Speed rating versus grip => higher isn't necessarily better

Does a higher speed rating mean faster times and more grip? Will a Y-Speed Rated (186 MPH) tire be faster and grippier then a W-Speed Rated (168 MPH) tire?

Not necessarily. Grip and performance depend on the tire's compound, bead construction and other attributes. 

A higher speed rating means the tire will deflect less at higher speeds due to the tire's circumferential reinforcement, but the tire's compound may not be grippy.

Consider the tire results of Car and Driver's comparison test from last summer.

In the dry autocross test, the fastest tire was the W-Speed Rated Kumho Ecsta XS.



Comments

Friday, December 7, 2012 by Bob Brasill

do you have a tire that is rated for 200 mph?
Friday, December 7, 2012 by cy

We don't have a tire Speed Rated above 200 MPH but we have a few tires that are Speed Rated 186+ plus. This means the tire manufacturer has rated the tire as capable of doing some unspecified rating above 186 MPH. You can identify these tires by the Y at the end of their Service Description and the fact that the Service Description is in parentheses. For example, 285/35-19 Max Performance Summer Goodyear Eagle F1 Asymmetric 2 has a (103Y) Service Description, see:

http://www.tirerack.com/tires/tires.jsp?tireMake=Goodyear&tireModel=Eagle+F1+Asymmetric+2&partnum=835YR9F1A2XLN0&vehicleSearch=false&fromCompare1=yes&affiliate=FL7

Continental makes the ContiSportContact Vmax rated for 225 MPH but this tire is no longer exported to North America, see more on these here:

http://www.conti-online.com/generator/www/de/en/continental/automobile/themes/car-tires/summer-tires/contisportcontact-vmax/contisportcontact-vmax.html

Thanks.

Cy
Monday, September 18, 2017 by Betty

Can I replace Tiguan tire 255 40 r19 With 255 49ZR 19XL
Tuesday, September 19, 2017 by Cy

Betty,

255/45-19 is larger than what we've test fit on your Tiguan so there is a risk of rubbing. Since we ship 99% of what we sell we're very conservative when we assess the risk of rubbing. So you may also want get anecdotal feedback from other Tiguan drivers at:

http://www.mytiguan.com/index.php?/forum/55-wheels-tyres-suspension-and-brakes/

Thanks. Cy

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