changing to smaller winter tyre and wheels - Mercedes Benz SLK Forum

Tires, Wheels, Brakes & Suspension Discussion and information regarding tires, wheels, brakes and suspension.

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#1 Old 11-23-2014
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changing to smaller winter tyre and wheels

I am going to change the wheels and tyres soon. According to the manual recommendation, it suggest changing to 17''. My car is fitted with 18'' at the moment. Do I need to change the car computer setting when I change to smaller tyres? any idea how much will it cost to change the setting?
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#2 Old 11-23-2014
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No you don't have to change settings...as the overall diameter of the wheel/tyre will be the same within a percent or so. Essentially you are going backwards to what many do - stepping up one size; you're stepping down one (your sidewall will be taller, on a smaller rim).

eg 235/35/18 = 215/50/17 (this is just a swag, google tire/tyre ratios and there are numerous sites that will give you the correct size)

The other thing you will need, of course, is rims/wheels. Might I suggest you get matching wheels & tyres, which will permit you to rotate them season to season (sometimes you get rebates buying four of the same size). Unless you have an AMG, clearing the brake calipers is not usually an issue; narrower tyres is actually better.
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#3 Old 11-23-2014
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Yea I'll get 4 exactly same wheels and tyres exactly like the manaul suggest. Mine is a AMG style but not the AMG 55. So I take it the brakes should be fine right?
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