Tim,

How accurately did you measure the shaft and bushes? None of those sizes (as you state) seem to correlate with standard flanged oilite bushes. So two possibilities, one is your measurements are off or two the manufacturer of the trainer used odd size bushings. The latter makes little sense in terms of cost – making their own bushes to odd sizes adds cost and complexity to their product, however they may have altered the length and OD of a standard product to suit the other materials they were using (although 15.4mm bore makes little sense either) so maybe it was the former! If so the lack of suitable off the shelf replacements protects their product in some ways by ensuring if you want parts you can only source them from them, or it guarantees obselesence and forces you to buy a new trainer? Probably the only way to match those sizes if your measurement is accurate is to make your own!

Paul.

Looks like a 5/8" x 15/16" x 11/16" long bushing to me.

Edit: Looks like you have taken the flange OD as your OD size. If so, it should be OD of the bush itself.

It looks like the part number is made up from the relevant sizes in sixteenths of an inch.

Edited By Pete Rimmer on 03/09/2021 07:11:55

I would be very tempted to knock up a couple of bushings from Delrin or PTFE.