Is there an inherent difference between a 91v rft vs 91v non rft?
I know rft's are stronger, but 91v means it still shouldn't be loaded above 1356 pounds right?
Why is the 2009 335i convertible riding 91 load index oem tires? and if my car is lighter, can I run 91 load too?
I noticed on the 2009 bmw 3 series convertible, which weighs 4000 pounds curb weight, runs on 91v runflat tires.
My car is lighter than the 3 cabrio, at 3800 pounds curb weight, and the factory put on 93y 245/40r18 tires.
4600 lbs gross weight, 53/47 weight distro.
I want to downsize to 225/45r18, but most only come in 91y standard load.
door jamb does not state that I need 93 load index, and my owner's manual says to pick a tire that is more than half the gross axle weight.
I'm assuming that is 4600 x 0.53 / 2.
So the 91y tire appears to be sufficient. :dunno:
I never have any passengers, so my car is usually under 4000 pounds gross.
I know rft's are stronger, but 91v means it still shouldn't be loaded above 1356 pounds right?
Why is the 2009 335i convertible riding 91 load index oem tires? and if my car is lighter, can I run 91 load too?
I noticed on the 2009 bmw 3 series convertible, which weighs 4000 pounds curb weight, runs on 91v runflat tires.
My car is lighter than the 3 cabrio, at 3800 pounds curb weight, and the factory put on 93y 245/40r18 tires.
4600 lbs gross weight, 53/47 weight distro.
I want to downsize to 225/45r18, but most only come in 91y standard load.
door jamb does not state that I need 93 load index, and my owner's manual says to pick a tire that is more than half the gross axle weight.
I'm assuming that is 4600 x 0.53 / 2.
So the 91y tire appears to be sufficient. :dunno:
I never have any passengers, so my car is usually under 4000 pounds gross.