タイヤの規格

1. タイヤ規格委員会

(1) 目的

タイヤ技術の進歩に即応したタイヤ規格を作成することにより、国内外の標準化に協力するとともに、我が国のタイヤ技術の発展ならびに品質の向上に寄与する。

(3) 組織図

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2. JATMA規格

(1) JATMA YEAR BOOKとは

主として、国内で使用するタイヤの標準化・単純化・統一化を進めるための規格であり、その互換性を確保し、適正なタイヤの生産及び使用の合理化に寄与することを目的とする。

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(2) JATMA YEAR BOOK目次

  • G章 一般情報
  • A章 乗用車用タイヤ
  • B章 小形トラック用タイヤ
  • C章 トラック及びバス用タイヤ
  • D章 建設車両用タイヤ
  • E章 農業機械用タイヤ
  • F章 産業車両用タイヤ
  • M章 二輪自動車用タイヤ
  • S章 補足規格
  • R章 リムの輪郭
  • V章 タイヤバルブの種類

(3) タイヤの呼びの例

① 乗用車用タイヤの代表的な呼びの例

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ランフラットタイヤ (セルフサポートタイヤ) の場合、リム径の呼びの表示の前に文字「F」を表示する。

例) 245/40RF19 94Y, 245/40ZRF19 94Y

なお、エクステンディッドモビリティタイヤに関しては表示は変更しない。

例) 245/40R19 94Y, 245/40ZR19 94Y

ランフラットタイヤ及びエクステンディッドモビリティタイヤとはISO 16992に定められたものとし、その運用については道路運送車両の保安基準に基づく。

② 小形トラック用タイヤの代表的な呼びの例

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③ トラック及びバス用タイヤの代表的な呼びの例

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④ 二輪自動車用タイヤの代表的な呼びの例

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注(1) 使用条件特性を ( ) 付きで示す場合は、最高速度が ( ) 内に示す速度 

記号を超えることを示す。 例 (**W) : 最高速度270km/h超

(4) タイヤの諸元

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(5) Load Indexと負荷能力一覧表

LI: ロードインデックス
L I 負荷能力
kg
L I 負荷能力
kg
L I 負荷能力
kg
L I 負荷能力
kg
L I 負荷能力
kg
L I 負荷能力
kg
L I 負荷能力
kg
0 45 40 140 80 450 120 1400 160 4500 200 14000 240 45000
1 46.5 41 145 81 462 121 1450 161 4625 201 14500 241 46250
2 47.5 42 150 82 475 122 1500 162 4750 202 15000 242 47500
3 48.7 43 155 83 487 123 1550 163 4875 203 15500 243 48750
4 50 44 160 84 500 124 1600 164 5000 204 16000 244 50000
5 51.5 45 165 85 515 125 1650 165 5150 205 16500 245 51500
6 53 46 170 86 530 126 1700 166 5300 206 17000 246 53000
7 54.5 47 175 87 545 127 1750 167 5450 207 17500 247 54500
8 56 48 180 88 560 128 1800 168 5600 208 18000 248 56000
9 58 49 185 89 580 129 1850 169 5800 209 18500 249 58000
10 60 50 190 90 600 130 1900 170 6000 210 19000 250 60000
11 61.5 51 195 91 615 131 1950 171 6150 211 19500 251 61500
12 63 52 200 92 630 132 2000 172 6300 212 20000 252 63000
13 65 53 206 93 650 133 2060 173 6500 213 20600 253 65000
14 67 54 212 94 670 134 2120 174 6700 214 21200 254 67000
15 69 55 218 95 690 135 2180 175 6900 215 21800 255 69000
16 71 56 224 96 710 136 2240 176 7100 216 22400 256 71000
17 73 57 230 97 730 137 2300 177 7300 217 23000 257 73000
18 75 58 236 98 750 138 2360 178 7500 218 23600 258 75000
19 77.5 59 243 99 775 139 2430 179 7750 219 24300 259 77500
20 80 60 250 100 800 140 2500 180 8000 220 25000 260 80000
21 82.5 61 257 101 825 141 2575 181 8250 221 25750 261 82500
22 85 62 265 102 850 142 2650 182 8500 222 26500 262 85000
23 87.5 63 272 103 875 143 2725 183 8750 223 27250 263 87500
24 90 64 280 104 900 144 2800 184 9000 224 28000 264 90000
25 92.5 65 290 105 925 145 2900 185 9250 225 29000 265 92500
26 95 66 300 106 950 146 3000 186 9500 226 30000 266 95000
27 97.5 67 307 107 975 147 3075 187 9750 227 30750 267 97500
28 100 68 315 108 1000 148 3150 188 10000 228 31500 268 100000
29 103 69 325 109 1030 149 3250 189 10300 229 32500 269 103000
30 106 70 335 110 1060 150 3350 190 10600 230 33500 270 106000
31 109 71 345 111 1090 151 3450 191 10900 231 34500 271 109000
32 112 72 355 112 1120 152 3550 192 11200 232 35500 272 112000
33 115 73 365 113 1150 153 3650 193 11500 233 36500 273 115000
34 118 74 375 114 1180 154 3750 194 11800 234 37500 274 118000
35 121 75 387 115 1215 155 3875 195 12150 235 38750 275 121500
36 125 76 400 116 1250 156 4000 196 12500 236 40000 276 125000
37 128 77 412 117 1285 157 4125 197 12850 237 41250 277 128500
38 132 78 425 118 1320 158 4250 198 13200 238 42500 278 132000
39 136 79 437 119 1360 159 4375 199 13600 239 43750 279 136000

