500sl - 16" rims to 18" - rough ride? - Mercedes-Benz Forum

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post #1 of 3 (permalink) Old 01-03-2008, 04:52 PM Thread Starter
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Question 500sl - 16" rims to 18" - rough ride?

i figure it will be slightly worse, will it be?

'92 sl

Last edited by imosh; 01-03-2008 at 04:53 PM. Reason: didn't add the year
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post #2 of 3 (permalink) Old 01-04-2008, 10:18 AM
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Of course.

To maintain the proper rolling diameter, sidewalls must be shorter.

In addition to rough ride, you'll have increased susceptibility to wheel and tire damage and your tires will flatspot more readily when the car is parked for a few days.

It's 100% form over function unless you're planning on racing and if your racing's on the street it's still form over function.

Kent Christensen
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post #3 of 3 (permalink) Old 01-04-2008, 02:44 PM
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Originally Posted by imosh View Post
i figure it will be slightly worse, will it be?

'92 sl
Hi, imosh, welcome to the forum. Please take a moment to complete your BW online profile re: vehicle(s) and location, that information can prove to be quite helpful.

The stock tire size on your car was 225/55/16, the nominal equivalent in 18 is 245/40. A 40 profile tire will definitely increase the harshness you feel in your ride, so it may depend on (1) how good the roads are around you and (2) how much you care. You will pick up a bit of handling (more tread on the road, faster response through a shorter sidewall) but as lkchris notes, usually this is more about looks than anything else. Personally I found going to 17s was a great compromise, the ride quality barely changed and the look is a bit better (for yours that would be 245/45/17). In my experience 45-50 series is pretty much the "breaking point" for comfort, anything below that it's simply too harsh but again that is to some degree a matter of personal comfort.

Last thought, as you narrow the sidewall you also increase the odds of damaging a wheel due to road damage or debris.

Take care and enjoy the ride,

Socialism is a philosophy of failure, the creed of ignorance, and the gospel of envy; its inherent virtue is the equal sharing of misery. (Winston Churchill)
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