Quote:
Originally Posted by sofaking
Vex, you've used opinion to validate an opinion that you've made. You haven't proven the premise that the sidewalls are deformed in such a way that the strength of the sidewall is compromised when stretching a tire.
You yourself stated that you believe that the sidewalls flex .3 inches under cornering. If we take that as a fact, then stretching .3 inches is within the design specifications of the tire. If we stretch each side by .3 inches then it would still be within the design specifications of the tire. Now we have a .6 inch stretch. I.E. a 215/40-17 could be put on a 9" wide wheel and still be within spec. Obviously this relies on another fact that you haven't proven, but in this case would the inflation of the tire not be acceptable at the factory listed pressure rating?
You've attempted to belittle, avoid the point, misdirect, and argue with a premise that is based on some assumption you've made and not proven.
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I've used professional opinion on the matter. If you don't like it provide data, hard fact, not subjective conjecture on the matter. Balls in your court.
More to the point let's look at the actuality of the situation:
Sidewall flex or more accurately stated; deflection under cornering load varies from tire to tire, this temporary load instigates the deformation and increased stress on the tire. This load also is temporary and allows the stress to be dissipated once the load is removed. If you're cornering with a stretched tire sidewall flex is removed which means you begin to affect the plastic deformation criteria of the rubber. Sidewall deflection under normal loading conditions of a proper tire are designed to remain in the elastic deformation region. That is the same region you are taking up when you stretch the tire. The more you stretch the less elastic region you have available to allow it to absorb stress. This is fact. Look at any stress strain curve if you don't believe me.
Furthermore you have yet to address the issue of proper tire inflation. Something as simple as inflating a tire should be easy to validate with data. Surely you can provide at least that much for us 'nay sayers'?