備考 荷重 (kN) =負荷能力 (kg) ×9.80665×10-3 (m/s2

(6) 速度記号

速 度 記 号 速 度 km/h 速 度 記 号 速 度 km/h
A1 5 K 110
A2 10 L 120
A3 15 M 130
A4 20 N 140
A5 25 P 150
A6 30 Q 160
A7 35 R 170
A8 40 S 180
B 50 T 190
C 60 U 200
D 65 H 210
E 70 V 240
F 80 W 270
G 90 Y 300
J 100

(7) EXTRA LOAD又はREINFORCEDとは

通常のタイヤが通常の空気圧で負荷することを許された質量よりも、高い空気圧でより大きい質量を負荷できるように設計されたタイヤをいう。

3. ISO規格

(1) タイヤISO規格へのJATMAの関与

ISO(International Organization for Standardization:国際標準化機構)とは、スイスのジュネーブに本部を置く非営利団体である。電気・電子及び電気通信を除くあらゆる分野の工業規格の策定を行う世界最大の国際標準化機関で、各国の代表的標準化機関から構成され、「国家間の製品やサービスの交換を助けるために、標準化活動の発展を促進すること」「知的、科学的、技術的、そして経済的活動における国家間協力を発展させること」を目的に活動される。

我が国の経済を支える基幹産業とも言える自動車は国際的な流通商品となっており、また、それに装着される自動車用タイヤについても国際的な標準規格の策定が望まれている。

ISOでは分野ごとに専門委員会(Techinical Comittee:TC)が設置されており、タイヤの国際規格はその専門委員会の一つであるタイヤ、リム及びタイヤバルブ専門委員会(ISO/TC31)において策定されいる。JATMAはISOのmember body(加盟団体)であるJISC(Japanese Industrial Standards Committee:日本産業標準調査会)よりISO/TC31の国内審議団体として承認され、これに臨んでいる。

(2) ISO/TC31構成

TC : Technical Committee
SC : Sub Committee
AHG: Ad Hoc Group
WG : Working Group
TC SC WG Name
TC31 Tyres, rims and valves
AHG01 Tyre noise test exchange
AHG02 ISO/TC 31 Scope revision
1 Terminology
6 Rolling resistance (highway tyres)
8 Methods for measuring snow and ice grip performance
9 Pneumatic tubes and flaps for automobile vehicles
10 RFID tyre tags
11 Tyre noise test methods
12 Methods for measuring relative wet grip performance
SC3 Passenger car tyres and rims
6 Profiles and dimensions of passenger car rims
15 Relationship between load/pressure and other parameters
19 Runflat tyre system capabilities
SC4 Truck and bus tyres and rims
SC5 Agricultural tyres and rims
SC6 Off-the-road tyres and rims
8 Performance Capacity of earth-mover tyres (TKPH Drum test)
9 Rims for earth-mover tyres
10 Consistency of document ISO 4250-1/-2 and -3
SC7 Industrial tyres and rims
2 Tyres on 15 degrees drop centre rims
4 Tyres for rim diameter code 16 and larger
6 Cylindrical and conical base rubber solid tyres
SC8 Aircraft tyres and rims
SC9 Valves for tube and tubeless tyres
SC10 Cycle, moped, motorcycle tyres and rims
16 Tyre designations and dimensions for Bicycle tyres and rims
17 Motorcycle tyres and rims (metric series)

