Quick question about tyre sizes
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Quick question about tyre sizes
I know it sounds a stupid question and I feel embarrassed about writing it and I couldn’t think of a decent title for the thread.
But Im having my 2004 WRX remapped on Friday and Im having my wheels refurbed/painted tomorrow, the question is that I have 225/40/18 tyres on at the moment with the alloys that are going to be refurbed and wont be back until Monday.
Now I have a set of 18inch wheels with tyre size 215/35/18 that will go on as a replacement until my wheels come back Monday, The question is will the different tyre size affect anything on the rolling road when I have it remapped.
Sorry for the stupid question, but hopefully someone can answer it.
But Im having my 2004 WRX remapped on Friday and Im having my wheels refurbed/painted tomorrow, the question is that I have 225/40/18 tyres on at the moment with the alloys that are going to be refurbed and wont be back until Monday.
Now I have a set of 18inch wheels with tyre size 215/35/18 that will go on as a replacement until my wheels come back Monday, The question is will the different tyre size affect anything on the rolling road when I have it remapped.
Sorry for the stupid question, but hopefully someone can answer it.
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Shouldn't affect the mapping.
The actual road speed will be different, but as the car calculates this from a gearbox output, it will not affect the mapping anyway.
It will add a (further) element of overreading to your speedo though, so you won't be going as fast as indicated, as for a given number of rotations of the wheel, the travelled distance will be less, as the rolling radius will be smaller on the tyre (because you have a narrower tyre, and a lower profile).
The actual road speed will be different, but as the car calculates this from a gearbox output, it will not affect the mapping anyway.
It will add a (further) element of overreading to your speedo though, so you won't be going as fast as indicated, as for a given number of rotations of the wheel, the travelled distance will be less, as the rolling radius will be smaller on the tyre (because you have a narrower tyre, and a lower profile).
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