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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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