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That's a good question. I'm going to pose another question on top of it...how is an H rated tire different from a V rated? I realize they're the max speed ratings that the tire can hold up with for long periods of time. but...how are they constructed differently?? thicker internal walls? differently heat treated rubber? :?

You can know all the speed ratings you want, but if you don't know how or why a tire is a certain rating, then you're not as knowledgable as you think! I can swallow my pride and ask :p
 

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My 1984 Escort GT came with H rated tires. They cost $100 each and maybe lasted 25,000 miles and didn't stick to the wet roads at all (which is probably why the car had bumper guards). Now on my 1995 LX I have regular tires rated to last 70,000 miles and do OK on wet roads and I really don't notice any difference in the way the car feels.
 

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Here is what I've heard, I'm not sure how true it is. On the higher speed rated tires the sidewall get more stiff, the higher the speed rating. Less flex in the sidewall means a more firm ride. From my experience, going from a worn out H rated tire to a new Z rated tire the ride was better for about 2000 miles then (it seemed anyway) that these tires did have a more harsh ride but the handling with the z tires was way better than the H tires right from the start. Now I've gone back to an H Yokohama avid t4 and although good in the snow and rain, I really hate the sidewall flex. My Falkens were so much better in the corners it isn't even close. I knew handling would drop off some, but never thought the sidewall flex would be so bad on the same size tires. Back to z rated tires for my next set! Hope this helps some. Oh, I could run up to 44psi on my Z rated tires and only 35 psi on the H. I usually ran 40 in the Z on front 38 back and on the H tires I keep them all on 35psi.
 

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I've got H rated Toyo Proxes with a 50 series sidewall, and the ride is good. They are good in the wet, too. My brother is running H rated Kumho Ecstas with a 50 series sidewall, too, but his tires have stiffer sidewalls. His tires also give a good ride, though it is a little stiffer. He has better turn-in thanks to those sidewalls than i do, though. i'm going for the Ecstas when my Proxes wear out.
 

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I have nothing but good things to say about my Kumho Ecsta Supra 712's in the 195/55 VR15 flavor. Excellent tire. Ask me again in the winter and I'll tell you a different story of course, as these tires aren't meant for snow/ice...
 

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well i gots z rated tires...only thing i dont recommend which will degrade performance is mixing tire brands or ratings...

i got a flat tire and couldnt afford another z rated...so i have 3 zrated and 1 s rated...lolll


neway past 90, the car shakes pretty awful...and 100...well an srated is only good for about 100 so i dont go that fast nemore.
 

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Rob said:
Does ride comfort deteriorates
significantly if you switch from H to V speed
rated tires?
Rob,

Given the same size (height and width) you "should" notice a firmer ride with the V rated tired.
The speed ratings, as James almost said, is the maximum SUSTAINED speed that the tire can handle in a CONTROLLED LABORATORY TEST at a certain inflation and load. It "typically" translates into a more stiffly built tire, more-so in the bead/lower sidewall area, but under the tread as well. The stiffer construction needed for the sustained speeds also gives you quicker steering response (faster turn-in and higher limits of handling) and more road feel. Of course, once you get the tires on your car and out on the road, you are no longer in a controlled lab situation. Max speed (safely) goes out the window, as the manufacturer can't control the vehicle load, air pressure, road surface (or debris!), etc...
Regarding the "sustained speeds" comment, you might notice that drag tires usually aren't speed rated. Reason being (I'm pretty sure) isn't that the tire isn't safe over 100 MPH, but that the tire isn't designed for CONTINUOUS operation at high speed.
Similarly, any reputable tire manufacturer will "downgrade" the actual tested speed capability as a margin of safety. For example, if BFG says "This tire is rated for a max speed of 130 MPH (H)", they have probably tested the tire a level above that (when it blew apart in the test wheel) and backed it down to 130 for the max SUSTAINED speed.

I hope this helps clear up any speed rating questions anyone has. Sorry if it was a little long.

PS - 92gt5spd....get a matching Z!!! It PAINS ME TO HEAR YOU SAY THAT as I sell tires for a living!!!!!
 

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Discussion Starter · #10 ·
Hello:

Thank you very much for the responses so far.

bplech1 said:

Given the same size (height and width) you "should" notice a firmer ride with the V rated tired.
So if I go from 175/70/13 H to 205/55/15 V then what can
I expect regarding the ride comfort?

Thank you,

Rob.
 

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Rob said:
So if I go from 175/70/13 H to 205/55/15 V then what can
I expect regarding the ride comfort?

Thank you,

Rob.
With that particular Plus 2 fitment you will notice quite a firmer ride, more road feel (especially expansion joints and potholes), and "possibly" more sensitivity to tracking (following irregularities like road crown and those damn annoying ruts and undulations caused by tractor trailers!!!).

HTH

Bill
 
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