Tire and brake condition after 6700 miles
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From: Philadelphia, PA (USA)
2025 E53 Hybrid
Tire and brake condition after 6700 miles
After 6,700 miles the tread depth is 8.5/32" on the front tires and 8.0/32" on the rear tires. This wear rate works out to about a 25,000 mile life for the tires. I may not make it to 25,000 miles if I decide to change the tires before next Winter.
I was pleasantly surprised to find that there is no measurable wear on the front rotors. The 370mm rotors are from a W223 S-class (PN: 223-421-42-00) and I suspect the calipers and brake pads are also shared with the W223 S-Class. The minimum thickness for the front rotors is 34mm and the measured thickness at 6,700 miles is 35.99mm. The brake recuperation is going to extend the life of the rotors and pads beyond what S-Class owners experience. The friction material on the front pads is 11.5mm thick. I am assuming that it is about 12mm when new. There is virtually no brake dust on the E53 wheels.
I think the rotors and pads could easily make it to 100,000 miles, especially if Lane Keep Assist is turned off.
I was pleasantly surprised to find that there is no measurable wear on the front rotors. The 370mm rotors are from a W223 S-class (PN: 223-421-42-00) and I suspect the calipers and brake pads are also shared with the W223 S-Class. The minimum thickness for the front rotors is 34mm and the measured thickness at 6,700 miles is 35.99mm. The brake recuperation is going to extend the life of the rotors and pads beyond what S-Class owners experience. The friction material on the front pads is 11.5mm thick. I am assuming that it is about 12mm when new. There is virtually no brake dust on the E53 wheels.
I think the rotors and pads could easily make it to 100,000 miles, especially if Lane Keep Assist is turned off.
Last edited by LAZARU5; Mar 11, 2025 at 02:53 PM.
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2025 E53 Hybrid
I removed the passenger side rear tire to inspect the rear rotors and pads. The minimum thickness for the rear rotors is 24mm. I measured the rear rotor to be 25.86mm. The rear brake pad friction material is about 9.5mm thick. If I continue to wear the rear rotors at this rate they will make it to about 95K miles.
Both front and rear brake pads seem to be about 2mm thicker than they were on my EQS SUV. The difference is that the part numbers for rotors and pads on the EQS were specific to the EQS Sedan and SUV chassis, whereas the E53 Hybrid shares brake components with other ICE vehicles in MB's product line. Less frequent brake pad and rotor maintenance will effectively reduce the premium for the E53 Hybrid over the previous generation W213 E53.
When I had the rear wheel off the car I re-measured the tread depth. As it turns out the outer grooves are 8/32" and the inner grooves are closer to 7/32" which usually occurs when tires are overinflated. The label on the driver's door jamb specifies cold tire pressures of 38/49 psi for front/rear tires. The label on the inside of the gas cap cover specifies tire pressures of 36/45 psi for 3 occupants and 38/49 psi for 5 passengers. I lowered the tire pressure in an effort to improve ride comfort and tire wear on the rear tires.
Both front and rear brake pads seem to be about 2mm thicker than they were on my EQS SUV. The difference is that the part numbers for rotors and pads on the EQS were specific to the EQS Sedan and SUV chassis, whereas the E53 Hybrid shares brake components with other ICE vehicles in MB's product line. Less frequent brake pad and rotor maintenance will effectively reduce the premium for the E53 Hybrid over the previous generation W213 E53.
When I had the rear wheel off the car I re-measured the tread depth. As it turns out the outer grooves are 8/32" and the inner grooves are closer to 7/32" which usually occurs when tires are overinflated. The label on the driver's door jamb specifies cold tire pressures of 38/49 psi for front/rear tires. The label on the inside of the gas cap cover specifies tire pressures of 36/45 psi for 3 occupants and 38/49 psi for 5 passengers. I lowered the tire pressure in an effort to improve ride comfort and tire wear on the rear tires.
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Thats good news about Brake life. I have noticed no brake dust on the wheels although the wheels are black on my car so harder to notice. My 213 had a real brake dust problem.
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W214 E450
i have not noticed any brake dust on my E450. It has black wheels too but when I wash the car and spray the wheels, I don't see dark water rinsing off. On my W212, it was terrible with brake dust and I could clearly see it when spraying them down. The mild-hybrid E350/450 uses regenerative brakes as well to charge the 48V battery. It too may have better break pad life as a result.
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2025 E53 Hybrid
In post #2 above I forgot to include the part number for rear rotors which like the front rotors are shared with a W223 S-Class. 223-423-34-00.
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Took a short 200 mile trip over surface and highway roads and found that lowering the cold tire pressure to 36 psi front and 40 psi rear significantly improved ride comfort. I have been having second thoughts about downsizing the wheels to 19" with 245/45-R19 and 275/40-R19 tires since the side wall height with the smaller wheel size is only around a 1/4" more than the 20" tires.
Last edited by LAZARU5; Mar 16, 2025 at 09:44 AM.
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From: Tennessee
W214 E450
Took a short 200 mile trip over surface and highway roads and found that lowering the cold tire pressure to 36 psi front and 40 psi rear significantly improved ride comfort. I have been having second thoughts about downsizing the wheels to 19" with 245/45-R19 and 275/40-R19 tires since the side wall height with the smaller wheel size is only around a 1/4" more than the 20" tires.
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2019 E 450, 2016 E350 4matic (retired), 2018 Ford Edge Sport, 2008 Porsche Boxster
Took a short 200 mile trip over surface and highway roads and found that lowering the cold tire pressure to 36 psi front and 40 psi rear significantly improved ride comfort. I have been having second thoughts about downsizing the wheels to 19" with 245/45-R19 and 275/40-R19 tires since the side wall height with the smaller wheel size is only around a 1/4" more than the 20" tires.
