WAN FENG INDUSTRIAL LIMITED.

TEL
:0532-86877906

FAX: 0532-86877906

EMAIL:
wanfengtire@hotmail.com

ADD:No.319 Changjiang east road, Qingdao economic development zone, Shandong, China.
TYRE LORE
 

Following traditional marking method, tyre size is represented by main technical parameters of tyre.


1. Radial Tyre
Radial tyre often uses the letter “R” as its code. R is the prefix of Radial, “-” is replaced by R to connect the two group figures. Such as 9.00R20、11R22.5, showed by inch; 185R15, the former figure is metric system, and the later is inch. Group Michelin use “X” as its code, such as 10.00-20X, 175-14X; the Soviet Union used “P” as its code, for example 155-13P,5.90-15P; Italy uses “Cinturato” as its code.
As the variety and size of tyre is increasing, the cross-section contour changes a lot. So the traditional marking method can’t get use to new demand. The marking method stipulated by the world is to use the width of tyre section (mm), tyre flat rate (%), structure code of tyre (such as R represents radial tyre) and symbol of rim diameter. For example 175/70SR14, the first group figure shows that the width of tyre section is 175 mm, the second group figure represents tyre flat rate is 70%, 70 tyre series, the third group figure 14 expresses rim diameter in inch. SR means fast radial tyre, and S means mark of speed range.


2. Tubeless Truck Tyre
After tubeless truck tyre switching to use deep slot rim, its rim diameter changed. For example, 8-22.5 ( equal to 7.50-20 inner tube base tyre), 10-22.5 (equal to 9.00-20 inner tube base tyre) in inch. Some tubeless truck tyre is directly marked “TUBELESS”.
While the size of specification number just shows the code of the tyre, not the real size. And the margin of two adjacent norms doesn’t exceed 10~ 15 %. 


3. Truck Tyre
According to the size, truck tyre and automobile tyre can be divided into mini, light, middle, and heavy size tyre. The signs of different style tyre are not the same.


(一) International standard tyre specification of ISO
According to international rule, the distance and introduction is,
255 / 70 R 22.5 140 /137 J
Which, 
255-nominal tyre cross section width, mm
70-tyre flat rate,%
R-sign of tyre structure, the structure of radial tyre
22.5-nominal rim diameter (tubeless tyre), in
140-single tyre load index, 24.5 KN
137-twins load index, 22.5 KN
J-sign of speed, 100km/h.


(二) Sign of British Standard


a. Mini Truck Tyre
It often refers to mini truck tyre, whose nominal cross section width is 4.50~5.00in, and nominal rim diameter is 10~12in. The tyre is installed on open or deep notch rim. For example:
5.00 - 12 ULT
Which,
5.00-nominal tyre cross section width, in
- - hyphen
12-nominal rim diameter, in
ULT-sign of reading material kinds of car (mini truck tyre)


b. Tyres of Light Truck, tractor and multi-purpose passenger cars
This kind of tyre is often installed on deep notch or half-deep notch tyre for road driving. Its rim diameter is below 16in, and tyre nominal cross section width is below 9.00in. For example:
8.25 - 16 LT
8.25-nominal tyre cross section width, in
--hyphen
16-nominal rim diameter, in
LT-sign of reading material kinds of car


c. Tyres of truck and autobus
It often refers to tyres of middle and heavy truck and bus, whose nominal rim diameter is 18~24in, nominal tyre cross section width is 7.5~14 in. This tyres are installed on I、II、III rim for road driving. For example, 9.00-20 diagonal tyre, 11.00R20.
Which,
9.00 - 20
9.00-nominal tyre cross section width, in
--hyphen
20-nominal rim diameter
11.00 R 20
11.00-nominal tyre cross section width, in
R-sign of radial tyre
20-nominal rim diameter

d. Tubeless Tyre
(1) As light truck’s demand, tubeless tyre is installed on deep notch rim. Its nominal rim diameter is larger than the same level rim, installed with inner tyre, 1.5 in, and its nominal tyre cross section width, except 6.50 in, is larger than the same level tyre which is equipped with inner tyre, 1 in. Meanwhile, it’s no need to add zero behind the size of section width. There is a list of the sign of tubeless tyre of light truck and corresponding one with inner tyre. 
7-17.5 6.50-16
8-17.5 7.00-16
8.5-17.5 7.50-16
10-17.5 9.00-16

(2) Tubeless Tyre of Truck
Its nominal rim diameter is larger than the same level rim, installed with inner tyre, 2.5 in, and its nominal tyre cross section width, except 7.50 in and 8.25 in, is larger than the same level tyre which is equipped with inner tyre, 1 in. Its section width is integer, and it’s no need to add zero behind the size of section width. There is a list of the sign of tubeless tyre of truck and autobus and corresponding one with inner tyre:
8-22.5 7.50-20
9-22.5 8.25-20
10-22.5 9.00-20
11-22.5 10.00-20
12-22.5 11.00-20
13-22.5 12.00-20


e. The Signs of other type Truck Tyres
Ml is the tyre of mining and forestry truck
HT is the tyre of heavy truck
MH is tyre of family travel car
ST is the tyre of highway trailer



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ADD:  No.319 Changjiang east road,
Qingdao economic development zone, 
Shandong, China.

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