Yesterday I had a tire blowout. When I visited a tire shop (Costco Tire Center) afterward, the person there told me that my tires are under-rated for my vehicle. My vehicle is a Honda Accord 2002, which Costco's computer says requires a V rating. The tire that blew out has an H rating.
When I had the previous tires installed (at Sam's Club), they did not mention speed ratings. I just trusted them to do the right thing. Now Costco's rep says that my blowout is typical for an under-rated tire. Specifically, he told me that a lower speed rating means weaker sidewalls, so the chance for a blowout like this increases. He continued that my Accord's suspension is tuned for a certain speed rating, so even if I don't reach V speeds, it's still important for my tires to be V-rated.
I drive on a curvy highway twice a day, so I do a lot of turning/curving at 60-70 mph, so I can see how this might be a challenge for tire sidewalls. (The tire blew out on that highway.)
Do you agree with the claim that a lower speed rating can lead to blowouts?