Take off the hub. You should be able to see the bearing number on the edge of the track. If in doubt, knock them out and go to a bearing factor, who will match them for you. Every city has one.
Better if you can identify them yourself and buy on t'internet. Cheaper. It's pretty pointless buying quality bearings if you are dunking your trailer.
The track and the inner will have different numbers
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In this instance you want a 17831/17887.
Some bearing factors will sell bearings which are the same but with different numbers. They will have a conversion chart.
I have a 2002 SBS FK1800 trailer. I need some bearings for it but can't figure out the SBS site. Can someone identify the Al-Ko axle and hub type so I can source the bearings? I think you should be able to double click the photo for the detail.
View attachment 52426
Thanks in advance for any help.