The 'pcd' (pitch circle diameter) is the measurement you will always be asked for when enquiring about a wheel rim.
Number of Rim Studs
3 Stud Rim
Measure C, this is the distance from the centre of a stud to the edge of the hub The 'pcd' (pitch circle diameter) is the measurement you will always be asked for when enquiring about a wheel rim.
Number of Rim Studs
3 Stud Rim Measure C, this is the distance from the centre of a stud to the edge of the hub centre. Measure D, this is the hub centre diameter. pcd = (C x 2) + D
4 Stud Rim Measure across the centre hub from the centre of one stud to another, this is the 'pcd'
5 Stud Rim Measure C, this is the distance from the centre of a stud to the edge of the hub centre. Measure D, this is the hub centre diameter. pcd = (C x 2) +D
The other measurements needed will be:-
1) The wheel rim diameter, this can be obtained from the information on the tyre eg. 520x 10, 175x13, 650x16, etc...
2) The wheel section, this is normally stamped in the rim. This a number followed by a letter eg. 4½ J, 5 J, 5½ J etc....
3) The 'offset' is then another factor to consider, if A is equal to B, it is a centre web rim, if A is greater than B, the rim has an offset.centre. Measure D, this is the hub centre diameter. pcd = (C x 2) + D
4 Stud Rim Measure across the centre hub from the centre of one stud to another, this is the 'pcd'
5 Stud Rim Measure C, this is the distance from the centre of a stud to the edge of the hub centre. Measure D, this is the hub centre diameter. pcd = (C x 2) +D
The other measurements needed will be:-
1) The wheel rim diameter, this can be obtained from the information on the tyre
eg. 520x 10, 175x13, 650x16, etc...
2) The wheel section, this is normally stamped in the rim. This a number followed by a letter eg. 4½ J, 5 J, 5½ J etc....
3) The 'offset' is then another factor to consider, if A is equal to B, it is a centre web rim, if A is greater than B, the rim has an offset.