Are all lockrings 24 tpi?
 

I have alex solo rims. I just purchased a surly cog and a shimano lock ring for me fixie. The cog spun on fine and I tightened it. I trying putting on the lockring (threading CCW) and it goes in a couple of lines and then just stops. It appears stuck and I don't wanna force it because the rims are aluminum and I'm gonna strip the threads. Anysuggestions??

did you grease the lockring? check the threads for burrs or debris?

THx!!! Found some crap where I wasn't looking. Cleaned the thread and it went in. Mucho appreciated.:)

mavic ellipse hubs take special (french?) threaded lockrings...I managed to tighten a soma (english) lockring on one side of my ellipse wheel - it was hard. I have since removed it and use the other "good" side for now; not sure if I can use the other side now or not.