C63s Tire Lifetime
Newbie
Joined: Mar 2017
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C63s
Hi thanks for posting. Is that on the standard 19 x 9.5 wheels with the same geometry set up?
Interestingly I also asked this question of one of the tyre boffs at Mercedes Benz. His response was;
"You will be able to fit 275/35/19 with less than a 1mph variance at 80mph or go295/30/19 with the same result (though it will probably show slower than youare travelling)"
I simply want to go as wide as I can, with everything else remaining standard. If the 285/35 is working for you with no issues, I will give it a go.
Cheers Matt
Interestingly I also asked this question of one of the tyre boffs at Mercedes Benz. His response was;
"You will be able to fit 275/35/19 with less than a 1mph variance at 80mph or go295/30/19 with the same result (though it will probably show slower than youare travelling)"
I simply want to go as wide as I can, with everything else remaining standard. If the 285/35 is working for you with no issues, I will give it a go.
Cheers Matt
Member
Joined: May 2015
Posts: 168
Likes: 25
From: ?
nothing
Hi thanks for posting. Is that on the standard 19 x 9.5 wheels with the same geometry set up?
Interestingly I also asked this question of one of the tyre boffs at Mercedes Benz. His response was;
"You will be able to fit 275/35/19 with less than a 1mph variance at 80mph or go295/30/19 with the same result (though it will probably show slower than youare travelling)"
I simply want to go as wide as I can, with everything else remaining standard. If the 285/35 is working for you with no issues, I will give it a go.
Cheers Matt
Interestingly I also asked this question of one of the tyre boffs at Mercedes Benz. His response was;
"You will be able to fit 275/35/19 with less than a 1mph variance at 80mph or go295/30/19 with the same result (though it will probably show slower than youare travelling)"
I simply want to go as wide as I can, with everything else remaining standard. If the 285/35 is working for you with no issues, I will give it a go.
Cheers Matt
I'm not saying that going 285 in the rears is the end of the world but there should be some hesitation before making the jump. I personally would want everything done correctly and has 100% function, such as having the best contact between the tire and the road while not upsetting any of the other systems on the car.
Thread Starter
Super Member
Joined: Oct 2015
Posts: 975
Likes: 98
From: Abu Dhabi, United Arab Emirates
C63S 2016
my main concern was moving away from the factory 20 mm difference between front and rear. I didn't want to change that, that's why I went for 285 and 265, rather than 255 up front.
Super Member
Joined: Jun 2015
Posts: 643
Likes: 92
From: Houston, TX
'15 C63S
You want to maintain the percentage difference in tire diameter the same from front to rear as to not adversely affect any of the traction/skid control systems. Most of these systems work off of relative wheel speed (angular velocity) of each individual wheel, and programmed within the software will be a set difference between the front and rear tires. It knows with no tire slippage that the front tires will rotate at 'Y' angular velocity and the rear tires will rotate at '1.xx*Y' velocity. The ratio between those velocity numbers will stay constant no matter what speed the car is traveling. If that ratio changes, the systems know a wheel is slipping somewhere.
If you install tires that change this ratio, the traction/skid control systems will not operate as designed because they will not be able to accurately measure when/where this wheel slippage occurs. The system will either think a wheel is slipping when it's not, or it will not realize a wheel is slipping when it actually is losing traction.
Having the ratio be slightly different than stock should be fine, but it doesn't take much of a difference to cause issues. These systems nowadays as significantly more complex than they were just a few years ago, so keeping this ratio the same is as important as it has ever been.
Last edited by msd3075; May 16, 2017 at 10:49 AM.
Thread Starter
Super Member
Joined: Oct 2015
Posts: 975
Likes: 98
From: Abu Dhabi, United Arab Emirates
C63S 2016
I wouldn't be as worried about keeping the 20mm width difference as I would keeping the aspect ratio/tire diameter from front to rear the same.
You want to maintain the percentage difference in tire diameter the same from front to rear as to not adversely affect any of the traction/skid control systems. Most of these systems work off of relative wheel speed (angular velocity) of each individual wheel, and programmed within the software will be a set difference between the front and rear tires. It knows with no tire slippage that the front tires will rotate at 'Y' angular velocity and the rear tires will rotate at '1.xx*Y' velocity. The ratio between those velocity numbers will stay constant no matter what speed the car is traveling. If that ratio changes, the systems know a wheel is slipping somewhere.
If you install tires that change this ratio, the traction/skid control systems will not operate as designed because they will not be able to accurately measure when/where this wheel slippage occurs. The system will either think a wheel is slipping when it's not, or it will not realize a wheel is slipping when it actually is losing traction.
Having the ratio be slightly different than stock should be fine, but it doesn't take much of a difference to cause issues. These systems nowadays as significantly more complex than they were just a few years ago, so keeping this ratio the same is as important as it has ever been.
You want to maintain the percentage difference in tire diameter the same from front to rear as to not adversely affect any of the traction/skid control systems. Most of these systems work off of relative wheel speed (angular velocity) of each individual wheel, and programmed within the software will be a set difference between the front and rear tires. It knows with no tire slippage that the front tires will rotate at 'Y' angular velocity and the rear tires will rotate at '1.xx*Y' velocity. The ratio between those velocity numbers will stay constant no matter what speed the car is traveling. If that ratio changes, the systems know a wheel is slipping somewhere.
If you install tires that change this ratio, the traction/skid control systems will not operate as designed because they will not be able to accurately measure when/where this wheel slippage occurs. The system will either think a wheel is slipping when it's not, or it will not realize a wheel is slipping when it actually is losing traction.
Having the ratio be slightly different than stock should be fine, but it doesn't take much of a difference to cause issues. These systems nowadays as significantly more complex than they were just a few years ago, so keeping this ratio the same is as important as it has ever been.
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Joined: Jul 2015
Posts: 1,216
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From: SoCal
2016 C63S Sedan
It may not rub but the 265 tires on the front are not recommended with the stock 8 1/2 in rims.
this means that if you want to go up the same front and rear the largest recommended is 255 f and 275 r.
This is what I will do.
this means that if you want to go up the same front and rear the largest recommended is 255 f and 275 r.
This is what I will do.
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Super Member
Joined: Jun 2015
Posts: 643
Likes: 92
From: Houston, TX
'15 C63S
You are fine from a normal functionality standpoint, but the increased rubber width might not be giving you any performance advantage (and very well could be causing a performance disadvantage).
Just because a car with wider tires drives fine day to day does not mean those tires are optimal for better performance.
Just because a car with wider tires drives fine day to day does not mean those tires are optimal for better performance.
Thread Starter
Super Member
Joined: Oct 2015
Posts: 975
Likes: 98
From: Abu Dhabi, United Arab Emirates
C63S 2016
You are fine from a normal functionality standpoint, but the increased rubber width might not be giving you any performance advantage (and very well could be causing a performance disadvantage).
Just because a car with wider tires drives fine day to day does not mean those tires are optimal for better performance.
Just because a car with wider tires drives fine day to day does not mean those tires are optimal for better performance.
its a tradeoff really, cuz the rear view is absolutely worth the 285s
