Hi. I have some play at the top of my headset so I’m hoping a new bearing in there will fix it. It’s a Nukeproof Warhead 44IESS and I think I’ve found the correct bearing type on CRC:

http://www.chainreactioncycles.com/nukeproof-warhead-ac-cartridge-bearing-2013/rp-prod92342

There are 2 different options though and I don’t know what it all means. One is 36/45 x 51.8 and the other is 45/45 x 41.0. What do these numbers mean and how do I know what one I need for my headset?

Thanks in advance.

Anyone?

I think the 41.0 and 51.8 numbers are the outside diameters of the bearings. You can easily measure those and determine which sizes you need?

OK ta.

The 36/45 x 51.8 will probably be the bottom cup bearing and the 45/45 x 41.0 will be the smaller top cup bearing.

Just pop the current bearing out and there should be some numbers printed on them.