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99 S600, 99 SL 600
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Discussion Starter · #1 ·
I have a 92 500SEL, and just bought a set of staggered 18 inch AMG Monoblocks. The front is 18x8 and the rear is 18x9. The tires that are on them now are 235/40/18 in the front and 265/35/18 in the rear. They came off a CL500. I have three questions that I am having a hard time finding the answers to:

1. Why are the rear tires lower profile than the front?

2. What size tires can I get (prefer a taller profile) before I will experience rubbing or have to roll my fenders? Can I go to a xxx/50/18 all around?

3.Should the rears always have a lower profile than the front when using staggered rims?

Even with the larger rim my rear wheel wells look so empty with the low profile tires. I'd like to fill up that space more without having to get larger wheels.

Thanks for any help!
 

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current fleet: 1996 s500; 1997 BMW 328ic; 2000 Nissan Frontier; 1966 AC Cobra
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279 Posts
The proper tire and wheel size is:
18x8.5 et=47 tire size = 255/45R18

The above specs are for a w140

specs for a w140 AMG are as follows: 18x8.5 et=44 tire size = 255/45R18

You can probably get other sizes to fit, but this is what MB calls for


Hope this helps
 

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SL55, 300SE, GL450, Daytona 955i
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I have a 92 500SEL, and just bought a set of staggered 18 inch AMG Monoblocks. The front is 18x8 and the rear is 18x9. The tires that are on them now are 235/40/18 in the front and 265/35/18 in the rear. They came off a CL500. I have three questions that I am having a hard time finding the answers to:

1. Why are the rear tires lower profile than the front?

2. What size tires can I get (prefer a taller profile) before I will experience rubbing or have to roll my fenders? Can I go to a xxx/50/18 all around?

3.Should the rears always have a lower profile than the front when using staggered rims?

Even with the larger rim my rear wheel wells look so empty with the low profile tires. I'd like to fill up that space more without having to get larger wheels.

Thanks for any help!
1-because this is a aspect ratio not a measurment

2-dont screw with the overall diameter of your wheels, if you are worried about damaging your rims, just keep the stock. changing the overall diameter changes the speedo and torque charachters.

3-yes, in the staggered setup, because rears are wider, thus, a smaller aspect ratio is needed to achieve the same wall hight.

your stock tires are 235/60/16 so good 18" tires are:

235/50/18 for front and 255/45/18 rear (cheaper, and less rub issues)

OR

255/45/18 front and 285/40/18 rear (better fit, but needs rear springs in perfect shape)

granted, both setups fit perfectly a brand new W140, but your car is 18 years old...
 

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Discussion Starter · #4 ·
Bayhas,

That is exactly what I was looking for. I just had the rear suspension done about 6 months ago, so I'm in good shape and will likely go with your first recommendation. Thanks so much :thumbsup:
 

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SL55, 300SE, GL450, Daytona 955i
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20s and up are not that practical for day to day driving...

none the less, best fit for 420, 500, and 600 are 255/35/20 and 265/35/20
 

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Thanks bayhas, betweek 18" and 19"?
18 is cheaper, more practical, and standarized by Merc specs. in fact, 18" monoblocks were fitted from factory on W140 with sport package and grand edition.
 
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1997 S600
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18 is cheaper, more practical, and standarized by Merc specs. in fact, 18" monoblocks were fitted from factory on W140 with sport package and grand edition.
Thanks Bayhas, I will look around for a set...but when I was looking around I found few sets, any recommendations...Pictures please...
 

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1996 S320 (Kuro) 1998 S600 (Weiss)
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18 is cheaper, more practical, and standarized by Merc specs. in fact, 18" monoblocks were fitted from factory on W140 with sport package and grand edition.

Also the road noise and ride stiffness increase tenfold with 19"/20" wheels.
 

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1985 500 SEC EURO AMG/LORINSER; 1988 560SEL, 1995 S500 Sonderschutz
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how about 265/40-18 rear?
 

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1997 S500V, 1999 S500 grand edition, 2006 s65 amg
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265/40/18 is going to be off on the cluster. You can run them. But recommend size is 275/40/18 or 285/40/18(hard to find for a decent price) i ran 305s for a week they rubbed a bit not recommended for the w140.
 

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'97 CL600
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My advice on 20" wheels? Don't do it. Ask yourself, do I want 2" of rubber on the road or 6"? That is what I have on my '97 CL600. I turned the car down the first time around because of the wheels ($7000 Lorinsers) When the PO dropped the price I contacted a local wheels shop seeing if I could make a trade for 18". No they weren't interested. Ended up buying the car however. They look great but the ride quality suffers. As long as you are on smooth pavement you are OK but lookout for bumps or other road upsets. The car also came with wider tires on the rear. The cruise control wasn't working and I found out that your wheel rotations per mile better all be close or the same. Mine were not. Tirerack.com and Discounttire.com are two good places for wheel/tire info.
Anziani
 

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96 sl600,97 s420(gone) 96 CL600
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The cruise control wasn't working and I found out that your wheel rotations per mile better all be close or the same. Mine were not. Tirerack.com and Discounttire.com are two good places for wheel/tire info.
Anziani
This. My cruise recently stopped working (actually the ASR went nuts for a bit too) when I recently replaced my worn out Pilot Sport A/S 275/40/18 with same size Conti's while leaving the Michelin's on the front-Conti's were backordered. It comes and goes, today it worked up to 60 but not above. So even a brand switch can cause a problem when you're on the edge of the permitted delta in wheel speeds.

Looking at this, my cruise didn't work above 78mph before the replacement, and I'm now thinking its because of the small difference in rotational speeds between the 255/45 fronts and the 275/40 rears; going with 245's up front on the replacements as they're a better match speedwise.
 

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The ratios have to be the same. If you have 275/40 in the rear you need 245/45 in the front. Because the wheel speed sensors will be off by 1-2% (cant remember the exact percentage) but its enough to stop cruise control. On a side a note when i bought my w210 all 4 tires were different sizes and cruise control worked. 225/45 255/40 235/40 275/35 we had to clean the inside of rims to figure out which was 18x8.5 and which was 18x9.5

I never use cruise control but it works on long drives if i need to use it. 20" are harsh and easy to bend. They look nice but are problematic.
 

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'97 CL600
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Thanks to both of you for the feedback. I had the same initial problem with the two different sized tires. CC would work up to 55MPH but not beyond until I made all tires the same size. I use CC all of the time because I live out in the boonies and spend a lot of time on the freeways.
Cruise on friends!
Anziani
 
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