I am changing all the wheel bearings on my series 3 1980, how do I know if they are imperial or metric, the old bearings are SKF and are marked.
I have been told this is the year when they changed from imperial to metric.
if they are the later bearings they will both be the same size ,(rtc3429)earlier bearings were 2 different sizes (rtc3416 and rtc3426)
All you need are the numbers off your old ones to order like for like ... And fit Timkens!