Weight of wheels - Mercedes Benz SLK Forum

Tires, Wheels, Brakes & Suspension Discussion and information regarding tires, wheels, brakes and suspension.

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#1 Old 1 Week Ago
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Weight of wheels

I'm considering changing my wheels, the purpose is to save unsprung weight and hopefully improve acceleration if only a little. I can't find the weight of the stock 18 inch 5 spoke wheels. Any body have any info?
Thanks, john

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I don't think you would shave off more than a few pounds from the combined weight of driver, fuel, car, car wheels etc

Sorry to pee on your bonfire but it is chasing a negligible holy grail!

More effective ways of cutting the laden weight of the car are: removing all the carpet, glove box door and other trim items, passenger seat can be removed if it is driver only.

Be sure to calculate how much fuel you need for the journey to the next gas station as this is likely to save AT LEAST 50Kg / 100LB.

Lesser benefits come from carrying the minimum of windscreen washer fluid, only wearing underwear and no shoes.

Finally, probably the most effective method by far is to Google "Jenny Craig" rather than "micro-light alloy wheels" because most of us carry 10's of LB of extra weight that we really don't need our car to have lug around, slowing us down.

(I do balk at airline check in when they are concerned about me having 7.2Kg of carry on luggage when a 120Kg obese person just waddles on nonchalantly guilt free!)
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#4 Old 1 Week Ago
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Quote:
Originally Posted by MarkChat View Post
I don't think you would shave off more than a few pounds from the combined weight of driver, fuel, car, car wheels etc



Sorry to pee on your bonfire but it is chasing a negligible holy grail!



More effective ways of cutting the laden weight of the car are: removing all the carpet, glove box door and other trim items, passenger seat can be removed if it is driver only.



Be sure to calculate how much fuel you need for the journey to the next gas station as this is likely to save AT LEAST 50Kg / 100LB.



Lesser benefits come from carrying the minimum of windscreen washer fluid, only wearing underwear and no shoes.



Finally, probably the most effective method by far is to Google "Jenny Craig" rather than "micro-light alloy wheels" because most of us carry 10's of LB of extra weight that we really don't need our car to have lug around, slowing us down.



(I do balk at airline check in when they are concerned about me having 7.2Kg of carry on luggage when a 120Kg obese person just waddles on nonchalantly guilt free!)
Finally, someone who understands my logic! Thanks, I had thought about wearing underwear, but I don't usually wear them and the leather seats get kind of sticky...

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Originally Posted by MarkChat View Post
(I do balk at airline check in when they are concerned about me having 7.2Kg of carry on luggage when a 120Kg obese person just waddles on nonchalantly guilt free!)
And then they have to take up half your seat in addition to their assigned seat because they can't fit into their assigned seat because of the over-flow

I cant help but think this should be moderated
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Surely the 'unsprung weight' of/on a vehicle refers to the wheels and suspension components only. Everything else is 'sprung weight'.
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It is not so much unsprung weight of wheels that matters, but "rotational" weight.


To accelerate a car you have to both accelerate the rotational weight, plus accelerate them in the direction of movement. Rotational weight affects accelleration performance twice!


1kg wheel weight could have the equivelent effect of 3kg sprung weight.


Unsprung weight (brake calipers, disks (rotors), suspension components and wheels) affects handling mainly as give the suspension a harder time.



So a good place to save wight is in the wheels and brake rotors, but as said only really important when squeezing the last drop of performance from the car.
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I was looking at OZ ALLEGGERITA HLT Star Silver Paint 18 inch...they weigh in at 18.5 lbs. Thoughts?

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Looks good to me. Sorta like the R172 AMG factory wheels.
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Quote:
Originally Posted by Johnkat View Post
I was looking at OZ ALLEGGERITA HLT Star Silver Paint 18 inch...they weigh in at 18.5 lbs. Thoughts?

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I have a set of those on my Honda JDM Tuner.

They look fabulous and are a good wheel.

Dennis
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A guy with an NSX (old style) dropped 7lbs off each wheel and ran 10 0-60 runs on each one, same tires. He dropped .04 sec off his 0-60. So I wouldn't go lighter wheels for acceleration, it just isn't worth it. Now if you want wider wheels too and a better look, then go for it.
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