/45R17 is smaller by 1.04%. Meter showing 100kph, you are actually doing 99kph