42, The meaning of life
Join Date: Jul 2009
Location: Melbourne, Australia
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|1,6,7,8 - Series and Mini Cooper General Chat related to models that do not fit into particular categories above. Please try to put your discussion in more appropriate sections. This section does cover the 1 Series, MINI Cooper and 8-Series vehicles: BMW 830i, BMW 840Ci, BMW 850i, BMW 850Ci, BMW 850CSi, M8, Alpina B12, BMW CS Concept and others.|
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My front are 8j on which I have 235/50 ZR
My rear are 9j on which I have 285/40 ZR
Here's a good website for you to play around with: Wheel / tire size calculator / comparer - WHEELSMASTER
Torque, you are 100% right. That is a really good web site. I have saved that for later reference. Can anyone tell me what the standard offset is on the E38 rims?
It looks like I can go from the stock 235/60-16 to a 255/55-16 tyre without dramatically altering the speedometer calibration or undue distortion of the sidewalls.
Basically if you start putting 17" or 18" rims on your speedo will read higher than what your actually doing +/- will vary dependent on what rim size you put on, example 100mph will be 97mph on the clock, as your car has been calibrated for 16" so if you require the correct reading on your speedo for 18" its off to BMW dealer for re-calibration or a sat nav with speed monitor. But to be honest most people dont bother....so you buy a car with 18" rims on without knowing theyve been changed from 16" so your speedo is out, but you wouldnt know, so imagine if you went to 21".....but I wouldnt really worry....as for the DSC this will not be affected..
I am not sure if I am asking the question correctly. I'll rephrase it at the risk of having you say, see previous response
If for example you have 275/40-18 on the rear and 245/40-18 on the front, will the difference (~24mm) between the two rolling diameters having any impact on the operation or effectiveness of the DSC?
Sorry if this is what you have answered above.
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