(3) ISO/TC31規格一覧

No Title
TC31
ISO 3877-1 :1997 Tyres, valves and tubes -- List of equivalent terms -- Part 1: Tyres
ISO 3877-2 :1997 Tyres, valves and tubes -- List of equivalent terms -- Part 2: Tyre valves
ISO 3877-3 :1978 Tyres, valves and tubes -- List of equivalent terms -- Part 3: Tubes
ISO 3877-4 :1984 Tyres, valves and tubes -- List of equivalent terms -- Part 4: Solid tyres
ISO 4223-1 :2017 Definitions of some terms used in the tyre industry -- Part 1: Pneumatic tyres
ISO 4223-2 :1991 Definitions of some terms used in the tyre industry -- Part 2: Solid tyres
ISO 13325 :2019 Tyres -- Coast-by methods for measurement of tyre-to-road sound emission
ISO 13326 :1998 Test methods for measuring tyre uniformity
ISO 15222 :2011 Truck and bus tyres -- Method for measuring relative wet grip performance -- Loaded new tyres
ISO/TR 16377 :2012 Further clarification of ISO 28580
ISO 16392 :2017 Tyres -- Electrical resistance -- Test method for measuring electrical resistance of tyres on a test rig
ISO 17464 :2016 Pneumatic tubes for automotive vehicles -- Technical requirements and test methods
ISO 18106 :2016 Passenger car, commercial vehicle, truck and bus tyres -- Methods for measuring snow grip performance -- Loaded new tyres
ISO 18164 :2005 Passenger car, truck, bus and motorcycle tyres -- Methods of measuring rolling resistance
ISO 20909 :2019 Radio frequency identification (RFID) tyre tags
ISO 20910 :2019 Coding for radio frequency identification (RFID) tyre tags
ISO 20911 :2020 Radio frequency identification (RFID) tyre tags -- Tyre attachment classsification
ISO 20912 :2020 Conformance test methods for RFID enabled tyres
ISO 23671 :2015 Passenger car tyres -- Method for measuring relative wet grip performance -- Loaded new tyres
ISO 28580 :2018 Passenger car, truck and bus tyre rolling resistance measurement method -- Single point test and correlation of measurement results
ISO/TR 29846 :2008 Tyres, valves and tubes -- kPa/psi equivalencies for inflation pressures
SC3
ISO 4000-1 :2015 Passenger car tyres and rims -- Part 1: Tyres (metric series)
ISO 4000-2 :2013 Passenger car tyres and rims -- Part 2: Rims
ISO 10191 :2010 Passenger car tyres -- Verifying tyre capabilities -- Laboratory test methods
ISO 16992 :2018 Passenger car tyres -- Spare unit substitutive equipment (SUSE)
ISO 17269 :2000 Passenger car tyres -- Methods for measuring rolling circumference -- Loaded new tyres
ISO 19940 :2017 Tyre stiffness index testing procedure for passenger car extended mobility and run flat tyres
SC4
ISO 4209-1 :2001 Truck and bus tyres and rims (metric series) -- Part 1: Tyres
ISO 4209-2 :2012 Truck and bus tyres and rims (metric series) -- Part 2: Rims
ISO 9112 :2008 Truck and bus tyres -- Methods of measuring tyre rolling circumference -- Loaded new tyres
ISO 10454 :1993 Truck and bus tyres -- Verifying tyre capabilities -- Laboratory test methods
SC5
ISO 4251-1 :2019 Code designated diagonal tyres (ply rating marked series) for agricultural tractors, trailers and machines -- Part 1: Tyre designation and dimensions, and approved rim contours
ISO 4251-2 :2019 Code designated diagonal tyres (ply rating marked series) for agricultural tractors, trailers and machines -- Part 2: Tyre load ratings
ISO 7867-1 :2018 Metric series for agricultural, forestry machines and construction tyres -- Part 1: Tyre designation, dimensions and marking, and tyre/rim coordination
ISO 7867-2 :2018 Metric series for agricultural, forestry machines and construction tyres -- Part 2: Load ratings for agricultural tyres
ISO 8664 :2018 Tyres for agricultural tractors and machines -- Code-designated and service-description marked radial drive-wheel tyres
