How to upgrade and modification of the tire

Current market popular tire upgrade in two ways: one is the same as with the original equipment tire size choice, but a higher level, better performance tire brands (ie quality upgrade),racing coilovers such as Michelin, Goodyear and Dunlop brands. Another is to upgrade (ie specification upgrade) tire size, simply put, is to widen the tire tread, tire inner diameter or greater, or both.
For the first upgrade method, you simply go to a professional tire shop or access to major tire brands website, or call another major tire manufacturers Tel (Tel see 93 at the end of table). We focus on the second upgrade, the most important principle is to the outer diameter of the tire under almost the same circumstances, the expansion of the inner diameter of the tire tread or widen. Should upgrade the entire difference in diameter (OD) with the original tire diameter (OD) of data after the upgrade do tire specifications must be controlled within 3%.
With specifications for the 185/60 R14 tires, for example. Rim diameter: 14 inches (355.6 mm). Sidewall height: 185 × 0.6 = 111 mm. Because each wheel has a sidewall height, so the total height of the sidewall 111 × 2 = 222 mm. Tire Diameter: 355.6 + 222 = 577.6 mm.
If you want to change into specifications for 195/50 R15 tires,Connecting Rods can it? Rim diameter: 15 inches (381 mm). Sidewall height: 195 × 0.5 = 97.5 mm. Because each wheel has a sidewall height, so the total height of the sidewall of 97.5 × 2 = 195 mm. Tire Diameter: 381 + 195 = 576 mm. Specifications for the 185/60 R14 tire with a tire size of 195/50 R15 compared to the diameter difference: 577.6-576 = 1.6 mm, the diameter difference ratio: 1.6 /577.6=0.27%, within 3% of the allowable range, so you can use.