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| How do I measure a wheel rim? |
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The 'pcd' (pitch circle diameter) is the measurement you will always be asked for when enquiring about a wheel rim. |
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 |
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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 thye rim. This a number followed by a lettereg. 4½ J, 5 J, 5½ J etc....
3) The 'offset' is then another factor to consider, if Ais equal to B, it is a centre web rim, if Ais greater than B, the rim has an offset. |
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Disclaimer
The information in this guide is as accurate as the writer is able to make it, however, no responsibility can be accepted for any inaccuracies which may be in the text. It is the responsibility of any person wishing to depend on the facts to check for themselves with original documentation or any updating regulations, instruments or changes in the law. Interpretation of the law is a matter for the courts. |
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| Tony Maris. The writer has been Proprietor of Towbars & Trailers ( Chesterfield ) for over 20 years and lectures on Towbar Installations and Trailer Maintenance to members of the industry. His company was the first in the UK to be accredited to the NTTA's 'Quality Secured' standard. |
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Copyright 2001 Tony Maris. |
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