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  #1  
Old 03-13-2016, 02:40 PM
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CDI Tire Wear Question

When I bought my CDI, the PO had fairly new rear tires and good condition but older front tires. I had snows on for the winter, so when I installed the summer tires I rotated the ones in the rear to the front. The newer tires have 9/32 tread depth and the older ones 6/32. My assumption was that the fronts would wear faster and thus I'd be able to even out the wear.

Out of curiosity I asked the PO about buying two tires instead of four, and he said it was because of the rear tires wearing out faster (I guess he hadn't rotated as much as he might have).

I realize that the drive goes to the rear wheels...but it still surprises me that the fronts wouldn't wear out more quickly. Any of you CDI owners notice anything by way of wear patterns?
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  #2  
Old 03-13-2016, 02:46 PM
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Someone's enjoying the torque

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  #3  
Old 03-13-2016, 03:21 PM
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Just so you know, you're always supposed to have the tires with greater tread on the rear axle.
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  #4  
Old 03-13-2016, 03:26 PM
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Under normal driving, the fronts should usually wear out quicker than the rears.

Either rear suspension components are worn out or as suggested, PO was enjoying the torque in the CDI. Are the rear tires cupped by any chance?
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  #5  
Old 03-13-2016, 03:42 PM
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Quote:
Originally Posted by mannys9130 View Post
Just so you know, you're always supposed to have the tires with greater tread on the rear axle.
True....but I'd also like to even out the wear.
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06 E320 CDI "Rutherford", Black, 145k mi
91 300D "Otis", Smoke Silver, 129k mi
98 E300 "Murray", Silver, 128k mi, Stage 2 Rocketchip chip tuned, under son's care, getting EXPENSIVE!

Twelve other MB's owned and sold
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  #6  
Old 03-13-2016, 04:20 PM
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On my 05 E class wagon I typically will put a new set of tires on the back and move the ones that have worn down approximately 1/2 way to the front. Then when the front ones are worn move the rear forward and repeat. I am of the opinion that tires are cheaper and last longer on the 98 E300.
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  #7  
Old 03-13-2016, 05:38 PM
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W211 eats tires for a living, especially if alignment is bad or ball joint is worn. Doubly more so for the CDI, since it has so much torque.
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  #8  
Old 03-13-2016, 06:39 PM
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Quote:
Originally Posted by Deplore View Post
W211 eats tires for a living, especially if alignment is bad or ball joint is worn. Doubly more so for the CDI, since it has so much torque.
I have put 10K miles on the tires which were fairly new and found no strange wear pattern at all. They are wearing evenly and slowly.

Quote:
Originally Posted by mannys9130 View Post
Just so you know, you're always supposed to have the tires with greater tread on the rear axle.
I am of the opposite opinion- you want the tires which do the primary braking and steering to be the best you have- so the worse tires go on the rear. You can always speed up slower- but when you need to brake more quickly you want the best tires.
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Old 03-13-2016, 07:59 PM
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Well, that sounds like you have excellent alignment then.

Rear wear out is usually due to negative camber, or incorrect toe. In extreme case, can be affected by a shock like hitting a pothole or curb, in which case can affect the alignment.

Furthermore, if your car has airmatic (not sure CDI came with airmatic as standard), putting it in Sport II mode will wear out the tires faster.
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  #10  
Old 03-13-2016, 09:21 PM
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On rear drive cars I've had, the front and rears generally wore at about the same pace unless I was driving like a jackass.
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  #11  
Old 03-14-2016, 07:29 AM
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The rears wear out faster, and the right rear faster than the left rear.

It's annoying running directional tires, which means I'm throwing out a tire with tread left in the name of replacing in pairs, cause I can't rotate them side-to-side.
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  #12  
Old 03-14-2016, 08:40 AM
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Looks like I should probably put the good tires back in the rear, rotating left to right.
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06 E320 CDI "Benson", Platinum Blue, 175k mi
06 E320 CDI "Rutherford", Black, 145k mi
91 300D "Otis", Smoke Silver, 129k mi
98 E300 "Murray", Silver, 128k mi, Stage 2 Rocketchip chip tuned, under son's care, getting EXPENSIVE!

Twelve other MB's owned and sold
2002 Honda Odyssey 254k mi (want to name it "Homer," wife won't let me)
1961 Very Tolerant Wife
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  #13  
Old 03-14-2016, 10:16 AM
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  #14  
Old 03-14-2016, 09:03 PM
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I almost always wear out the rear tires faster. Whats the point in having 200+ hp if you're not using them all!
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  #15  
Old 03-14-2016, 09:58 PM
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Quote:
Originally Posted by MTUpower View Post
I have put 10K miles on the tires which were fairly new and found no strange wear pattern at all. They are wearing evenly and slowly.



I am of the opposite opinion- you want the tires which do the primary braking and steering to be the best you have- so the worse tires go on the rear. You can always speed up slower- but when you need to brake more quickly you want the best tires.
The tires with the best tread go in the back. The front wheels have the engine pressing down on them, and they are able to steer. Tread creates inherent "wiggle" in handling, and it's undesirable. The lower the tread, the lesser the wiggle. If you are on the edge of hydroplaning, you'll be able to steer the front wheels info the skid. If the rears lose grip, you're along for the ride.

I understand your reasoning, but test after test have shown that the best tread in the rear has provided the best handling and safety. Hope that explanation helps.
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