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Bigger Tyres = more grip and slower acceleration
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Old 05 Sep 2005, 11:46 AM   #1 (permalink)
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Bigger Tyres = more grip and slower acceleration

Dear All

this is my first time on this Forum i have a Subaru Impreza that i bet you no one will ever have one like it mine is just 1.6TS and no turbo and just 95 HP and the 0-100 is in 12.6 sec
okay enough laughs please
so i just wanted to share this with you because i am looking of changing the tyres and get alloys but i heard that the wider tyres i get the slower the acceleration of my car will be? is that right
my stock is 185/70/14
i am choosing between 195/60/15 or 205/50/16
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Old 05 Sep 2005, 12:27 PM   #2 (permalink)
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Re: Bigger Tyres = more grip and slower acceleration

Hi mate welcome to the forum!

I have to say I doubt that the width of the tyre will have much effect on the acceleration.

The only thing that might do is if the rolling circumferance of the wheel is changed, which would change the gearing and make the car accelerate quicker or slower depending on which way you go.

Personally I wouldnt recommend this as you will end up making the speedo inaccurate (as I did with my MR2) and it is a bit of a pain.

You may find that swapping the alloys to lighter ones will help, as the unsprung mass on each corner will be reduced.

Hope that this helps!
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Old 05 Sep 2005, 03:38 PM   #3 (permalink)
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205/45/16 should be same circumference as your 14's

There was a site that done the calculation for you.

Wheel size will not alter your accleration as long as the circomference stays the same




Oh and welcome to trhe site fellow Impreza owner
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Old 05 Sep 2005, 04:53 PM   #4 (permalink)
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Welcome to the site hossamk

I have got some standard Subaru Impreza alloys for sell if that might interest you? They are 205/50/16's with pretty much, brand new tyres on them!!

Depending on where you live, your welcome to see what you think!
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Old 06 Sep 2005, 07:22 AM   #5 (permalink)
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Thanks

Thank you all for replying yes i got these numbers from a site plus the original user manual of my car if you can please read this part i read in a magazine and tell me if this is true or not.
“One Thing worth mentioning, which isn’t taken into account too often, is that, when you switch to wider tyres, you increase the amount of grip available. It’s okay if you’re boosting engine power considerable, because you’ll be able to overcome that extra grip. However, if your power modes are minimal or non-existent, you may want to stick to a tyre width similar to stock”
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Old 06 Sep 2005, 01:01 PM   #6 (permalink)
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Re: Thanks

Quote:
Originally Posted by hossamk
Thank you all for replying yes i got these numbers from a site plus the original user manual of my car if you can please read this part i read in a magazine and tell me if this is true or not.
“One Thing worth mentioning, which isn’t taken into account too often, is that, when you switch to wider tyres, you increase the amount of grip available. It’s okay if you’re boosting engine power considerable, because you’ll be able to overcome that extra grip. However, if your power modes are minimal or non-existent, you may want to stick to a tyre width similar to stock”
You are AWD so your grip level is very good anyway. I think that statement is flawed as more grip should mean quicker accelaration as no wheel spin.......
Take no notice..........................
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