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It's a PITA googling ISIS right now, but the ring on the axle is called a stop ring or stop collar. There should be one on each side, and the cranks should press against them. They are there to provide a precise axial position of the crank on the axle, which would otherwise be uncertain due to the crank banging into the spline run-out with varying degrees of pressure. If you assemble ISIS cranks without a stop collar, you can damage the crank.
gbj_tester
@guyfriday
This picture may have answered my question in advance but I'd like my mind set at ease by someone more experienced with this style of bottom bracket if possible.
I have just fitted an ISIS bottom bracket & crank on my track bike, BB threaded in fine, nice and tight etc..
However, the reverse of the chainring bolts rubbed a tiny bit when the chainring was fitted. the BB came with a spacer (just 1) on the non drive side which didn't seem to be doing much, the cranks were previously used, so the spacer could have come from either side, I added this to the drive side and now there is no rub with the chainring bolts along with a good chainline and the non drive side still has good clearance.
this picture seems to show a spacer that looks similar to the one in question on the drive side. So maybe thats where it was intended for but i would like some confirmation
Is it going to explode and kill me or will everything be just fine?
Thanks in advance