I very much suspect BRP did the 2-ply tire for a couple of reasons. Weight would be one. On a light vehicle like the Spyder it is important to keep the unsprung weight to a minimum. Thicker, stiffer tires have more meat, so they weigh more. Second, they obviously desired a certain amount of sidewall flex in the tires, if you look at their recommended tire pressures. That is undoubtedly for suspension and handling reasons...although most of us run higher pressures and improve the handling with suspension mods, seeking a different level of performance than they apparemntly envisioned. All vehicles are delivered with the tires the engineers thought would do the job the way they wanted, at the price point the accountants projected. No common production vehicle I know of uses the very best, although some better ones are sometimes offered as options. The aftermarket wouldn't exist if the factories all supplied the perfect tire for every owner and application. If the Kenda doesn't suit you, so be it. Change to something else if you find something you like. That doesn't mean they are crap...just production quality tires, aimed at the masses. JMHO
