Winter Tires (Only 2 needed for RWD?) - Page 3 - Mercedes-Benz Forum

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post #21 of 23 (permalink) Old 11-08-2009, 10:36 AM
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Originally Posted by lkchris View Post
General is owned by Continental and is one of its "B" brand tires, just as BF Goodrich is a Michelin "B" brand and Dunlop is a Goodyear "B" brand and Firestone is a Bridgestone "B" brand. These tires are sold on price.

I looked up General Altimax at the manufacturer website and note that all sizes are "Q" speed rated, something of course NOT approved by Mercedes--Q is the lowest speed rating there is.
Q is not the lowest speed rating, (L,M,N and P are all lower) but is a very common speed rating for studless winter tires. Yup, you can get S, T and H rated studless winter tires. But Q is still speed rated well above any legal limit in the U.S. (99MPH).

It is interesting that while many dealer will NOT install summer tires with a speed rating lower than the original spec, I have never seen or heard of this being the case for studless or studded winter tires.

Currently I'm running Q rated Blizzaks on my 420 and have no concern about them. In fact last week at the local mercedes dealer they had Blizzaks on display, same as mine and guess what Q (99 MPH) and R (103MPH) rated.


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post #22 of 23 (permalink) Old 07-25-2010, 08:28 AM
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ok, 4 winter tires are better than 2 winter tires. of course.

the question is really: are 2 winter tires better than 0 winter tires (using the all-season tires), especially on a RWD car? do they get one, say, 75% of the performance of 4 winter tires, or do they actually make things worse?
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post #23 of 23 (permalink) Old 07-25-2010, 09:44 AM
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Originally Posted by iaw4 View Post
ok, 4 winter tires are better than 2 winter tires. of course.

the question is really: are 2 winter tires better than 0 winter tires (using the all-season tires), especially on a RWD car? do they get one, say, 75% of the performance of 4 winter tires, or do they actually make things worse?
You could argue that two snow tires can make things worse, because they'll get you up to speeds too fast for your braking ability with all-season tires on the front. If your drive wheels are slipping, that's good tactile feedback that your tires are inadequate for the conditions. If you don't have that you may overdrive your equipment.
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