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  #16  
Old 11-28-2009, 11:22 AM
patbob's Avatar
Its a Whatsit
 
Join Date: Oct 2006
Location: Portland, OR
Posts: 839
Dunno about MB specifically, but on our SUV the GVW is different front-to-rear. I ran some numbers for it and, taking into account the contact patch needed to support that weight at that pressure, the front and rear ended up having the identical rolling radius. My calcs certainly are not correct since I'm no tire expert, but they were enough to convince me of why they make such specs.

Also, even a degree of more or less forward tilt alters the geometery enough to change the handling and steering of a vehicle.

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  #17  
Old 11-28-2009, 11:33 AM
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Join Date: Apr 2007
Location: UK
Posts: 357
>>I run higher tire pressures than MB reccomends

As long as you keep the rear pressure higher, i.e., maintain or even increase the differential, then, you'll be OK. In some of their handbooks, MB even recommend some higher pressures for improving economy, but at the expense of comfort - still keeping the rears at higher pressure than the front though.

Higher pressure in the front tyres of an MB is plain wrong, and not particularly safe.

An MB is not like a front wheel drive Euro-box where the weight on the front axle is much higher than that on the rear - the pressure regime for those cars is different, again, for good reasons.
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  #18  
Old 11-28-2009, 12:57 PM
Craig
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Quote:
Originally Posted by R Leo View Post
Show me someone that gets a rear alignment on a 115-123-126, and I'll show you someone that got ripped off...big time.

Can't be done by mere mortals.
The rear can't be aligned, but the alignment should be checked to make sure nothing is bent. The specified "total toe" for the rear of the W123 is 0.17 to 0.67 degrees.

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