95 e320 convertable - Mercedes-Benz Forum

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post #1 of 13 (permalink) Old 03-26-2010, 01:38 PM Thread Starter
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95 e320 convertable

does any one have experience in upgrading tires and wheels on a e320 convertable - i am very concerned about impact memory shake after hitting a road input. Currently I have the original stock tires and wheel size - I want to upgrade the wheel diameter to modernize the look but I do not want to degrade the ride - i am a new member and I am requesting your assistance
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post #2 of 13 (permalink) Old 03-26-2010, 02:16 PM
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impact memory shake
huh?
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post #3 of 13 (permalink) Old 03-26-2010, 03:05 PM
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Originally Posted by kevin okeefe View Post
does any one have experience in upgrading tires and wheels on a e320 convertable - i am very concerned about impact memory shake after hitting a road input. Currently I have the original stock tires and wheel size - I want to upgrade the wheel diameter to modernize the look but I do not want to degrade the ride - i am a new member and I am requesting your assistance
Going to a large wheel diameter, e.g. 16" to 17" etc. will increase the ride "stiffness". That is you will get more road feedback. No way around it, it is basic physics, the lower sidewall height means less shock absorption from the tire carcass and less air volume in the tire to act as a spring. Countering that, you may notice an increase in cornering responsiveness.

that said, going up 1" on your car from 15" to 16" or 16" to 17" won't likely be a big difference in ride stiffness. Going to 18" or 19" will be much more noticeable and maybe objectionable to you.

Lower profile tires, (which you'll end up with going to a larger diameter wheel) also are more suseptible to damage from potholes.


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post #4 of 13 (permalink) Old 03-26-2010, 04:58 PM
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Your car is either a W124 chassis or a W210 chassis (I couldn't tell--there appears to be a model year overlap in 1995). There are forums on this site for both of them. The folks who visit those forums own cars like yours and can be a great help in your decision to change wheels and tires.

Good luck.

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post #5 of 13 (permalink) Old 03-26-2010, 07:04 PM
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i am very concerned about impact memory shake after hitting a road input.
Are you a robot or what?
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post #6 of 13 (permalink) Old 03-27-2010, 01:32 PM Thread Starter
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impact memory shake is the response the vehicle frame experiences when the car hits (impacts) a pot hole. The length and severity that the frame shakes is Impact memory shake - Thank you for the advice on wheel size. I am aware of the effects of wheel size. the issue is more pronounced in a convertible. I will check one of the chassis specific forums for anyone who has actually changed tire/ wheel on a E320 convert. Thanks again I am new to posting on the forum
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post #7 of 13 (permalink) Old 03-27-2010, 03:00 PM
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I just did a Google search on "impact memory shake." The only hit points directly back here. Where did you first encounter this term?
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post #8 of 13 (permalink) Old 03-27-2010, 04:43 PM
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I just did a Google search on "impact memory shake." The only hit points directly back here. Where did you first encounter this term?
Kevin:

One of the things you are discovering about this site is there are lots of people who know a great deal about automobiles in general and Mercedes Benz automobiles specifically. While they/we are sometimes wrong, and while they/we often disagree, they/we get on somebody we think is trying to blow smoke up our skirts like a pack of dogs on a three-legged cat.

It's hardly ever safe to assume you know more than everybody else in here.

Not saying that's what you're doing, but your use of the term "impact memory shake" has us curious where you got it, since the usual search engine can't seem to find its use anywhere but here.

Help us out--and welcome to the forum.

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post #9 of 13 (permalink) Old 03-27-2010, 06:12 PM
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I just did a Google search on "impact memory shake." The only hit points directly back here. Where did you first encounter this term?
He first encountered it when he made it up to post on this forum. There is no such thing as this term. Why he couldn't just say 'when I hit a pot hole, the frame shakes'.......... I have no idea.
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post #10 of 13 (permalink) Old 03-28-2010, 10:05 AM Thread Starter
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I apologize if I seemed to have been blowing smoke - it was not my intent - I do not need any ego boost - I am simply trying to get basic information from considerate E320 convert owner who may have experience concerning this question. I understand infinitely the effects of tire and wheel combinations but nothing replaces actual human experience.
In respect to the question where did this term come from - it is used by chassis ride engineers to describe the affects on the occupants/ frame of a vehicle after it continues to proceed through a pot hole or over a bridge abutment etc.. It is an internal industry term and it was an automatic expression. If I return to this site I will use more common layman terms - sorry

I thank everyone for your input . I unfortunately in my newbie entrance to this site I used a term that is not common and is a specialty expression .
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