ISO 11795 :2018 Agricultural tractor drive wheel tyres -- Explanation of rolling circumference index (RCI) and speed radius index (SRI) and method of measuring tyre rolling circumference
ISO 18804 :2017 Rims for agricultural, forestry and construction machines
ISO 18805 :2017 Tyre classification -- Agricultural, forestry and construction machines
ISO 18807 :2019 Tyres and rims for logging and forestry service
SC6
ISO 4250-1 :2017 Earth-mover tyres and rims -- Part 1: Tyre designation and dimensions
ISO 4250-2 :2017 Earth-mover tyres and rims -- Part 2: Loads and inflation pressures
ISO 4250-3 :2011 Earth-mover tyres and rims -- Part 3: Rims
ISO 10571 :2016 Tyres for mobile cranes and similar specialized machines
ISO 13442 :2004 Tyres and rims for construction machines
SC7
ISO 3739-1 :2007 Industrial tyres and rims -- Part 1: Pneumatic tyres (metric series) on 5 degrees tapered or flat base rims -- Designation, dimensions and marking
ISO 3739-2 :1992 Industrial tyres and rims -- Part 2: Pneumatic tyres (metric series) on 5 degrees tapered or flat base rims -- Load ratings
ISO 3739-3 :2008 Industrial tyres and rims -- Part 3: Rims
ISO 10499-1 :2019 ndustrial tyres and rims -- Rubber solid tyres (metric series) for pneumatic tyre rims -- Part 1: Designation, dimensions and marking
ISO 10499-2 :1998 Industrial tyres and rims -- Rubber solid tyres (metric series) for pneumatic tyre rims -- Part 2: Load ratings
ISO 10500 :1991 Industrial tyres and rims -- Cylindrical and conical base rubber solid tyres (metric series) -- Designation, dimensions and marking
SC8
ISO 3324-1 :2013 Aircraft tyres and rims -- Part 1: Specifications
ISO 3324-2 :2013 Aircraft tyres and rims -- Part 2: Test methods for tyres
SC9
ISO 4570 :2002 Tyre valve threads
ISO 7295 :1988 Tyre valves for aircraft -- Interchangeability dimensions
ISO 7295 :1988/Amd 1 :2014 ISO 7295:1988/Amd 1:2014
ISO 9413 :2012 Tyre valves -- Dimensions and designation
ISO 9413 :2012/Amd 1 :2012 ISO 9413:2012/Amd 1:2012
ISO 9475 :1994 Aircraft inner tube and tubeless tyre valves -- Cores and caps -- Test methods
ISO 14960-1 :2014 Tubeless tyres -- Valves and components -- Part 1: Test methods
ISO 14960-2 :2014 Tubeless tyres -- Valves and components -- Part 2: Clamp-in tubeless tyre valve-test method
ISO 18885-1 :2017 TPMS snap-in valves -- Part 1: Identification
ISO 18885-2 :2018 TPMS snap-in valves -- Part 2: Valve environment
ISO 18885-3 :2019 TPMS snap-in valves -- Part 3: Performance
ISO 20562 :2014 Tyre valves -- ISO core chambers No. 1, No. 2, No. 3 and No. 4
SC10
ISO 4249-1 :1985 Motorcycle tyres and rims (Code designated series) -- Part 1: Tyres
ISO 4249-2 :1990 Motorcycle tyres and rims (Code-designated series) -- Part 2: Tyre load ratings
ISO 4249-3 :2010 Motorcycle tyres and rims (code-designated series) -- Part 3: Rims
ISO 5751-1 :2010 Motorcycle tyres and rims (metric series) -- Part 1: Design guides
ISO 5751-2 :2010 Motorcycle tyres and rims (metric series) -- Part 2: Tyre dimensions and load-carrying capacities
ISO 5751-3 :2010 Motorcycle tyres and rims (metric series) -- Part 3: Range of approved rim contours
ISO 5775-1 :2014 Bicycle tyres and rims -- Part 1: Tyre designations and dimensions
ISO 5775-2 :2015 Bicycle tyres and rims -- Part 2: Rims
ISO 6054-1 :1994 Motorcycle tyres and rims (code-designated series) -- Diameter codes 4 to 12 -- Part 1: Tyres
ISO 6054-2 :1990 Motorcycle tyres and rims (Code-designated series) -- Diameter codes 4 to 12 -- Part 2: Rims
ISO 10231 :2003 Motorcycle tyres -- Test methods for verifying tyre capabilities
ISO-10231 :2003/Amd 1 :2015 ISO 10231:2003/Amd 1:2015
ISO 13328 :2000 Motorcycle tyres -- Measurement of tyre rolling circumference -- Loaded new tyres
ISO 29802 :2017 All-terrain (AT) tyres and rims -- Symbol marked pneumatic tyres on 5 degree tapered rims -- Designation, dimension, marking and load ratings