How do I use the tire calculator? Tire calculator is a tool for calculating the diameter of automobile tires. It is convenient to calculate the outer diameter of automobile tires according to tire specifications. After a long time of use, you need to change the tire for your car, but many people often don't know what type of tire to replace. At this time, the tire calculator comes in handy. Let's take a look
How do I use the tire calculator
How to upgrade the car tires properly when refitting the car? This puts forward higher requirements for refitting personnel. Before upgrading the car tires, first confirm what specifications and models the car tires can be upgraded to. A principle to be followed here is that the difference ratio between the upgraded tire diameter and the original tire diameter must be controlled within 3%.
1. Instructions for use
The left drop-down menu is the original tire size, and you can select tread width, flat ratio and hub size; The drop-down menu on the right is the new tire size. You can select tread width, flat ratio, hub size and speed grade; After selecting the lower tire, it will show the corresponding effect, which can be intuitively compared before and after the change; Note: if the total circumference of the new tire changes, it will affect the actual speed, and there will be a speed change range below. Different from the original tire, new tire tread width 155 185 flattening 35 50 hub size 15 17 speed level 0 s tire size has an impact on adhesion, fuel consumption, noise, comfort, etc., so we should choose the size suitable for our own needs when selecting tires and refitting tires.
2. Examples
Take 185 / 60R14 tire as an example. Rim diameter: 14 inches (355.6mm). Sidewall height: 185 & times; 0.6＝111mm。 Because there is a sidewall height above and below the rim, the total sidewall height is 111 & times; 2＝222mm。 Tire diameter: 355.6 + 222 ＝ 577.6mm.
(1) If you want to change to a 195 / 50r15 tire, is it OK? Rim diameter: 15 inches (355.681 mm). Sidewall height: 195 & times; 0.5＝97.5 mm。 Because there is a sidewall height above and below the rim, the total sidewall height is 97.5 & times; 2＝195mm。 Tire diameter: 355.681 + 195 = 576mm. The diameter difference between 185 / 60R14 and 195 / 50r15 tires is 577.6-576 = 1.6 mm, and the diameter difference ratio is 1.6 / 577.6 = 0.27%, which is within the allowable range of 355.6%.
(2) If you only want to widen the tread, but don't want to change the aspect ratio of the tire, that is, choose the tire with specification 195 / 60R14, is it OK? Rim diameter: 14 inches (355.6 mm). Sidewall height: 195 & times; 0.6＝117 mm。 Because there is a sidewall height above and below the rim, the total sidewall height is 117 & times; 2＝2355.64mm。 Tire diameter: 355.6 + 2355.64 = 589.6. Compared with 195 / 60R14, the diameter difference of 185 / 60R14 is 589.6-577.6 = 12 mm, and the diameter difference ratio is 12 / 589.6 = 2%, which is within the allowable range of 355.6%, but it is close to the limit value. Because the diameter of the tire changes greatly, after upgrading the tire, be sure to check whether the tire will rub or collide with the wheel lining, and the cushioning factor of the shock absorber should be taken into account. Generally, the tire upgrading shall follow the principle of not changing the wheel outer diameter or only changing the wheel outer diameter very little.