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215/45/R17 87W

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Old 06-25-2009, 07:31 AM
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Default 215/45/R17 87W

I know the W refers to the speed rating but what about the 87?

For instance, could a 91 go on the car? Or even a Y or Z?
Old 06-25-2009, 07:40 AM
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That's the load index - 87

The letter (W/Y/Z etc) refers to the speed rating.
Old 06-25-2009, 07:41 AM
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87 is the load index (just a code not a measurement)
W is the speed rating (Max 168 mph)
Old 06-25-2009, 09:09 AM
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Google is your friend - Tyre Bible
Old 06-26-2009, 12:40 AM
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So is it vitally important to go with the same load rating (in this case W)?
Old 06-26-2009, 01:02 AM
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87 stands for a load rating of 545kg and W for speeds up to 168mph.
As long as you go for these ratings or higher you should be covered legally, if not, in an accident insurance and police could take a dim view.
You could use a Z rated tyre suitably rated.
Old 06-26-2009, 01:04 AM
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W is speed rating, not load rating.

87 Load rating is 545kg per tyre.
92 Load rating is 615kg per tyre.

As I see it, they make tyres for many cars, most cars are heavier than the s2000 so the load rating is far higher than needed, thus 87 will be fine I would have thought. Someone will need to clarify I'm not talking crap though
Old 06-26-2009, 01:17 AM
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Thanks for the tyre lesson folks. In spite of the laziness and ignorance that has become my hallmark.
Old 06-26-2009, 04:17 AM
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Originally Posted by Shopman,Jun 26 2009, 10:02 AM
As long as you go for these ratings or higher you should be covered legally, if not, in an accident insurance and police could take a dim view.
I always wondered how the modified and stretched Hummers get away with this. Even with the XL reinforced tyres you would have thought they would be overladen?
Old 06-26-2009, 06:19 AM
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Having a higher load rating also results in a stiffer tyre wall, hence the Goodyear GSD3 XLs are recommended for the front of the S, as they get somewhere near the stiffness of the RE050MZ.


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