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18X7.5” Wheel weight

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Old Nov 7, 2019 | 08:55 AM
  #1  
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2016 C300
18X7.5” Wheel weight

Anyone know what the OEM 18x7.5, 18x8.5” wheel weights are? I’m looking to upgrade my wheels on my iridium silver c300 but want to make sure that the weight of the new wheels is less than OEM.

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Old Nov 7, 2019 | 02:32 PM
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C400
it doesnt matter
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Old Nov 7, 2019 | 04:05 PM
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2015 c300 4matic with sports package
the client is always right! We can have 99% of a C63s if he has light wheels!
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Old Nov 7, 2019 | 05:02 PM
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Originally Posted by Simon Guertin
the client is always right! We can have 99% of a C63s if he has light wheels!
For the two geniuses above, I’m not looking to turn a C300 into a C63. Just wanting to ensure that I don’t put something on the vehicle for cosmetic reasons that will be a detriment to performance. Any actual answers appreciated.
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Old Nov 7, 2019 | 09:07 PM
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2015 C 300 4MATIC
Originally Posted by Sivryn
For the two geniuses above, I’m not looking to turn a C300 into a C63. Just wanting to ensure that I don’t put something on the vehicle for cosmetic reasons that will be a detriment to performance. Any actual answers appreciated.
Sorry, but your question is silly. There won't be a performance difference. I would look into Enkei MAT Forged wheels. I can't believe the prices folks pay for OEM wheels in the market place. INSANE!
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Old Nov 7, 2019 | 09:13 PM
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Originally Posted by DoorHandle_LED
Sorry, but your question is silly. There won't be a performance difference. I would look into Enkei MAT Forged wheels. I can't believe the prices folks pay for OEM wheels in the market place. INSANE!
I currently have the 18” wheels posted above. I was looking for an aftermarket set but want to ensure that whatever aftermarket wheels I get will be lighter than stock. Aftermarket weights are easy to find. OEM takes a bit more digging. I could always remove it from the vehicle but I was hoping someone might know them.
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Old Nov 8, 2019 | 01:25 PM
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Originally Posted by Sivryn
I currently have the 18” wheels posted above. I was looking for an aftermarket set but want to ensure that whatever aftermarket wheels I get will be lighter than stock. Aftermarket weights are easy to find. OEM takes a bit more digging. I could always remove it from the vehicle but I was hoping someone might know them.
it has no effect on performance. Besides, knowing the stock weight doesn't matter because in order compare, you need following information as well:

tire weight
percentage of tread remaining
balancing weight mass and location
average angle of driving surface

this are the information you need to calculate the effect of rotational mass on acceleration. Just trust us that it is insignificant.
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Old Nov 8, 2019 | 02:01 PM
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2015 c300 4matic with sports package
first thing you are going to do is put wider tires. so the overall package will weight the same!
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just get a flow formed wheel and it will be lighter. try to shoot for 20lbs/corner
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Old Nov 8, 2019 | 09:09 PM
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Originally Posted by alexasa
just get a flow formed wheel and it will be lighter. try to shoot for 20lbs/corner
Found one for sale and asked the owner to weigh it. He said it came in at over 40lbs. 20lbs is about where I want to be at. That would be a net weight savings of about 80-95lbs, which, given the rotating weight, would be around a 160-190lb reduction. I think I’ll stick with 18s. Had 19s on my Infiniti and it was a bit too aggressive for a daily driver. The lighter weight does make a noticeable difference in acceleration/ deceleration. I didn’t realize the OEM wheels were that heavy.
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Old Nov 8, 2019 | 09:59 PM
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According to this site the 7.5 is 32lbs.

https://www.rtwwheels.com/18-mercede...ed-rims-85370/
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Old Nov 8, 2019 | 10:07 PM
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Originally Posted by GreekUPS
According to this site the 7.5 is 32lbs.

https://www.rtwwheels.com/18-mercede...ed-rims-85370/
Hmm. Not sure why the different numbers. 32 is more of what I would expect for a cast Aluminum 18” wheel. Still a benefit to dropping down to 20, but not as much. Thanks for the website link. They have all the OEM wheel weights listed there.
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Old Nov 8, 2019 | 10:18 PM
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‘15 C300 4M Sport, ‘20 GLC300
Originally Posted by Sivryn
Hmm. Not sure why the different numbers. 32 is more of what I would expect for a cast Aluminum 18” wheel. Still a benefit to dropping down to 20, but not as much. Thanks for the website link. They have all the OEM wheel weights listed there.
40 lbs sounded too high so I did a little searching. Don’t think the weights are spot on on that site but close enough. For example it lists the 8.5 at 31lbs. I would think the wider wheel would be heavier.
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