Snow Tire Diameter Difference
Thread Starter
Junior Member
Joined: Nov 2017
Posts: 50
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2018 C43
Snow Tire Diameter Difference
I'm looking at a set of snow tires off of a C63. The sizes are:
Rear: 265/35 R19 (26.34" Diameter)
Front: 225/40 R19 (26.10" Diameter)
Stocks:
Rear: 255/35 (26" diameter)
Front: 225/40 (26.1" diameter)
Will that 0.34" increase in diameter on the rear cause any issues with the 4matic system or is it able to compensate? or is it within allowable thresholds for the different in diameter?
So instead of 0.1" shorter in the rear currently it will be 0.24" taller.
Rear: 265/35 R19 (26.34" Diameter)
Front: 225/40 R19 (26.10" Diameter)
Stocks:
Rear: 255/35 (26" diameter)
Front: 225/40 (26.1" diameter)
Will that 0.34" increase in diameter on the rear cause any issues with the 4matic system or is it able to compensate? or is it within allowable thresholds for the different in diameter?
So instead of 0.1" shorter in the rear currently it will be 0.24" taller.
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This page will answer that and similar questions quite nicely:
https://tiresize.com/comparison/
https://tiresize.com/comparison/
Thread Starter
Junior Member
Joined: Nov 2017
Posts: 50
Likes: 6
2018 C43
That doesnt answer my question and I already posted those numbers in my original post. I was more hoping to find out if the 4matic system will run into problems over diameter being 0.24" higher on the rear, versus 0.1" shorter on the stock setup.
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Well, if you use that chart to compare a C43's front 225/40-19 to the rear 255/35-19, you get 0.1" diameter difference and one can guess that the systems need to allow for new tires on one end and bald tires on the other end, so there's another 0.25" ... so I'd guess "no problem."
What I suspect is happening is that, for traction control, the system establishes a reference at low speed/torque where it knows there's no slippage then uses that as the normal/baseline.
What I suspect is happening is that, for traction control, the system establishes a reference at low speed/torque where it knows there's no slippage then uses that as the normal/baseline.
Junior Member
Joined: Jul 2017
Posts: 71
Likes: 8
From: Washington, DC
2018 Mercedes AMG C43 (sold), 2025 GLC63s Coupe
I had the dealer order new tires for my car and assumed they would be the original size but they ordered different ones so I am wondering the same thing.
I now have:
245/35/19=25.8 Diamater
265/35/19=26.3 Diameter
I am concerned the half inch difference will negatively impact the car's drivetrain.
I now have:
245/35/19=25.8 Diamater
265/35/19=26.3 Diameter
I am concerned the half inch difference will negatively impact the car's drivetrain.
Thread Starter
Junior Member
Joined: Nov 2017
Posts: 50
Likes: 6
2018 C43
I had the dealer order new tires for my car and assumed they would be the original size but they ordered different ones so I am wondering the same thing.
I now have:
245/35/19=25.8 Diamater
265/35/19=26.3 Diameter
I am concerned the half inch difference will negatively impact the car's drivetrain.
I now have:
245/35/19=25.8 Diamater
265/35/19=26.3 Diameter
I am concerned the half inch difference will negatively impact the car's drivetrain.
Junior Member
Joined: Jul 2017
Posts: 71
Likes: 8
From: Washington, DC
2018 Mercedes AMG C43 (sold), 2025 GLC63s Coupe
Gave them a call to find out why and they said they couldn't order the tires in the C43 size, so ordered them in the C63 sizing. Service manager said that it won't have any negative effect on the car at all. He said there's a bit of a lee-way with the diameters. If that's the case, I would think your tire sizes are also fine.
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I had the dealer order new tires for my car and assumed they would be the original size but they ordered different ones so I am wondering the same thing.
I now have:
245/35/19=25.8 Diamater
265/35/19=26.3 Diameter
I am concerned the half inch difference will negatively impact the car's drivetrain.
I now have:
245/35/19=25.8 Diamater
265/35/19=26.3 Diameter
I am concerned the half inch difference will negatively impact the car's drivetrain.
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