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Hi Guys,<P>Is anyone running 215X45X17 wheels on there S/V 40? And if yes are you having any problums? I was between 215X40X17 and 215X45X17 and was not sure the best way to go. so it never hurts to ask someone that has already done it.<P>Thanks,<BR>
 

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The tire to fit is the 215/40/17, and as mounted on a 7.5" wheel will give you an approx. 8.5" thread width, which varies by tire manufacturer, but the 8.5 will not rub, as I use a 205/55/15 Bridgestone Potenza S-03 which has a thread width of 8.6" as mounted to a 7.0" wheel. The overall diameter of both tires is 23.9", and the static loaded radius varies by only 0.1", the plus for the 17" tire, which will give one more revs/mile for the two comparisons.
 

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Can you mount 215X40X17 tires on a 17X7.5 wheel? Tirerack said I cant do that, and I do not know enough to tell them there full of it.<P>Thanks,<BR>
 

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They will fit. I fit 215/40-18 on 18X8. <P>When unsure,<BR>Do the math: 40% of 215mm= sidewall.<P><BR><p>[This message has been edited by cs40racing (edited 09-13-2002).]
 

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The tire industry pegs this tire(215/40/17) for a wheel which measures 7.0 to 8.0" in width. 7.5 is used as the "measuring size" for the specs as noted and tested. A 0.5" difference in wheel width will affect the measured tire SECTION WIDTH by 0.20" plus or minus, vs the plus or minus in the wheel width.<BR>P.S. The tire and wheel we are discussing, is an OE size for 99-01 Mercedes-Benz SL500/SL600--tell that to Tire Rack!!!!
 

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I just happened to think why Tire Rack will not sell you the 7.5" wheels--they don't have a wheel with the proper OFFSETT that will work on the S40 with your tire size. The OE S40 wheel has an offsett of 44mm, and one doesn't want to have a variance of more than 5mm in a wheel selection for a proper fit. Thus the max wheel offsett would be 39mm, but I would stay as close to the OE 44mm as possible in your selection of an after-market wheel. <P>My suggestion would be the Mille Miglia-- CELLO, which does come in the 17" wheel, but I don't know the widths--a 7.0 would work, and the design is almost the same as the new 2003 40 alloy wheel. The offsett is 41mm to my knowledge.
 
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