I installed a new IRD freewheel on a bike today. When I rode the bike, I would notice a regularly periodic grinding/rubbing noise when I was freewheeling.

When I returned home, I eventually determined that the noise was coming from the freewheel. If you spin it with no pressure, it is fine, but if you turn it with some pressure, as would be done with the chain tension on it, there is a rough spot in the rotation, about 20-30 degrees of turning, always in the same spot.

When riding, I could clearly hear this, although it wasn't a horrendous racket. Sounds like tight bearings, although the hub body has a little play in it. I dripped some oil into it with no affect...

Has anyone else experienced this? It was enough to be worrisome and get my attention during riding, so I don't think I'm being super picky. I wrote back to Harris Cyclery about this, we'll see what they say, but I also wanted to see if anyone else had a similar experience.

The freewheel is/was a Mark III version, 13-24.