Sizing up headset bearings.......

bagz3
bagz3 Posts: 253
edited August 2015 in Workshop
Had my headset out today and noticed the bottom set of bearings are feeling slightly worn, so I'm going to replace them.

It says on the bearings "TH MR127.5 1.5 36x45"

My question is, what does this mean and what part of this is relevant to the size etc

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