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Tyre size and fuel economy

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Tyre size and fuel economy

Postby Lightning » Tue Oct 04, 2011 2:09 am

Does moving away from the factory profile and width of 215/45 affect your fuel economy or suspension? If so, how greatly are they affected? I am thinking of getting some new 17'' tyres and I am thinking of going with 205 or 215/40 as I prefer to see smaller tyres. Do I compromise anything by doing this?

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Re: Tyre size and fuel economy

Postby Noel » Tue Oct 04, 2011 2:01 pm

Honestly when most people buy a Tezza they accept poor fuel economy...

Fitting 205/40 will slightly affect the speedo reading...
Approx under read by 5% ;)

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Re: Tyre size and fuel economy

Postby E910 » Tue Oct 04, 2011 10:02 pm

Why would you want to go with a narrower or lower profile tyre? What do you intend to gain from this? Most people want to fit wider tyres which I can understand. As Noel said all it'll do is put your speedo out. 40 series will also make the gap between the guard & tyre bigger making the car look stupid/higher unless you have coilovers to wind down.
If you are still intent on changing them make sure you do all 4 or you'll end up with ABS troubles.

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Re: Tyre size and fuel economy

Postby wullie_trd » Tue Oct 04, 2011 11:57 pm

I cant see why you want to do this ..... lower profile will compromise ride comfort.

Depends what the roads are like round your way

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Re: Tyre size and fuel economy

Postby ndrk » Wed Oct 05, 2011 12:14 pm

205/40 will change final ratio (virtually). Car will launch a bit faster but your highway RPM´s will go up a bit. So you´ll lose a bit MPG-wise. Also your car will look silly.
If you want narrower tires, go with 205/50. it´s about same diameter as 215/45.

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