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Bit of help wanted as I'm sure other st4 owners on here must have come across this problem now we're a few years down the line...
My ST4 has developed some lateral movement in the rear triangle -seems to be coming from the main lower bearing. Do you think it is just a case of replacing the bushings and bearings or something more sinister?
If it is bushings/bearings can you buy them (no sign from a google search) and is it simple to just drift them out/in?
Not a ST4 owner so can't comment on how easy or difficult it would be to replace/renew the bearings and bushes but in general if there is play in the rear end of a full-sus it will probably be down to one and/or the other.
Shock eyelet bushes are easy to replace and relatively cheap - £2 a bush and £10-20 for a tool to replace them. As these are designed as wear items this is always a good starting point for diagnosing any problems.
If once the bushes are replace there is still movement then look to replace the suspension bearings. If you contact Orange they should be able to tell you the bearings required for the bike. There is generally a visible bearing number on the bearings in the frame, you may need to remove bolts and washers to get a good look at the bearing number. Use these numbers to find replacements.
If no numbers are visible and you can remove them then simply bearings has a bearing finder tool if you can put in the dimentions of the bearing.