Technical Information
Hub fitting wheels and rim terms
Hub fitting wheels have a bore and a number of stud holes to suit the
hub to which it is being attached. When fitting the wheeks to the hub,
it is very important to tighten at the correct torque in order to prevent
nuts from working loose. It is also important to check after a short
period of use and on a regular basis thereafter. The correct nut must
be used to suit the wheel seating eg. conical or spherical.
G
A = Bore (mm)
B = Pitch circle Diameter (PCD) mm
BD= Back depth (mm)
ET = Offset (mm)
E = stud hole diameter (mm)
F = Rim diameter (Inches)
G = Rim width (Inches)
F B A
E
ET
Common Stud Patterns
NO. STUDS
PCD INCHES
PCD METRIC
STUD TO STUD
TYPE
4
4"
101.6mm
71.84mm
Mini
4
4¼"
108mm
76.33mm
Escort/Cortina
4
4½"
114.3mm
80.82mm
Most Japanese
4
4¾"
120.65mm
85.31mm
5
4¼"
108mm
63.45mm
HT Holden
5
4½"
114.3mm
67.18mm
Falcon/Toyota
5
4¾"
120.65mm
70.92mm
Holden HQ
5
5"
127.00mm
74.65mm
Delta Alloy
140mm
82.29mm
Ag
139.7mm
69.85mm
Landcruiser
5
6
5½"
measurement
•
•
•
•
4 stud multiply stud to stud by 1.4 142 for PCD
5 stud multiply stud to stud measurement by 1.7013 for PCD
6 stud multiply stud to stud measurement by 2.00 for PCD
Treadway have a PCD measuring tools, item No. 99974
Wheel and Tyre solutions since 1975
0800 653 246
treadway.co.nz
[email protected]
Technical Information
tyre size designations
How to read a tyre (300-4)
260mm
Dimension
Explaination
300-4
Tyre width 3.00” / Rim Diameter 4"
10x3
Former designation in inches:
Tyre Width 3” / Tyre diameter 10” ( =3” x 2 + 4”)
260x85
Designation in millimetres:
Tyre diameter 260mm / Tyre width 85mm
The former designation in inches converted to mm:
10” x 25.4 = approx. 260mm
3” x 25.4 = approx. 85mm
85/100-4
This is how the designation would be, had it been a passenger car tyre.
Tyre width 85mm / Profile 100% / Rim diameter 4”.
10x3.00-4
American designation, mainly used for low proflie and turf tyres:
Tyre Diameter 10” / Tyre Width 3” / Rim diameter 4”
Conversion Tyre Dimension
85mm
Common tyre conversions for small
tyres used in the following sectors.
* Handtrucks and internal transport
* Mobility and wheelchairs
* Tyres for ride on Mowers
* Tyres for Hay equipment
180x45
7x1¾
200x35
8x1¼
200x50
8x2
220x50
8½x2
2.50-3
210x65
8x2.5
3.00-4
260x85
10x3
4.00-4
300x100
12x4
4.00-5
330x100
2.00-6
10x2
3.50-6
13x3
4.00-6
14x4
2.25-8
12½x2¼
4.00-8
Wheel and Tyre solutions since 1975
400x100
16x4
5.00-8
18x5
6.00-9
21x6
16x650-8
170/60-8
16.5x6.5-8
165/65-8
18x8.50-8
210/60-8
18.5x8.5-8
215/60-8
18x8.00-10
195/50-10
20.5x8.00-10
205/65-10
24x8.00-14.5
200/60-14.5
0800 653 246
treadway.co.nz
[email protected]
Technical Information
OFFSET
The offset (ET) is the distance from the centre-line to the back side of
the wheel disc (Where the wheel is fitted to the hub). The off set can
be positive (+) or negative (-). A positive offset results in a narrower
track width, i.e. Brings the wheel closer to the machine body. A
negative offset will result in a wider track width, thus taking the wheel
further away from the machine body. The following drawings illustrate
positive and negative offsets.