Mathematically this is correct: As the overall circumference of the tire must remain the same, the sidewall decreases/increase 1/2" for every inch of change in the wheel size.
see: https://www.google.com/search?q=chan...hrome&ie=UTF-8
Last edited by JTK44; Mar 16, 2025 at 10:22 AM.
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GL450, E450, Porsche 718 GTS
How do I reset the TPMS? Mine is set for the values on the drivers lower pillar sticker instead of the fuel door. If I change pressures to the fuel door I get the low tire warning.
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Hopefully the same on the W214.
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From: Philadelphia, PA (USA)
2025 E53 Hybrid
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From: Philadelphia, PA (USA)
2025 E53 Hybrid
I believe for each inch increase in wheel size, for example going from 18" to 19", or 19" to 20", the sidewall decreases by 1/2" not 1/4".
Mathematically this is correct: As the overall circumference of the tire must remain the same, the sidewall decreases/increase 1/2" for every inch of change in the wheel size.
see: https://www.google.com/search?q=chan...hrome&ie=UTF-8
Mathematically this is correct: As the overall circumference of the tire must remain the same, the sidewall decreases/increase 1/2" for every inch of change in the wheel size.
see: https://www.google.com/search?q=chan...hrome&ie=UTF-8
Front sidewall height:
265/40-R20 = 265 x .40 = 106mm
255/45-R19 = 255 x .45 = 114.75mm (8.75mm = 0.344")
245/45-R19 = 245 x .45 = 110.25mm (4.25mm = 0.167")
Rear sidewall height:
295/35-R20 = 295 x .35 = 103.25mm
285/40-R19 = 285 x .40 = 114mm (10.75mm = 0.423")
275/40-R19 = 275 x .40 = 110mm (6.75mm = 0.266")
Since I was considering the narrower 19" wheels (available in the USA) with 245/45-R19 and 275/40-R19 tires I rounded the sidewall height difference to 1/4" in my previous post. I did note that the 255/45-R19 and 285/40-R19 tires could be mounted on the 9.0"/9.5" wide 19" wheels. But even those tires would be less than a 0.500" difference than the 20" tires on my car.
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Theoretically you are correct. BUT, the overall diameter for the 19" and 20" tires sizes specified for the E53 varies more than expected. The difference in sidewall height is less than the expected 0.500".
Front sidewall height:
265/40-R20 = 265 x .40 = 106mm
255/45-R19 = 255 x .45 = 114.75mm (8.75mm = 0.344")
245/45-R19 = 245 x .45 = 110.25mm (4.25mm = 0.167")
Rear sidewall height:
295/35-R20 = 295 x .35 = 103.25mm
285/40-R19 = 285 x .40 = 114mm (10.75mm = 0.423")
275/40-R19 = 275 x .40 = 110mm (6.75mm = 0.266")
Since I was considering the narrower 19" wheels (available in the USA) with 245/45-R19 and 275/40-R19 tires I rounded the sidewall height difference to 1/4" in my previous post. I did note that the 255/45-R19 and 285/40-R19 tires could be mounted on the 9.0"/9.5" wide 19" wheels. But even those tires would be less than a 0.500" difference than the 20" tires on my car.
Front sidewall height:
265/40-R20 = 265 x .40 = 106mm
255/45-R19 = 255 x .45 = 114.75mm (8.75mm = 0.344")
245/45-R19 = 245 x .45 = 110.25mm (4.25mm = 0.167")
Rear sidewall height:
295/35-R20 = 295 x .35 = 103.25mm
285/40-R19 = 285 x .40 = 114mm (10.75mm = 0.423")
275/40-R19 = 275 x .40 = 110mm (6.75mm = 0.266")
Since I was considering the narrower 19" wheels (available in the USA) with 245/45-R19 and 275/40-R19 tires I rounded the sidewall height difference to 1/4" in my previous post. I did note that the 255/45-R19 and 285/40-R19 tires could be mounted on the 9.0"/9.5" wide 19" wheels. But even those tires would be less than a 0.500" difference than the 20" tires on my car.
I calculate the sidewall height at:
Front sidewall height:
265/40-R20: 4.17 inches
245/45-R19: 4.34 inches
255/45-R19: 4.51 inches
Rear sidewall height:
295/35-R20: 4.06 inches
275/40-R19: 4.33 inches
285/40-R19: 4.48 inches
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2019 E 450, 2016 E350 4matic (retired), 2018 Ford Edge Sport, 2008 Porsche Boxster
The rolling circumference of a tire is the distance it travels in one complete revolution, calculated by multiplying the tire's diameter by 3.14 (pi).
The diameter of each wheel is:
265/40-R20: 720 mm
245/45-R19: 703 mm
255/45-R19: 712 mm
see: https://alloywheels.com/tyreCalculator
To determine rolling circumference multiply diameter by 3.14 (pi) then divide by 25.4 to convert to inches:
The rule of thumb is that the rolling diameter should be within 1%:
265/40-R20: 720 mm X 3.14 = 2260.8/25.4 = 89 inches
245/45-R19: 703 mm X 3.14 = 2207.4/25.4 = 86.9 inches
255/45-R19: 712 mm X 3.14 = 2235.7/25.4 = 88.0 inches
While the 265/40-R20 and the 255/45-R19 are within 1% of the narrower tire, 245/45-R19, the 245/45-R19 is not within 1% of the 265/40-R20.
I would suggest making sure of the different wheel sizes before ordering.
see: https://www.google.com/search?q=roll...hrome&ie=UTF-8
Just my $.02
Last edited by JTK44; Mar 16, 2025 at 02:03 PM.
