How can I check a tire's label information?

You can search for tire labels through the EU database (eprel.ec.europa.eu) or Japanese sites like kakaku.com. For energy efficiency calculations in Taiwan, refer to energy.artc.org.tw.

What should I check before purchasing tires?

It is recommended to verify that the size, speed rating, and load index match your requirements exactly. Avoid tires that are not sold in the major EU or Japanese markets, or those with a Wet Grip rating lower than 'A'.

What should be the priority when choosing tires: Wet Grip, Noise, or Fuel Efficiency?

The recommended priority order is: Wet Grip > Noise > Fuel Efficiency.

How are Wet Grip ratings categorized?

Wet Grip is categorized from A to E based on the G-value, where 'A' represents the best performance. In EU standards, G ≥ 1.55 is Grade A, while G ≤ 1.09 is Grade E. Japan uses a similar 'a' to 'd' scale.

How are Fuel Efficiency ratings determined?

Ratings are based on the Rolling Resistance Coefficient (RRC). For example, in the EU, RRC ≤ 6.5 is Grade A. Japan and Taiwan use their own scales such as AAA/AA/A or A/B/C respectively.

How do I convert Mercedes-Benz tire pressure from PSI to Bar or kPa?

This article provides a Mercedes-Benz conversion table (sourced from label A205 584 70 11). It allows for easy conversion between PSI, kPa, and Bar, with Bar values adjusted to 0.05 increments for standard air pumps.

Tire Label Comparison (EU, Japan, Taiwan) | Wet Grip, Fuel Efficiency Ratings & Pressure Conversion

Giti H2 Tire

Lookup Tire Labels

EU Standard: https://eprel.ec.europa.eu/screen/product/tyres
Japan Standard: https://kakaku.com/car_goods/tire/

Efficiency Calculators

Taiwan ARTC RRC Calculator

Before replacing your tires, I strongly recommend checking these databases. As long as the size, speed rating, and load index are identical, the tires are essentially the same product globally. I suggest avoiding tires that do not appear in the European or Japanese markets, or those with a Wet Grip rating below Grade A.

Unless the price difference is negligible, you don’t necessarily need to prioritize the fuel efficiency (Rolling Resistance) index, as it is often difficult to “break even” on the cost within the tire’s lifespan unless fuel prices skyrocket.
Recommended Priority: Wet Grip > Noise > Fuel Efficiency.

Wet Braking Distance Comparison: Differences across Wet Grip Grades

Wet Grip Ratings

Wet Grip (G-value)	EU Grade	Japan Grade	Taiwan Grade
1.55 ≤ G	A	a	-
1.40 ≤ G ≤ 1.54	B	b	-
1.25 ≤ G ≤ 1.39	C	c	-
1.10 ≤ G ≤ 1.24	D	d	-
G ≤ 1.09	E	-	-

Fuel Efficiency (Rolling Resistance) Ratings

Rolling Resistance	EU Grade	Japan Grade	Taiwan Grade
RRC ≤ 6.5	A	AAA	A
6.6 ≤ RRC ≤ 7.7	B	AA	B
7.8 ≤ RRC ≤ 9.0	C	A	C
9.1 ≤ RRC ≤ 10.5	D	B	-
RRC ≥ 10.6	E	C	-

Tire Pressure Conversion

Mercedes-Benz Pressure Chart (Source: Label A205 584 70 11)

Note: Bar values have been fine-tuned to 0.05 increments, making them applicable for manual air pumps without digital PSI displays.

PSI	kPa	Bar
31	210	2.10
32	220	2.20
33	230	2.30
34	-	2.35
35	240	2.40
36	250	2.50
37	-	2.55
38	260	2.60
39	270	2.70
40	-	2.75
41	280	2.80
42	290	2.90

Official Regulation Documents

EU Regulation (PDF): Regulation (EU) 2020/740
JATMA (Japan) Guidelines: JATMA Labeling Outline