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http://s4.zetaboards.com/lexusaltezzaclub/topic/1148393/1/#new



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Speedo Calibrating With New Tyres; Hunting for ideas
Topic Started: Aug 25 2009, 08:22 PM (857 Views)
Robo
Body-Kitted
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Is the guard lining suppose to stick out like that? Think mine's a bit flatter
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RS-2ØØ
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Resident Viking
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If you don't want to trust your speedo reading under, then just look at your beloved GPS instead :P
Why bother with changing tyres at all? As they wear out the speedo will be affected again by a few %! lol
RokuSteady : Shakotan – Tsuraichi – Hippari – Onikyan : 神奈川 様式
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xnickx
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^^ You may thank me ^^
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OK done some calculating and here is what I got.

215/45/17s:
Rolling Radius - 196.3442cm
Total Diameter - 62.53cm
Sidewall Height - 9.675cm

With the 215/55/17s:
Rolling Radius - 209.8462cm
Total Diameter - 66.83cm
Sidewall Height - 11.825cm

So for every 1KM, the stock size gets 510.2 rotations where the 215/55/17s get only 476.5 rotations.

So the stock tires @ 100KPH Rotate at 510200 rotations and the 55s get 476500 rotations respectively.

That means with the larger tires, you will get approx 6.44% more distance by using the larger tires, which would then put your speedo out again, to be too slow to the actual speed and net you tickets/speed camera fines etc.

Is it really worth it?

Someone feel free to correct me if I'm wrong, my form 6 math (Level 2 NCEA) is quite limited haha
Contacting me for parts

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