+
-
Pressure conversion chart
Conversion – Inflation Pressure
Conversion – Inflation Pressure
Conversion – Inflation Pressure
kPa
bar
kg/cm2
psi
kPa
bar
kg/cm2
psi
kPa
bar
kg/cm2
psi
10
0.1
0.1
1
150
1.5
1.5
22
290
2.9
3
42
20
0.2
0.2
3
160
1.6
1.6
23
300
3
3.1
43
30
0.3
0.3
4
170
1.7
1.7
25
320
3.2
3.3
46
40
0.4
0.4
6
180
1.8
1.8
26
340
3.4
3.5
49
50
0.5
0.5
7
190
1.9
1.9
28
360
3.6
3.7
52
60
0.6
0.6
9
200
2
2
29
380
3.8
3.9
55
70
0.7
0.7
10
210
2.1
2.1
30
400
4
4.1
58
80
0.8
0.8
12
220
2.2
2.2
32
450
4.5
4.6
65
90
0.9
0.9
13
230
2.3
2.3
33
500
5
5.1
72
100
1
1
14
240
2.4
2.4
35
600
6
6.1
87
110
1.1
1.1
16
250
2.5
2.6
36
700
7
7.1
101
120
1.2
1.2
17
260
2.6
2.7
38
800
8
8.2
116
130
1.3
1.3
19
270
2.7
2.8
39
900
9
9.2
130
140
1.4
1.4
20
280
2.8
2.9
41
1000
10
10.2
145
Convesion psi = kpa ÷ 6.895 | kpa = psi x 6.895 | bar = kpa ÷ 100
Wheel and Tyre solutions since 1975
0800 653 246
treadway.co.nz
[email protected]
Technical Information
Load and speed ratings
speed symbol conversion chart
On the sidewall of a tyre you can find the load index and Speed
Symbol following the key sidewall size markings.
Speed Index
•
The Load Index is a numerical code associated with the
maximum load a tyre can carry.
•
The Speed Symbol indicates the speed at which the tyre can
carry a load corresponding to its load index
ply rating
Originally tyres were marked with the exact number of canvas layers (plies)
built into the tyre. This was an indication of the strength of the tyre. As
stronger materials were developed, the number of layers could be reduced
- maintaining the same strength of the tyre. The designation “Ply Rating”
therefore does not indicate the actual number of layers (plies) in the tyre,
but the number of layers originally required to give the desired load capacity.
When working with PR marked tyres, the actual manufacturers data must
be used to determine the load capacity in kg (or pounds). This lead to a new
distinction. Load Range as shown below.
Ply rating / Load Equivalance
Load Range
A
B
C
D
E
F
Ply Rating
2
4
6
8
10
12
Speed Index
SI
km/h
mph
SI
km/h
mph
A1
5
3
G
90
56
A2
10
6
J
100
63
A3
15
9
K
110
69
A4
20
13
L
120
75
A5
25
16
M
130
81
A6
30
19
N
140
88
A7
35
22
P
150
94
A8
40
25
Q
160
100
B
50
31
R
170
106
C
60
38
S
180
113
D
65
41
T
190
118
E
70
44
H
210
130
F
80
50
load index conversion chart
Load Index
Load Index
Load Index
Load Index
Load Index
Load Index
LI
kg
lb
LI
kg
lb
LI
kg
lb
LI
kg
lb
LI
kg
lb
LI
kg
lb
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
45
46.2
47.5
48.7
50
51.5
53
54.5
56
58
60
61.5
63
65
67
69
71
73
75
77.5
80
82.5
85
87.5
90
92.5
95
97.5
99
102
105
107
110
113
117
120
123
128
132
135
139
143
147
152
156
161
165
171
176
182
187
193
198
204
209
215
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
100
103
106
109
112
115
118
121
125
128
132
136
140
145
150
155
160
165
170
175
180
185
190
195
200
206
212
218
220
227
233
240
246
253
260
266
275
282
290
299
308
319
330
341
352
363
374
385
396
407
418
429
440
453
466
480
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
224
230
236
243
250
257
265
272
280
290
300
307
315
325
335
345
355
365
375
387
400
412
425
437
450
462
475
487
493
506
519
535
550
565
583
598
616
638
660
675
693
715
737
759
781
803
825
851
880
906
935
961
990
1016
1045
1071
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
500
515
530
545
560
580
600
615
630
650
670
690
710
730
750
775
800
825
850
875
900
925
950
975
1000
1030
1060
1090
1100
1133
1166
1199
1232
1276
1320
1353
1386
1430
1474
1518
1562
1606
1650
1705
1760
1815
1870
1925
1980
2035
2090
2145
2200
2266
2332
2398
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
1120
1150
1180
1210
1250
1280
1320
1360
1400
1450
1500
1550
1600
1650
1700
1750
1800
1850
1900
1950
2000
2060
2120
2180
2240
2300
2360
2430
2464
2530
2596
2662
2750
2816
2904
2992
3080
3190
3300
3410
3520
3630
3740
3850
3960
4070
4180
4290
4400
4532
4664
4796
4928
5060
5192
5346
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
2500
2570
2650
2720
2800
2900
3000
3070
3150
3250
3350
3450
3550
3650
3750
3870
4000
4120
4250
4370
4500
4620
4750
4870
5000
5150
5300
5450
5500
5654
5830
5984
6160
6380
6600
6754
6930
7150
7370
7590
7810
8030
8250
8514
8800
9064
9350
9614
9900
10164
10450
10714
11000
11330
11660
11990
Wheel and Tyre solutions since 1975
0800 653 246
treadway.co.nz
[email protected]