using diff sizes for tires

[nashimoto]

185 - thread width / tire width
55 - % of thread width as tire wall (height) 185x55 = 101.75
r15 - wheel radius 15"
82 - load index 475 kg
v - max speed rating 240kph

thanks mga sir, clarify ko lang, does this mean mas malapad ang 195 vs 185? di po ba mas maganda kung malapad ang gulong kasi mas stable ang takbo ng auto? yung height, yan yung sukat from the rim to the thread? yung wheel radius yan po yung sukat ng rims? thanks!