SL-Class (R231) 2013 on: Discussion on the SL550

SL/R231: Steering wheel feel loose after changing tire sizes!

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Old 06-10-2018, 06:40 PM
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R231 SL63 Amg
Steering wheel feel loose after changing tire sizes!

Hi everyone!
I just changed my car tires, rear and front. For the rear I went with 305,30,R20 ps4s and for front I have 255 35 19 psp. I feel like the car’s heights has changed also when I acclerate I feel like my steering wheel is loose!
Any idea what could be wrong? My rear tire size was 285,30,20 ... thanks
Old 06-11-2018, 09:33 PM
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Originally Posted by Bobby k
Hi everyone!
I just changed my car tires, rear and front. For the rear I went with 305,30,R20 ps4s and for front I have 255 35 19 psp. I feel like the car’s heights has changed also when I acclerate I feel like my steering wheel is loose!
Any idea what could be wrong? My rear tire size was 285,30,20 ... thanks
Didn't change wheels, just tires? Are these AMG forged wheels? 19" front/20" rear. SL450/550 or 63? If 63, the car has ABC and you could have it in raised position. If springs, the ride height cannot change. If it feel loose the tire pressure may be too high.
We have the 19"/20" setup but with standard 285's in the rear. Also PS4s and the car is very planted. With 305's the tire diameter is .5 inches larger than stock and a full 1.2" larger than the fronts. If too extreme, the ABS system may be confused but not the steering
Old 06-11-2018, 09:43 PM
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R231 SL63 Amg
Originally Posted by Wolfman
Didn't change wheels, just tires? Are these AMG forged wheels? 19" front/20" rear. SL450/550 or 63? If 63, the car has ABC and you could have it in raised position. If springs, the ride height cannot change. If it feel loose the tire pressure may be too high.
We have the 19"/20" setup but with standard 285's in the rear. Also PS4s and the car is very planted. With 305's the tire diameter is .5 inches larger than stock and a full 1.2" larger than the fronts. If too extreme, the ABS system may be confused but not the steering
it is SL63 2013, the car came with 19” in front and 20” in the rear. Front tire is the same size 255,35,19 and for rear was 285,30,20 which I changed it to 305,30,20
even though in I didn’t change the tire size on the front ,I feel like the car is higher. also I checked and the car is not on raised position! I am not sure what should I do? Is it the alignment or should I put lowering links to bring the car little a bit lower !?
Old 06-12-2018, 10:24 AM
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Originally Posted by Bobby k


it is SL63 2013, the car came with 19” in front and 20” in the rear. Front tire is the same size 255,35,19 and for rear was 285,30,20 which I changed it to 305,30,20
even though in I didn’t change the tire size on the front ,I feel like the car is higher. also I checked and the car is not on raised position! I am not sure what should I do? Is it the alignment or should I put lowering links to bring the car little a bit lower !?
Take a pic to show the height. Check tire pressure? Also i would raise and lower the car a few times while driving just to make sure that the car does what it’s supposed to. Press tye ABC display button (next to the raise button) and look at the comand screen. The indicator on the left shows the ride height. 0 is normal, +1 is raised and -1 is lowered (go 80mph to see that)...

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